.

P A R T A

3

S E R I E S L A k 0 0

L A 4 0 0

L A P 4 o o

L A L 4 0 0

L A 4 9 0

L A P 4 9 0

s - E R v I c E D E P A R T 1.1 E N T

M A N U E1 D' ATELIER - ~

WORKSHOP MANUAL

I - S P E C I F I C A T I O N S I

ENGINES

LA 400 LAP 490

WA.IN ENGINE S P E C I F I C A T I O N S

S e r i e s Engine Bore S t roke D i s p . Metric HP RPM M a x . Torque Fuel U t . Mm. Ph. Cu.Cm. DIN Std. Icgm. /RPM I(gs. i - - --

LA 400 80 80 402 10 3000 2.7/2100 G a s . 48

LA 400 80 80 402 10 30% 2.7/2100 G a s . 48

LA400 LAP400 80 80 402 8.3 3000 2.3/2300 K e r . 48

3000 2.3/2300 K e r . 48

LAL400 80 80 402 6.5 22M3 2.3/1750 G a s . 48

sn

LAP400 80 80 402 8.3 sn

LA 490 88 80 487 12 3000 3.3/1800 G a s . 48

LA 490 88 80 487 12 3000 3.3/1800 G a s . 48

LAP490 88 80 487 10 3000 2.7/2300 K e r . 48

LA23490 88 80 487 10 3000 2.:/2300 Ker. 48

i LA49 0 sn

sn

N.B. Engines marlad 'fsn" have a n t i c l o c k r u i s e r o t a t i o n , l o o k i n g a t f lyrihe e1 . U n l e s s o themise indicated, engine repair ing ins t ruc t ions apply t o a l1 m o d e l s .

3

MANUEL ~~ D'ATELIER series~ LAA& 2 WORKSHOP MANUAL

I1 - M A I N T E N A N C E S C H E D U L E

OPEUTION ITEM INTERVAL BASIS: DAILY - IIRS. AIR

FUEL FILTEB

CLEANING CRANKCASE BREATHER BEAD AND CYLINDER FINS' FUEL TANK SPARX PLUG

AIR CLEANER SUb!P+++

OIL LEVEL

CHECICING VALVES CLEARANCE BREAImR CONTACTS CLEARANCE AIR CLEANER GASIW

AIR CLEANER++ OIL

REPLACEMENT SUMP'"

SPARK PLUG

++++ PARTIAL GENERAL

OVERHAUL

+Under particularly severe operating conditions, every day. ++Under extremely dusty conditions, every 4/5 hours. +++Use Grade SAE 20 i{ Oil below IOOC; SAE 30 f r o n i 10°C. to 30°C.

) and SAE 50 above 30°C. '+++Includes : checlcing of cylinder, rings, valves, guides, springs

- valve seats grinding - replacement of brealcer contacts.

CAPACITIES

Standard fuel tank, liters: Type LA - LAL 400/490 Type LAP 400/490

Gasoline ICero sene 6.0

,- 0.4 5 - 6

O i l sump, liters: 1,25 A i r cleaner oil b o w l t liters:

"For special air cleaners stick to Lornbardini's instructions.

0.06

4

MANUEL D'ATELIER Ceri-es LA 400- ~

WORKSHOP MANUAL

1 1 1 - D I S A S S E M B L Y I N S T R U C T I O N S \

ENGINE INSTALLATION

B o l t engine t o s t a n d from exhaust s i d e .

D I SASSEMBLING

Disassemble a c c e s s o r i e s and e x t e r n a l par ts . To avoid any damage, c a r r y o u t d i sassembl ing job r v i t b folio.rving s p e c i a l t o o l s :

Fig. 1 - P u l l e r R70.3595.26 f o r f lywheel .

Gear t ra in housing can b e disassembled wi thou t removing c y l i n d e r head. In this c a s e p fu l ly loosen roclcer a r m a d j u s t i n g serews b e f o r e d isassembl ing housing t o p reven t deforming pro$eipt ion. tube of pnsh

C r a n l c s h a f t u i u s t b e pulled out; complete with ball. bea-ring o n I l y - wheel s i d e , proceding as f o l i o r i s :

- remove 'ball b e a r i n g r e t a i n s r from i n s i d e (Fi,

MANU E1 D'ATELIER ~ Ceries-LA-400

WORKSHOP M A N U A L

IV-O V E R H A U L C H E C I< S A N D S P E C I F I C A T I 0 N S \

CYLINDER HEAD Do n o t remove c y l i n d e r head when h o t , as this m i g h t cause deforma- t i o n s . Descale carbon d e p o s i t s from combustion chaniber. Checlc that c y l i n - de r head m a t i n g f a c e i s n o t o u t of shape. S l i g h t deformat ions can b e e l i m i n a t e d w i t h a s c r a n e r . Otherwise. l a m - - away as m u c h as 0.5 mm. up t o t h e l i m i t of 13.4 mm. combustion cham- ber dep th (F in . 7 ) . . - Cyl inde r head o f - l b g i n e s LA 400 and LA 490 a r e n o t i n t e r c h a n g e a b l e . Fig. 7 - Checlcing d e p t h of coinbustion chamber. 'VALVES - GUIDES - SEATS Remove carbon d e p o s i t s from v a l v e head . Maice c e r t a i n t h e r e i s per - f e c t tightness between s e a t and v a l v e by checlcing m a t i n g f a c e s . If s e a t s show traces o f c o r r o s i o n or l ight cracks , g r i n d t h e m with a norma1 450 c u t t e r anci g r i n d v a i v e s . c u t t e r s a d s e a t s dimensioiis

Lap v a l v e s i n s e a t with f i n e grinding compound. If v a l v e heads sliow e x c e s s i v e no tches or grooves, r e p l a c e -them. If s e a t c u t t i n g causes t o o much sinliing of t h e 'Cioad a n c l i f s e a t m a t i n g f a c e Tiidth (Il i n Fig. 9 ) exceeds 2.5 m m , , r a p i a c a s e a t as f o l lows :

- With a 2/3 mm. t i p d r i l l a few h o l e s i n some s p o t of .thc s e a t and - Pull ou t s e a t ; - Heat head i n oven t o 76Oo/16O0C.; - Asszmble s e a t and se+ i t w i t h . a b u f f e r or used v a l v e ; - G r i n d s e a t and lap v a l v e . ife recommeiid having this job done by a s p e c i a l i z e d grindiiig shoi). M t e r mountizg v a l v e s checlc that d i s t a n c e S ( F i g . 9) bctween cy l - i n d e r head s u r f a c e and v a l v z head i s 1.5/2.5 mm. Fig . 6 - Diinension of c u t t e r s and v a l v e s e a t s .

i a r e i n Table o f F i g . 6.

cut t l irough wvth a c h i s e l x i t h o u t ciamaging housii ig j

Engine Valve Dimensions : mm . ! A B C

intalce 4.1 35 6 Exhaust 35 29 1 0 LA 400

Intalce 41 39 E Exhaust 35 3.1 10 LA 490

Valves and s e a t s check, mm: New Dimensions Wear Limi t s

Intalce Exhaust intalce Exhaust Ref e rence

Diameter gu ide A 8.03/6.05 10.03/10.05 o. 1 Diameter stem B 7.96/9.00 9.96/10.00 (play) Thiclaless C 1.041.1 0.6 Mating f a c e D 1.4/1.6 2 . 5 P r o t r u s i o n S 1 - 5 b . 5 0.5

F i g . 9 - Dimensions of v a l v e s , s e a t s and g u i d e s . 7

Series LA 400 -_ __ MANUEL D'ATELIER ~~~

WORKSHOP MANUAL

i Valves of Engines L4 400 a r e dif ierent f r o m valves of Engines LA 490 only i n the diameter o f t h e i r heads. Be sure that inside o f guides i s f ree f r o m grooves, seizure t races or carbon deposits. C l e a n rvith wire brush and gasoline.

