GTH990Engine Parts Manual

Models: 004946-0004946-1

GTH990 OHVI SERIES ENGINE Models 004946-0, 004946-1

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3

ITEM PART NO. QTY. DESCRIPTION

1 0C57290SRV 1 ASSEMBLY, CRANKCASE HOUSING WITHSLEEVE

2 0E9843 1 SEAL, 38 I.D. CRANKSHAFT 3 090388 3 SCREW, HHTT M6-1.0 X 12 ZINC4 0C5372 1 ASSEMBLY, BREATHER5 0C3005 1 GASKET, BREATHER COVER6 0E3372B 1 SEPARATOR, OIL BREATHER7 0D8067A 1 ASSEMBLY, HEAD #1 G&S 8 071983 4 RETAINER, PISTON PIN 209 0C2981C 1 ROCKER, COVER NO OIL FILL

10 045761A 4 STUD M8-1.25/10MM X 30 G5 ZINC11 0E2950 2 PISTON, 8.5:1 90MM DIA (LOW COMP.)12 0215330SRV 2 SET, PISTON RING 90MM13 0E1466 2 PIN PISTON 20 DIA 14 0D4041 1 ASSEMBLY, CAMSHAFT & GEAR 15 0C2983 1 SHAFT, GOVERNOR

16A 0C2985A 2 ROLLER BEARING, GOVERNOR PLATE16B 0C2985B 1 ROLLER BEARING, GOVERNOR

W/ROLLERS17 0E2743 1 ASSEMBLY,GOVERNOR GEAR18 0A7811 1 SPOOL, GOVERNOR MACHINED19 0C2977 1 GASKET, CRANK CASE 20 0C5943 1 SEAL, OIL PASSAGE 21 0E4357C 1 ASSEMBLY, CRANKSHAFT HORIZ L & G22 0E3223 2 CONNECTING ROD23 0D2157 2 SCREW, SHC M6-1.0 X 5024 0E6098 1 SCREEN, OIL PICKUP25 0D4123A 1 ASSEMBLY, OIL PUMP W/O O-RING26 0E8152 1 O-RING, 0.49 ID X .07 THICK27 0C3011 2 COVER, OIL RELIEF28 0C3009 2 SPRING, OIL RELIEF 29 0C3010 2 BALL, 1/2D OIL RELIEF 30 093873 2 WASHER, LOCK RIB M631 0F5458 1 SCREW, PLASTITE HI-LOW #10 X 3/832 0C5998 1 CLAMP, OIL TUBE33 0D1667 1 ARM, GOVERNOR34 0C2991 2 E-RING, GOVERNOR ARM 35 0C2988 1 THRUST WASHER, GOVERNOR 36 0C2992 1 BUSHING, GOVERNOR LOWER 37 0C3971C 1 ASSEMBLY, DIPSTICK WITH HANDLE

ITEM PART NO. QTY. DESCRIPTION

38 0C5305 1 TUBE, DIPSTICK39 0C3027 1 O-RING, OIL CLR 3/8 X 1/240 0E9842 1 SEAL, 42 I.D. CRANKSHAFT 41 0C5731 1 ASSEMBLY, HOUSING COVER WITH