Checlc tha t clearance between s t e m and guide does n o t exceed 0.15 mm. (Fig. I O ) .

Fig. 10 - Checlciiig clearance between stem and guides. Otherwise, replace guide with one having ai oversize O.D. Of 0 .5 min. Procede as f o l l o w s :

- Remove guide with a punch from valve seat s ide ; - D u r e seat i n liead t o the d ia ine t e r o f 14.47/14.49 nim.; - Heat head i n oven or o i l t o 1 6 O o / 1 8 O 0 C . ; - iiith punch d r ive i n new guide f i t t e d with retaining snap r ing

A f t e r replacing guides, grind seats and l a p valvos. Fig. 11 - Mounting valve guide.

(Fig. l i ) .

SI'RINGS AND VAL-iE3C

Replace springs i f craclced. Checlc e l a s t i c i ty by measuring free length Ii (Fig. springs i f length fa l l s 1 mm. under f r ee length.

Check tha t compresseci length i s n o t under 21.5 mm. iinder a load

Fig. 'i2 - Checlùng springs free length: C o i l s -re d ia . -o ienpEh G 3 min. I X = ~ ~ . ~ / ~ O . ~ I I ~ I ~ .

-12) ~ Replace

of 30 IQS.

TAPPETC AXD ROCI(ER ARMS

Tappet surface m u s t be f ree f r o m any mark or groove. If these flaws are l igl i t , they can be removed with a small carborundum block. Otherwise, replace tappet.

Puslwods must be s t ra ight and t h e i r end spherical surrace in gOOd c ondi t i oli . &&e cer ta in there i s n o play behveen roclcrr azm shaf t sind ssat i n cylinder heacl. After mounting clamping interference should be 0.04/0.06 mm. Clearance between roclcer arms and shaft a f t e r assembling should be O.O3/O.06 mm. If more than 0.1 mm.) replace pa r t s .

P a r t s i n Fig. 13: 1 - Head; .2 - Guides; 3 - Springs; 4 - H a l f cones; 5 - Rocker a r m S shaf t ; 6 - Valves; 7 - Seats; 8 - Tappets; 9 - Rods; 1 0 - Roclcer a r m s . Fig. 13 - Cylinder head components.

I

8

Checlc r c i t h , d i a l gauge triro i n s ide diameters ( a ,b ) perpendicular t o each o t h e r ' a t 3 d i f f e ren t l ieights (F ig . 14) . F ig . i 4 - 3ieasuring cy i inùer . Cylinder oversize s c a l e , i n mm. : k g i n a Neru d i a . 1st Oversize 2nd Oversize Difference

4- 0 . 5 i. 1.0 a b LL 400 SO.O/S0.02 S0.5/60.52 s1.0/s1.02 0.02/0.10 LA 490 S8.0 /85 .02 SS.5/SS.52 89 O / S g O2 o .02/0.1 o 3eplace p i s t o n r ings i f w o r n cy l inder d i a . i s not 0.1mm. o v e r n o r - na l dimensions, o r i f i t exh ib i t s s l i g h t grooves. In .L;his case r e s t o r e p r i s t i n e rouglmess o f cy l inder by honing in- s ide sur face r v i t h ai emery c l o t h (g ra in sFze SO/lOO) soaiced with Diesel f u e l , rirorl.:iiig v r i t l i a h e l i c a l movement s o as t o ob ta in a crossliatch sur face p a t t e r n (F ig . 15 ) . If b a r r e 1 shovrs grooves, o u t -of-rounàness o r iirear beyoiid O . In&. , bore cy l inde r and i n s t a l l over- s i ze r ings and p i s tons according t o t a b l e . Berosene engine cy l inders differ f r o m gaso l ine engine cy l inde r s f o r a s m a l l e r area o f the cooliiig f ins , s ince the worliing temperature in lierosene engines should be h igher than the temperature i n gas . engines m.The Icerosene eiigine cy l inder may be i d c n t i f i e d by t h e pro- trusion o r the lorirer f i n . F i g - 15 - Restor ing cy l inder roughness. PISTON AhlD RIXGS

hleasure p j s ton slcirt dianieter at 20mm. f r o m base perpeni l icular ly t o p i s t o n piii. I ~ l a x i m u m w e a r of p i s t o n slcirt must n o t exceed 0.70 nun. If cy l inde r t o p i s ton clearance i s more than 0.25 mm., bore cyxinder and ins-tal1 oversize p i s t o n and rings. F i g . i 6 - ì*ieasuring p i s ton r v e a r . P i s t o n overs ize sca l e , in mm.:

1st Oversize 2nd Oversize i. 1.0 Engine Nevi d i a . + 0.5

LA h.00 79 .85/79.89 s0 .3s /s0 .39 Li 490 s7 .8e /s7 . s9 ss . 3 S / S S .39

Disassemble r ings with expander and remove carbon depos i t s i n growes by kerosene ruashing o r so lven t . Checlc f o r pe r f ec t m a t i n g betrveen r ings and cy l inder , and measure r ing gap (Tig. 17) .

Comprecsion r i n g s 0.25/0.40 mm. O i l con t ro l r i n g s 0.20/0.?5 mm.

Be s u r e rings move f r e e l y i n grooves and wi th a gauge measure the ring t o groove c learance (F ig . r i e a r l i m i t s exceed tl-ie f o l l o w i n g :

1 7 ) . Replace rings and p i s t o n if

1st Compresston ring 0.20 mm. /:I E:;: E:' 2nd Compression r i n g O i l c o n t r o l r i n g 'ille lcerosene engine p i s t o n i s d i f f e r e n t from t he gas. e n g h e p i s ton , i t s head being m o r e concave t o ob ta in a l o r v e r compression r a t i o . 9 ig . 17 - Checking r i n g gap and r ing t o groove c learance . n.

1 9

Ceries LA-400- MANUEL D'ATELIER

WORKSHOP MANUAL

PISTON l'IN AND CONNECTING ROD

Checlc t h a t p i s ton p i n has no t r ace o f grooves or s e i n i r e m a r k s . Otiiervrise, rep lace i t . Neasure diameter of p i s t o n p i n and s m a l l . end bushiiig maiiiiig sure t h a t c learance i s O . 01 5/o.O3O mm. Checlc ali,-- m n t of coiuiecting rod b o r e s (Fig. 1s). P e m i s s i b l e to le rance i s 0.05 mm. iii any direct ioi i a t the end o f p i s t o n p in . A s t ra ighten ing job m u s t be done under a press with gradua1 exer t ions . If excessive deformation i s present , rep lace connecting rod. Fig . i 8 - Checliing connecting r o d bo re aiignmeiit.

CRANICSWT

Reinove expansion plug and d ip shaft i n kerosene or solvent ba th . W i t h a n e t a l t i p remove a l1 sludge f r o m containei-. B y the s a n e m e a n s cleaii o i l d r i l l i n g s (Fig.. 19). Deposits c a ~ be diss-01-*ed by leaviiig cranlcsliaC't i n a lrerosene o r solveiit bath for one hour. k l c e c e r t a i n csairlishaft has no craclcs, otherwise rep iace i t . F ig- 15 - Cleaniiig crairisliaft o i l d r i l l i n g s . Tiitli a micrometer rneasu-e i n two perpendicular d i r ec t ions the c l i a -

Liglit groovcs or dents should be removea w i t h a very f i n e G a r b o - rundum f i l e and f inis l ied w i t l i an equally f i n e g ra in eniel-l c l o t h . Fig. 20 - IlIeasuring cranicpin.

)

meters o f craillr j o u i i i a l s and cranlcpins (Fig. 20 ) . :I

Cranl~cpiii ancl iìeasing

Griiid craiicpin and ius ta l l undersize bearin.gs ii' g r o o v e s ~ o r iueax exceeds 0.10 mm.

Bearing u ide r s i ze t a b i e , i n mm. : Connecting rod C r a i q i n Bearing-Cranlcpkl Clearazlce

b e a r ing d i a k t e r on asscnbly igear 1id.t I

Nerir 34.99/35-00

2nd UEdersize-0.50 31i.49/34.50 i s t ~ n ù e r s i z e - O .25 34.74/34.75 0.020/0.055 o. 10

Beariiigs have a thin s h e l l and requi re no ad jus t ing .

C r a n l c J o u r n a l s and Bearings

Tiie cranlc j o u r i i a i on g e a r train s ide can be o f trvo types: witin babbi t bear ing ( o l d type) and r u i t h needle bear ing (iiew type ) . A b a l l beariiig i s mounted on flyrirlieel side. Neru type: play o r damage (B i n F ig . 2 1 ) . Old type: m a i i i bear ing i s supplied r u i t h 0.2 mm. excess meta1 on I . D . M t e r forced mountiiig i n bore i t m u s t be bored t o the nerv diameter of 30.04/30.O5 mm. (A i n Fig. 2 1 ) . P I a r i m u m clearance betweeii cranlc journa l and m a i n bear ing i s 0.10 mm. Fig. 21 - Geas t ra in housings. 10

checlc needle bearing and rep lace i t if t l iere i s t 0 0 much

Ceries-LA-400 MANUEL D'ATELIER

WORKSHOP MANUAL

) Replace b a l l bear ing oli flywheel s i d e should the b a l l s or t h e r ace .. be damaged. Tliis condi t ion could be de tec ted through a no i se o r i g - i na t ing during the operat ion.

Go o v e r grooves o f o i l s e a l shaft a r e a w i t h a very f i n e gra i i i emery c lo th s o as t o c r ea t e s p i r a l s tu rn ing opposite t o c r d c - sha f t r o t a t i o n . Replace s e a l s (F ig . 22) . If coupling cones, th reads and end Icey s e a t s a r e damaged, cran lc- shaf t should be replaced.

Sl iaf t end threads d i r e c t i o n i s alriays opposite to engine r o t a t i o n .

F i g . 22 - Grooves for seal shaft a rea .

FLYiiHEEL

Engines a r e supplied with the folloriing types o f f lywheels rihich a r e not interchangeable:

Standard: cloclarise r o t a t i o n :

- for mechanical brealier i g n i t i o n (Fig. 23, l e f t ) with 15 mm. high - f o r t r ans i s to r i zed i g n i t i o n , 22 mm. h igh magnet s e a t ; - for mechanical breaicer i g n i t i o n and a l t e r n a t o r housing; - f o r t r ans i s to r i zed i g n i t ion and a l t e r n a t o r h o u s i ~ g (F ig .

magnet s e a t ;

2 3 , r ig f i t ) .

Sp e c i a l : c oun t e rc lo chili s e r o t a t ion : - f o r mechanical breaicer i g n i t i o n ; - for t r ans i s to r i zed i g n i t i o n . Replace flyriheel i f conica1 h o l e o r liey sea t a r e damaged.

Fig. 23 - Flyriheels.

Engines a r e suppl ied with followiiig camshafts aid journa ls :

Standard: engine w i th cloclcwise r o t a t i o n :

- without cam for f u e l fecding pwnp; - with cam for f u e l feediiig pump (Fig . 24, r i g h t ) . Special : engine r i i th comtercloclc~rise r o t a t i o n : - w i t h o u t cani for f u e l feeding pump (Fig . 24, l e f t ) ; - r i i t h cam for f u e l feeding pump. The journa ls f o r t he tr io types d i f f e r i n the d i r e c t i o n o f h e l i c a l l ub r i ca t ing grooves. l i i t h f i n e g ra in emery c l o t h remove any t r a c e o f s e i zu re between journa l and camshaft and checlc that clearance on assembling i s 0.020/0.035 mm. (Fig. 25) . Replacc both p a r t s i f clearance exceeds 0.1 mm. Checlc tha t shaft ends a re n o t grooved. If they do have grooves, remove them. Set camshaft end p lay a t 0.30/0.40 mm. Tliis can be done riith a f e e l e r gauge i n s e r t e d between crankcase and shaft a f t e r having temporarily mounted c r d c a s e cover.

F ig . 25 - End p lay between camshaft and j ou rna l .

1

1 11

MANUEL D'ATELIER Series LA-_400-

WORKSHOP MANUAL

FILTERS 1

Air cleaner: Remove oil, riash filtering element and b o r i l in gaso- line o r lcerosene a i d replace element if screen is brolcen. Fill bowl rvitli clean oil.

Parts in Fig. 26 , left: 1 - C o v e r ; 2 - Filtering e l e m e n t ; 3 - Oil level; LI- - Boi i l . Fuel filter: Remove ruel j i lrmet line to carburetor, talce out filter and riash it riith gasoline. Replace filter if screen has b rea l c s .

Fig. 20 - Fiiters

GOVERNOR

It is a centrifugal type formed by a gear riith flyrmights rihtch - I througli levers - act on the carburetor butterfly valve. The actioii of a spring hoolced on the tlirottle contro1 is opposite to the gov- ernor movement.

The goverrior acts this iiay:

A s engine speed increases, the flyrieights pusli f o r w a r d a plunigcr rihich - througli the linlcage system - tends to closing the butter- fly valve thus decreasing the engine speed. mie centrifugal force

re-opens the 'butt eri'ly valve thus increa.sing the eiigine speed 'Iliese actions on the butterfly valve automatically keep the R.P.M. just about coiistan-t regardless of the engine load change. Fig. 27 - Governar diagram

8 on the flyrieights decreasing, the spring action prevails wliich

LSJBRICATION

It is a forced and centrifugal type. The oil is piclced up by the governor gear and is fed througli the centrifugal oil baffle -to lubricate t h e cranlc mechanism . F u e l filtering .tal

MANUEL D'ATELIER Ceries LA 400_-

WORKSHOP MANUAL

CARBURETOR

P a r t s i n Fig. 29:

1 - Cover; 2 - Gaslcet; 3 - Diff'user; 4 - F i l t e r ; 5 - Floats; 6 - Floats pin; shaft; 9 - Bntterfly valve; 1 O - Angle braclcet; 'I 1 - Idle ad- justing screw; 12 - Butterfly valve contro1 clanip; 13 - Carburetor body; 1 4 - Idle j e t ; 15 - Mixture tube; 16 - Drain scres; 17 -Main j e t ; 16 - Cholce p la te shaf t ; 19 - Lever; 20 - Clioke p la te ; 21 - Carburetor elbow; 22 - Mixture adjusting screw.

7 - Neecile valve and sea t ; 8 - Butterf'ly valve

Fig. 29 - Carburetor blow up vieryr.

iirorliing diagram

P a r t s i n Fig. 50:

1 - In l e t pipe e l i i u w ; 2 - F i l t e r ; 3 - IVeeclie ,,ralve ar.d sea t ; 4 - Floats ; 5 - B o w l ; 6 - Drain screw; 7 - IIain j e t ; 6 - Idle j e t ; 9 - Nixture tu-be; 10 - Idle a i r i i i l e t ; 1 1 .- Idle duct; 12 - fiiixture adjusting screw; 13 - D r a i n o r i f ice ; '14. - Cliolce piate; 15 - iiuxture tube a i r intalce; 16 - Difiuser; 17 - sii.;.:- ture ex i t tube; 18 - Butterfly valve; - Progression or i f ice .

A - On cold engiiie s t a r t i ng , cholce p la te i s lcept shut t o l i m i t a i r i n l e t aild depress suckion duct. This gii-es a suf f ic ien t ly r ich minture f o r such a condition.

Fig. 30 - Star t ing.

B - A t i d l e , rvith bu t t e r f ly valve sliut and cholce valve opeii, p i s t o i i suction creates a vacuum on id l e duct through which fuel i s l e t i n , m i x e s with air and reaches cylinde- tlxrougli the or i f ice dorvnstream o f bu t t e r f ly valve. Idle device includes adjusting screw which carburates mixture.

Fig. 31 - Id le .

C - On a c c e l e r a t i n a , s u c t i o n th.rouEh i d l e d u c t d e c r e a s e s a l thougl i \ - - t h e r e i s n o f u e l d e i i v e r y from m a i n j e t . Dvo o r i f i c e s , connected w i t h t h e idle d u c t and p o s i t i o n e d jus-t about a t t h e b u t t e r f l y v a l v e opening, provi.de t h e n e c e s s a r y quan- t i t y for t h e a c c e l e r a t i o n .

Fig. 32 - Progres s ion .

D - A t n i a x i m u m ou tpu t , with b u t t e r f l y v a l v e fu l ly open, a des res - s i o n occurs i n the d i f f u s e r rvhich t a k e s i n f u e l from m a i n j e t riliereas f u e l f l o r u i s c u t off from i d l e d u c t due t o laclc of suc- t i o n i n i t . Fig.. 33 - E i a x i m u m o u t p u t .

i'iaiiit enu1ic e

Detach c a r b u r e t o r from engine . Remove cover r v i t h c au t io i i t o avoid deforming f l o a t s .

Unscreru mixture t u b e , i d l e and m a i n j e t s , and bowl drain screrv.

Do n o t u s e m e t a l t i p s but conipressed air t o c l e a n j e t s , ca1.i- b r a t e d o r i f i c e s and d r i l l i n g s .

Clieclcs

- Checli o n s u r f a c e p l a t e that f a c e s of bowl and cove r have no

- Checlc that n e e d l e v a l v e does n o t l e a l c and i s moving f ree ly- . - Checlc that r l o a t s d o n o t touch b o r u l r v a l l s . Check f o r p o s s i b l e

deformat ions i n suppor t p l a t e by rvatclung p o s i t i o n of f l o a t s as compared t o a p l a n e p l a c e d under them. This should b e done by removing need le v a l v e and laying b o t h ends of f l o a t s upon a r u i e r (Fig. 34) .

- Check f l o a t s p o s i t i o n cor responding t o c o r r e c t f u e l l e v e 1 i n bortil, a s follows:

òefo rma t ions .

F ig . 34 - Checicing f i o a t s .

14

~~ SeriesCLA-400 MANUEL 'D'ATELIER

WORKSHOP M A N U A l ~

\ - Turn upside d o ~ i n the cover complete with gaslcet and needle - insert Tool R70-2003-01 betweeri cover and floats. Use side of tlie gauge marlced by letters: - B, 5 mm.l;liiclmess, f o r gasoline operation; - P, 2 mm. tixLclciiess, f o r Icerosene operation. If position is not right, correct by actiilg on needle valve support lip (Fig.

Fig. 35 - Checlùng height of floats. At correct floats position, fuel leve1 in borul should be

valve, 'and remove diffuser;

35). This operation is necessary when the floats .. o r the needle valve and seat are replaced.

(~ig.36): f o r gasoline 18 mm. for lcero s ene 17 mm.

Fig. 36 - Ciieciùng fuei ievei. Carbure tor charac t eris tics

Jet dia. I

1 O 0 Diffuser dia. Code Operati on Erigine - Nodel mm. in mm. Twe

I d l e Main - - - LA 400 50 94 20 B 20 Gasoline LAP400 50 95 LAL400 50 77 LA. 490 50 97 LAP490 50 1 O 0

%O P 20 ICerosene 16 e 16 Gasoline 21 B 21 Gas:>liiie 21 P 21 ICer o s ene

Jets a r e for standard oil bath air cleaners. Iierosene t w e carburetor has another diffuser in carburetor eiboru rig1i.L at the idle jet position. After assemblirig carburetor, checl: that there are no l e a l c s f r o m fuel lines and unions.

Ii'UEL FEEDING PUbP Pump is installed only on request. It is a diaplrragm type actuated by' camshaft tlrougli a push r o d - Check condition of diaphragni and two valves, and replace defective parts.

IGNITION CIRCUIT It is a high voltage alternator type witith rotating inductor a d fixed armature coil. The inductor is a magnet set in a seat on the flywheel periphery. The armature is formed by a coil fixed on the cranlccase and rround around a core made by a paclc of magnetic sheets having two rvind- ings: l o r i ami high voltage.

Fig. 37 - Plechanical brealcer ignition.

15

I MANUEL ~ .D'ATELIER S e r i e s L A 400---~ ~ ~~~ ~

WORKSHOP MANUAL

i The magnet r o t a t i o n causes a f l o w v a r i a t i o i i i n t h e c o i l , whicli c r e a t e s a l o w v o l t a g e c u r r e n t i n t h e pr imary winding. This p r o p e r l y i n t e r r u p t e d c u r r e n t determiiies i n t h e secondary wind- ing a v o l t a g e a m p l i f i c a t i o n capable o f caus ing a sparlc between spark plug e l e c t r o d e s : The c u r r e n t i n t e r r u p t i o n i s ob ta ined as folloris: With mechanical brealcer: B r e a l c e r c o n t a c t s a r e a c t u a t e d by a C a m O n t h e cranlcshaft t h r o u g h a push rod w i t h a condenser i n parallel. i f i t l i t r a n s i s t ' o r : It has n o moving c o n t a c t s and i t i s housed i n s i d e t h e c o i l cover , embedded i n a p r o t e c t i v e insulating compound. It i s formed b y t h r e e c i r c u i t s : a base c i r c u i t i n c l u d i n g t h e c o i l and t h e cu t -of f t r a n s i s t o r , and two p i l o t s : one o p e r a t i n g a t a l o w r.p.m. and the o t h e r a t a liigli r . p . m . The mechanical b r e a k e r i g n i t i o n c o i l and magnet a r e n o t i n - t e r - changeable r i i t h t h e same parts for t h e t r a n s i s t o r i z e d i g n i t i o n . The t r a n s i s t o r i z e d i g n i t i o n m a y be i d e n t i f i e d from t h e standard type for d i f f e r e i i t shape and s i z e of c o i l cove r .

P a r t s i n F i g . 38: 1 - Sparlc p l u g ; 2 - Stop push b u t t o n ; 3 - F+F&ieel; 4 - Nagnet; 5 - C o i l ; 6 - T r a n s i s t o r box. F i g . 38 - T r a n s i s t o r i z e d i gn i t i on . Checlcs

Co i l : Checlc i t r i i t l i a magnetonieter and r e p l a c e i t i f defectb-ve.

D a t a for e l e c t r i c riindinns:

R e s i s t a n c e , 01un Standard Transis t o r i z e d

Primary 0.30 0.22 Secondary 2500/Lt500 7500/7700

Insulation for s t andasd c o i l i s red; t h e oiie f o r t h e t r a n s i s t o r - i z e d c o i l i s g reen or gray. Checlc that i n s u l a t i o n i s n e i t h e r craclced n o r broken.

Checlc connec t ion of high v o l t a g e c a b l e o n c o i l and spa-lc plug. \ - For stai idard i m i t i o n o n l y : Clieclc that i i i r e betiieeii c o i l aiid brealc- e r c o n t a c t s i s n o t grounded or b a d l y i i i s u l a t e d .

i . Fig. 39 - Chedcing c o i l . , Nagnet: Magnet e f f i c i e n c y m a y d r o p i f f l j v h e e l .undergoes r e p e a t e d laioclcs or i f i t becomes too h o t . C a r r y o u t check a$ f o l l o r i s ( F i g . 40) : P l a c e s l ider . . 'of T o o l R972701 h o r i z o n t a l l y a t l e v e 1 w i t h no tc l i (a) f o r s t a n d a r d i g n i t i o n , and no tch (b ) for a t r a - q s i s t o r i z e d i g n i t i o n and checl; i f i t i s a t t r a c t e d by magnet. F i g . .40 - Checlcing magnet Remameti 'zat ion: if magnet i s demagnetized, liave i t remagnet ized by an E l e c t r i c a l Se rv ice S t a t i o n equipped r i i t l i a magnet iz ing dev ice having tlie f o l l o r i i n g cha rac t en - i s t i c s :

Nagnetomotive f o r c e 3500 Ampere turns

Pole m i n i m w n d i ame te r 80 mm. i lifagnetic f lux 8 0 / 8 5 G a u s s

16

~~ MANUEL D'ATELIER ~I--~~~oo=; eri e LA 4

WORKSHOP MANUAL

~ - Apply flywlieel t o dev ice . - i n s e r t betrveen f l y 9 h e e l f i n s , oppos i te magnet, shaped s o f t i r o n

rvedges s o ad t o c l o s e t h e space between f ins (Fig. 4 1 ) . F o r counterclockwise r o t a t i o n engines do t h e same thing t h e o t h e r r v a y around.

\

- Tighten f lywheel betrueen po le shoes . - Connect e l e c t r i c c o n t a c t t o magnet izer f o r a few seconds and

F i g . 41 - Remagnetizing f lywhee l .

Condenser: Replace condenser i n case of brealcages o r burn up. This condi-t ion can b e d e t e c t e d because c o n t a c t s wear out qu ick ly and i g n i t i o n s t a g g e r s .

Sparlc plugs: See t a b l e below f o r r igh t s p a r l c plugs:

r e p e a t o p e r a t i o n trvo or t h r e e t imes .

LAP - BRAND LA -.LAL Elarel l i cw 150 N cv 50 NI

C h a m R i o n UL 15 Y - Ii L G F 50 - Bosch W 95 T1 U h5 TI

Clean e l e c t r o d e s r v i t h r i i re brush and compresseci a i r , zuid rese . t gap t o 0 . S mm.

Replace spar lc p lugs if t h e y e-xhibit t r a c a s o? brealcage on t h e por- c e l a i n insiilator o r excess ive ivear o n groiilid !::iectrode. i n my c a s e , r e p l a c e them a f t e r 300 hours of opera t ior i .

F ig . 42 - Checlung electi-ode gap .

ELECTRICAL EQUIPMENT

The most common equipment - supp l i ed on r e q u e s t - 5s: ) BOSCH S t a r t e r g e n e r a t o r : J(R) 14V - llA-32, 12V, IPS.

Features : 1 Metric HP a t 750 r . p . m . startiiig motor

BOSCH Voltage r e g u l a t o r : Z AD 14V - 11A. B a t t e r y p r e s c r i b e d : 27 Ah

DUCATI A l t e r n a t o r :

90 Tiatts g e n e r a t o r

Vo l t s l i a t t s Sys t em 6 4 o li gli t ing

40 l i g l i t i n g + 6 mixed 6 mixed + 18 b a t t e r y recharging"

+ . i i i t l i r e c t i f i e r and r e g u l a t o r s e t . "Batte- p r e s c r i b e d : 18 Ah .

I F i g . 43 - E l e c t r i c a l system with s t a r t e r g e n e r a t o r .

Current

a . C .

a . C .

d . c .

77

Series LA-W0-p -- MANUEL D'ATELIER

WORKSHOP M A N U A l

1 Starter generator and voitage rewiator For overliauling alrvays contact a Bosch Electrical Service Station. Maint enanc e : Adjust belt tension. Under thumb pressure, belt must depress about 1 cm. (Fig. 44). - Check brushes condition every 2000 houixi, removing baclc protec-

tion clamp, talcing out brushes and cleaning housing. Length of new brushes 23 mm. iiear limit 12 mm. Even if only one of the brushes is under limit, replace a l l .

- Check spring tension with dynamometer. Norma1 valve: 85O/lOO gms. Fig. 44 - Checlung belt tension. Tests and checlcs Load test of starting generator depends on battery condition. Malce a circuit as in Fig. 45 with a 20 Amp. d.c. ammeter. iiith a haif charged battery and lines connected for a 50 Watt absorption, cur- rent output should be 6 - 10 Amp. If under, verify if defect is in Check for positive ground contact in regulator, rvhich rvould other- wise cause immediate burn up of fuse inside regulator upon starting. in such case, restore contact and replacc fuse with 0.5 mm. dia. copper conductor. If there are no changes, the defect is probably in the startillg generator which should be checlced on the electrical test bench. Fig. 45 - Checlcing starting generator load current.

voitage reguiator. if necessary, repiace regulator aild repeat test. 1

Alt ernat or Fixed armature and rotating inductor type rvith permanent magnetoes. Test and checlc Checlc for perfect connection and ground insulation of stator Wind- ing. Do not change length or cross section of rvires (1 .5 mm.2). 2 Connect bulbs for a total absorption of 36-40 iiatts and bring en- &.ne specd to 3000 r.p.m. Voltage must be approximately 7 Volts, brightness o r the bulbs. Disconnect rvire from battery positive termina1 and connect a 5/10 Amp. d.c. ammeter. Sliould there be no current, checlc fuse inside voltage regulator. Parts in Fig. 46: 1 - Battery; 2 - Rotor; 3 - Stator; 4 - Back lights; 5 - Voltage regulator; 6 - Ilorn; 7 - Switch; 8 - Connecting plate. Fig. 46 - Lighting alternator with battery recharging. System rvithout battery recharging Carry out only first test made in above system. Alternator feeds bulbs directly so voltage is regulated by load applied, rvhich must not exceed 40 Tiatts. A higher load causes little brightness in the bulbs whereas a loiver load raises voltage thus shortening bulbs life. Parts in Fig. 47: 1 - Rotor; 2 - Stator; 3 - Baclc lights; 4 - Srvitch; 5 - Connecting plate.

obviously shown by a good

1

Fig. 47 - Lighting alternator rvith no batte- recharging. 18 I

~ ~ ~

~ ~ Series-~LAL4OO MANUEL D'ATELIER

WORKSHOP M A N U A L

V - A S S E M B L Y A N D T U N I N G

INTRODUCTION

After checlcing par ts according t o instructions outlined i n preced- ing chapter, assemble engiiie according t o sequence specified. This r i i l l prevent drarubaclcs and damages. Before assembling p a r t s , clean them rvith Icerosene and dry them ruith coinpressed a i r . Lubricate moving par t s t o prevent seizure upon f i r s t s t a r t i ng . Use c l e a n o i l t o l ay a lubricating coat on par t s . A t each reassembling replace gaslcets ma o i l seals. U s e torque wrenches f o r correct bo l t tightening.

OIL SEALS

Clieclc that edges have not l o s t t1iei.r e l a s t i c i t y and have no craclcs., Otherrvise, replace them not forget t ing t o : - C l e a i and lubricate o i l seals bore; - I n s t a l l seals ruith a buffer with l i p s facing i n .

t r a in case cover. Dimensions are :

, ,

) Seals sliould be mouiited i n cranlccase at cranlcshaft end and i n gear

Crankc ES e :; i d e 50 YL 20 x I O m. G e a r t r a in side 35 x 2: >: 7 mm.

CRANICSILWT iDID FLMWEEL

Prepaiation: Assemble centrifuga1 o i l baf f le matching i t s h o l e s with those i n cranlcsliaft. Heat timing gear i n oven t o 130°C. ancl inser-t i t i n shaft with key seat matching lcey. Znstall ball bea r - ing, pressiiig inside race. DistLnce between ball bearings edge and gear t r a in 1nus.t be 135.0/135.1 mm. Assembling: Place cranlcsliaft i n cranlccase. Do not c'umage seal ring. R e s t outside sace o f bearing against cianlccase r m l l . Bearing should be secured rvith locking pin on rihich a s m a l l rubber r ing shouid be slipped f r o m the inside. Tighten nut t o 3 ICgci. (Fig. h 8 ) . I n s t a l l a i r shsoud, i n s t a l l flyrvheel o n cranksliaft i v i t h lceyway matcliing key. Tighten loclcing nut t o 35 Kgm. To prevent rotat ion during tightening operation, use a clamp or similar device.

Fig. 48 - Cranlrshaft ball bearing loclcing pin. PISTON AND CyLIhQER

A s s e i n b l e piston, connecting rod, piston pin and connec.ting zmd bearing. Install piston pin with sliglit hand pressure and secure i t with snap r ings. Assembling direction of par t s i s immaterial. install connecting rod cap and bearing, matching marlcs on cap and big end (Fig. 49 ) . Torque nuts- t o 3 IQm. and secure with loc lq la tes . Fig. - Connecting rod reference marks. i n s t a l l rings o11 piston with gap o f f s e t half turn one w i t h respect t o the other (Fig. 50) .

Fig. 50 - Rings posit ion.

)

19

MANUEL D'ATELIER Seriec LA-400-

WORKSHOP MANUAL

i hit a yolce or a pair of pliers under piston to support it (Fig.51). insert a shim on cranlccase and mount cylinder on piston.Tlle lorver edge of the cylinder being beveled, no comprcssor is necessary for rings . Check with ruler that head of piston at TDC is leve1 rvith cylinder edge or just 0.5 mm. over it . Fig. 51 - Installing cylinder and checlung piston height.

GEAR TRAIN IIOUSING

Mesuiting NadelLa-DL ,3025 and Durlcopp RNAFF 3 0 x li0 x 26 (old style) needle bearings. Lubricate bearing seat and introduce it with Tool R~O-3595-46 using 30 mm. hub (Fig. 52). Pressure should be applied on outside edge without lmoclcs from the punched side. Center bearing in bore with utmost care. After assembling, bearings must not protrude from housing. For old type housings, bearing mounting operation is outlined in Pragraph "Cranlcshaft" (Chapter of Overhauls) . Fig. 52 - Installing needle bearing.

\

Centrifuga1 governor: Slip in governor lever shaft setting its exact position through dorveled end pin which engages lever groove

- Center interna1 lever on hole oi governor shaft housing and se-

- Elount governor controlbox and gasket, connecting spring at end

- Mount complete governor gear in housing, position it in seat

(Fig. 53).

cure it rdth a bolt.

of ievers (Fig. 53).

ruith the shaft and secure it from outside rdth an oil seal riash- 1 er and bolt. Checlc smoothness of gear and plunger, and mount b o r i l . Fig. 53 - EIounting lever and governor.

TIMING

With piston at TDC install camshaft and journal, matching refer- ence marlcs on gears. If there are no marlcs, install camshaft ruith cams uprvards so that - after housing is mounted - tappets r u i l l be at same height. Insert tappets in housings, the short one (intalce) in guide near cylinder, and the long one (exhaust) in external guide. Fig. 54 - Timing. 20

. . M A N U E1 D'ATELIER Series LA~~400-1,L- ~~ ~~ ~~

WORKSHOP MANUAL : . ~~ ~.

Mounting gear tfain housing o n cranlccase

- Momit hoiising' w i t h ' gaslcet on crankcase . - Tighten screivs t o 3 I igm. - Mount cover complete with o i l s e a l r i ng 01; hous ing with push . rod f o l l o r v e r on c o n t a c t brealcer s i d e (only r v i t h s t c u ù a r d igni-

\

t i o n ) .

m a c t p o s i t i o n of cover i s determined by t a p e r p i n c e n t e r i n g .

F ig . 55 - Center ing cover on gear traili hous ing .

- Iiistall valves. - hfount s p r i n g s , r r i t h d i s c on bottom and p l a t e o n t o p . - Compress s p r i n g s w i t h T o o l R70-1460-06 and i n s e r t half cones.

( F i g . 56 ) .

F ig . 56 - Ins ta i i ing springs. - Checlc s p r i n g s p o s i t i o n and vaives smoothness. - Install r o c k e r arms shaft aiid o i l s e a l r ing, roclcer arms and t T I 0

s i d e shims (LA 11.00) or a c e n t r a 1 s h i m betveei i two roclcer arms (u 490). O i l seal r,ing. should l o c k t o w a r d s roclcer m m s shaft i n t r o d u c t i o n s i d e .

- On oppos i t e s i d e checlc expansion p lug t i g h t n e s s and - if necec- sary - seal w f t h m e t a l , s e a l i n g compound. If c y l i n d e r head has

o s t e e l roclcer &%I shaft , r e p l a c e i t r r i t h a bronze one. - Mount head on c y l i n d e r with me ta l g a s k e t , m a l c i n g c e r t a i n that

push r o d s a r e c ros sed . In o t h e r words, tlie i n t a k e rod r e s t s on t a p p e t c l o s e s t t o c y l i n d e r and d r i v e s l e f t r o c k e r a r m ( f a c i n g g e a r t ra in housing); t h e exhaust rod, from e x t e r n a l t a p p e t , d r i v e s r ight r o c l p r . a r m ( F i g . 57) .

I

F i g . 57 - Install ing push rods. - Install push rod tube, ,and p r o p e r l y house o i l seai r ings. Adjust c l ea rance betrveen r o c k e r arms 'and valves turning a d j u s t i n g screw a f t e r loosening loc lmut . With co ld engine, c l e a r a n c e f o r b o t h valves i s 0.2 mm.

1 ,

F i g . 58 - Adjus t ing roclcer arms c l e a r a n c e .

21

MANUEL D'ATELIER Series LA 400-

WORKSHOP MANUAL

1 I G N I T I ON

Standard Typ e: Insta11 push r o d i n gear t r a i n liousing with longest guide looking outs ide.

- N o u n t contact breaker and condenser. - Install c o i l on crankcase wi thout t igh ten ing clamping screTis. - I n s e r t a 0.4/0.6 mm. cardboard s h i m ( C i n Fig. 59) between

magnet and c o i l (a i r gap); push c o i l towards flyruheel and t igii t- en screws.

F ig . 59 - Set t ing a i r gap, - Rotate flyiiheel and br ing p is ton a t TDC, loosen ad jus t ing screiv

of breaker contacts and s e t gap a t 0.7 mm. (F ig . 60 ) .

F ig . 60 - Checking breaker contact gap. - Connect a c i r c u i t iiith a timing l i g h t and sri i tch o f f through

- Rotate ilyciheel (cloclniise f o r standard engines, counterclodki i i ise f o r C . C . W . engines) ti11 timing l i g h t s&tches o f T a t cont- t a c t opening. i n this pos i t i on check that d is tance ( t iming ad- vance) bctween: a) top edge of magnet and inner edge o f c o i l core , f o r standard engine ; b) bottom edge of magnet and inner edge oT c o i l core , f o r coun- terciociniise engine i s 5/7 mm.

- Remount c o i l and breaker covers.

contac ts (Fig. 6 1 ) . I

Trans is tor ized 'iVp e: ins ta i i c o i i (green) on crarilccase ma acijust a i r R a p as out l ined above. Connect c o i l wire i n t r a n s i s t o r cover ana secure i t t o crankcase. F ig . 61 - Checking niagnet t iming advance . Complete assernbling follorving p a r t s :

O i l d ip s t i ck ; Flywheel guard p l a t e ; S t a r t i n g pul ley ; A i r shrouds ; Sparlc plug aila connecting cables; Rocker a r m cover with brea ther caps; ' Fuel feeding pump r i i t h push rod, i f suppl ied; Muf f l e r ; Tanlc, l i n e s and bracke t ; Connect b u t t e r f l y valve lever and governor through spr ing t i e rod, and secure carburetor r i i t h support elbow; Engine supports; Air cleaner with support and tube; Clutch b e l l , i f provided.

i

22

Series LA-400 ~ MANUEL D'ATELIER

WORKSHOP MANUAL

GOVEFWOR LEVER ADJLJSTMENT

Set governor in closed position with throttle lever fully opened ( 1 ) .

Completely loosen counter lever clamp (3) and shift carburetor control lever and fully open butterfly valve ( 2 ) . Loclc clamp in this position and checli f o r lever snioothness by operating throttle control.

Fig. 62 - Adjusting governor control lever

CAPSCREWS TORQUE SPECIFICATIONS

Position

Clutch bel1 Flywhe e 1 Cylinder head Connecting rod Gear train housing Main bearing loclung pin Shroud Coi1 Carbur e t or elb ow

Torque I-.

'I h 25

6

3 3 3 1 - 3

1.5

1.9

Thread e; Pitch mm.

16 x 1.5 20 x 1.5 10 x 1.5 8 s 1.0 a 1.25 8 x 1.25 8 s 1.25

6 x 1.0 8 x 1.25

23

~ :. ~ ~ ~ M A N U E L ~ ~D'ATELIER ~~ ~~ ~

WORKSHOP MANUAL

V I - S E T T I N G A N D T E S T I N G ~~ i

PRE-STARTING CHECRS

After assembling engine, procede with following operations:

- F i l l o i l s m p and air cleaner t o l e v e l . - Open f u e l coclc. .

When rep lac ing carburetor or rilien overhauling, malce a f i r s t se t - t i n g by f u l l y c los ing mix-ture ad jus t ink screii and then unscreri- ing i t o f 3 turns.

- C l o s e cholCe'pPa-afe.. - Set t h r o t t i e a t 1/3 o f i t s t r a v e i . IDLE RUIIQJING TEST Al1 s e t t i n g s sliould be m a ù e w i t h h o t angine using a tachometer. Garry out t e s t as follows:

- S- tar t . engine m a graduai iy open choice-piate. - iceep speea a t approximateiy 2000 r . p . m . - Operate t lmot t le malcing sure that b u t t e r f l y valve and a l 1 l i n l c -

Do i i o t operate ' b u t t e r f l y valve or l inkages d i r e c t l y . By exc.luc?iiig governol-* ac t ion , you could cause incont ro l led engine speeds . For engines with remote t l i ro t t l e cont ro l , i t i s riee'essary t o have a f l e x i b l e cable witli l ever o r similar .deyice whic3 w i i l a l l o w acce lera t ing through governor .

,

? o r 10 minutes. I

age s worlc smoo t h l y .

Set t ing i d l e mixture Bring speed t o : . .

1200/1350 r . p . m . E Gasoline engines-

1300/1350 r ep ;mo , Iierosene engines by ac t ing OLI ad jus t ing screw A (F ig . 6 3 ) and at the same time reg,- u l a t i n g mixture through screw B on elbow (Fig. 6 4 ) . .By turning screw B i n , fue l - a i r mixture g e t s leaner ; by unsc rekng i t , fue l - a i r mixture .gets r i c h e r .

After a few acce lera t ions , i d l e speed should remain constant . Should i d l e speed change, ad jus t agaiii through screws A and B . If engine i s slow i n responding t o t h r o t t l e ac t ion , s l i g l i t l y un- screw screw B t o ob ta in a r i c h e r mixture.

F ig . 63 - Set t ing i d l e speed. Fig. 64 - Set t ing i d l e mixture. I d l e and m a x i m u m speed s e t t i n g ~ Act on i d l e screw on the l e f t o f t h r o t t l e cont ro l box unti1 a s l ig l i t speed increase i s obtained. Lock screw w i t h loclc nut. This way, governor r i i l l always s t e p i n under any l o a d condi t ion. Accelerate . to m a x i m u m a l1 the way t o 3300 r . p . m .

Limit l ever cont ro l t r a v e l througli maximwn,speed screw and loclc i t w i t i i iock nut (Fig. 6 5 ) . F ig . 65 - Set t ing i d l e and m a x i m u m speed. 24

i

. i

Series LA 400 ~~~~ M A N U E L D'ATELIER ~

WORKSHOP M A N U A L

V I 1 - A P P E N D I X

P E E F O R Irf A X C E L I X I T S

POTER T-UE OFFS

Tlre eiigiiie i s provided w i t h t lmee power talce ofrs :

1 ) Nain p . t . 0 . 011 gear t ra in s i d e : e n t i r e r a t e d power a l l o w a b l e .

2 ) Secoildary p . t . o . o n f l p i h e e l s i d e : - d i r e c t coup l ing for e n t i r e r a t e d power - b e l t coup l ing up t o h Metr ic H.P.

I For s p e c i a l perfoi-niances c o n t a c t our T e c h i c a l Department .

h g u l a r i t i e s are expressed i n degrees :

An-lari t i e s Continuous Discont inuous

Long i t u d i n a l 30° 3 5 O Transverse 150 40 o

MAXI?.iUIrf E.ND THRUST ON CRANIZSHAFT )

&id l oad iii bot l i d i r e c t i o n s m u s t n o t exceed 250 I&.

i U X I I m M BEbDING LOAD ON CWIISHAFT

For b e l t d r i v e

Load 011 gear t ra in s i d e Lever a r m L o a d o n flywheel s i d e Lever a r m

OVERALL DIPENSIONS OF ENGINES

INDUSTRIAL TYPE

AUTOP.iOTIV-: TYPE I

P1 = 120 Icg. s1 = 62 Iig. P2 = 80 1%. 52 = 68 I@.

(Page 25)

(Page 26) 25 ---20

. . . . ........ MANUEL D'ATELIER Ser i e s LA 400 i- ~~~

WORKSHOP MANUAL

I N D E X \

CHAPTER Page CH4PTER Page

Eiigine Cutaway View . . . . . . . . 2 I g n i t i o n C i r c u i t . . . . . . . . 15 SPECl3ICATIONS . . . . . . . . . . . . I 3 E l e c t r i c a l Equipment 17 MAINTENANCE SCEEDULE ...... 11 4 . ASSEMBLING AND TUNING . . v 19

. . . .

C a p a c i t i e s . . . . . . . . . . . . . . . . 4 I n t r o d u c t i o n ............ 19 DISASSENBLY INSTRUCTIONS I11 5 O i l S e a l s ............... 19

k i g i n e In s t a l l a t ion . . . . . . . C r a n l c s h a f t & Flywheel . . . 19 ' 5 Disassembling . . . . . . . . . . . . . 5 P i s t o n & Cylii ider ....... 19 Flyrihe e 1 >lame t 6 Gear Train Housing . . . . . . 20

omr a u L C ~ C I C S g: SPECS .. IV 7 Timing . . . . . . . . . . . . . . . . . . 20 Cgl inder Head . . . . . . . . . . . . . 7 Cyi inùer Head . . . . . . . . . . . 21

i . . . . . . . . . . .

Valves. Guides and S e a t s . . 7 Igni t i oii . . . . . . . . . . . . . . . . 22 Spr ings and Valves . . . . . . . . 8 Governor Lever .4cijust . . . . 23 Tappets and Roclcer Arms . . . 6 Torque S p e c i f i c a t i o n s . . . 23

o Cyl inder . . . . . . . . . . . . . . . . . . 9 SETTING AND TESTING . . . V I 24 P i s t o n and Rings 9 P re -S ta r t ing . Checks ..... 24 Piston F in & Connecting R o d . 10 I d l e Running T e s t ....... 24 C r a n l c s h a f -t . . . . . . . . . . . . . . . . 1 O S e t t i n g I d l e Piixture 24 Flywheel .................. 11 I d l e & P i a x . Speed S e t t . . . 24

...........

.... i

C a m s h a f t .................. 1 1 QPENDM (Perform . Lirnits)VII 55 F i l t e r s . . . . . . . . . . . . . . . . . . . 12 Power Talce O f f s . . . . . . . . . 25 Governor . . . . . . . . . . . . . . . . . . 12 Ma- . Oper . A n g u l a r i t i e s . 25 L u b r i c a t i o u . . . . . . . . . . . . . . . 1 2 M w . End Thrust On Shaft . 25 Carbure t o r . . . . . . . . . . . . . . . . M a . Bending Load ....... 25 13 fiel Feeding Pump . . . . . . . . . 15 Engine Overa l l Dimensions 26

27