SLEEVE42 0C3006 9 SCREW, HHFC M10-1.5 X 5543 080318 8 SCREW HHFC M6-1.0 X 2544 0930640SRV 1 ASSEMBLY, OIL FILL CAP46 0D5269 1 ROCKER, COVER WITH BARB FIT47 0C2979 2 GASKET, VALVE COVER 48 086515 4 KEEPER, VALVE SPRING (SET OF 2)49 0D2274 4 RETAINER, VALVE SPRING 50 0D3867 4 SPRING, VALVE 51 078672 2 SEAL, VALVE STEM D752 0C5371 4 WASHER, VALVE SPRING53 072694 4 STUD, ROCKER ARM PIVOT54 0D3998 4 NUT HEX M8-1.0 G8 YEL CHR55 0C3027 2 O-RING, 3/8" X 1/2"56 0D5313 4 ROCKER ARM57 0D6024 2 PLATE, PUSH ROD GUIDE58 0C2976 12 SCREW HHFC M8-1.25 X 6559 086516 2 VALVE, EXHAUST60 0C2229 2 VALVE, INTAKE61 083897 4 TAPPET, SOLID62 0D8067B 1 ASSEMBLY, HEAD #2 G&S63 0D9853D 4 PUSHROD, 14764 0C2978 2 GASKET, HEAD 65 0D4788 2 PLUG,STD PIPE 3/866 0D40100ESV 1 KIT GASKET67 0E29500SRV 1 KIT PISTON & RINGS68 0D40120SRV 1 KIT BREATHER ASSEMBLY69 0E27430SRV 1 KIT GOVERNOR ASSEMBLY70 0D8675A0SRV 1 KIT HEAD ASSEMBLY CYLINDER 171 0D8675B0SRV 1 KIT HEAD ASSEMBLY CYLINDER 272 0D40150SRV 1 KIT OIL RELIEF73 0D40160SRV 1 KIT GEAR COVER74 0C4138 2 GASKET, EXHAUST PORT75 0F0462 4 NUT, HEX W/TOOTH WSHR M8-1.2576 0C2993 1 SEAL, GOVERNOR SHAFT78 0D6147 5 SCREW, HHFC M6-1.0 X 10mm

Models 004946-0, 004946-1 GTH990 OHVI SERIES ENGINE

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GTH990 OHVI SERIES ENGINE Models 004946-0, 004946-1

5

ITEM PART NO. QTY. DESCRIPTION

90 0D6592 1 WINGNUT, AIRBOX91 0D9961 1 ASSY, CHOKE & THROTTLE92 074908 2 SCREW, HHTT M5-0.8X1093 051713 1 WASHER, FLAT M594 0D6342 6 BALL STUD95 0D9784 6 LOCK NUT, M3-0.596 0E1451 1 ROD, THROTTLE97 031879 1 WASHER, FLAT #498 0C5136 4 KNOB, AIR CLEANER99 0E3146 4 SPACER, ROTATING SCREEN GUARD

100 0D7815A 1 GUARD, ROTATING SCREEN W/KNOCKOUT101 0D7115 4 SCREW, #10 SHEET METAL RND WSHR HD

PH102 0D9684A 1 SCREEN, ROTATING103 0E2605 1 ASSY, GOVERNOR ROD104 0E1543 1 ASSY, IDLE SPEED ADJUSTMENT ROD105 0D9960 1 ROD, CHOKE106 0D1366 1 BUSHING, GOVERNOR ROD107 0E8388 4 NUT, HEX FLANGE WHIZ M6-1.0108 0D6021 4 STUD, M6-1.0 X 105 G5 ZINC109 0C9093A 1 HOSE, BREATHER 110 0D4612A 1 SNORKEL, AIR INTAKE111 0D2774B 1 BASE, AIRBOX112 0D2775 1 COVER, AIRBOX114 0E25480SRV 1 CARBURETOR (GT-990)115 0D4026 1 GASKET, CARB TO SPACER (GT-990)116 048031C 4 CLAMP HOSE BAND 1/4117 030340 12" HOSE ¼ ID118 0D4023 1 GASKET, MANIFOLD TO CARB (GT-990)119 086061G 1 SLEEVING 1/2" ID X 3" LG120 0D6313 1 FILTER, FUEL121 070008 4 WASHER FLAT M8 122 070006 4 WASHER LOCK M8123 049821 4 SCREW SHC M8-1.25 X 30124 0C9911 1 MANIFOLD, INTAKE125 0E9210 1 SCREW, HHC M5-0.8 X 12 W/NYLON126 049226 1 WASHER, LOCK M5127 0D3876 1 WASHER, FLAT M5 SS128 0D9884A 1 ASSEMBLY, IDLE SPEED ADJ. W/ HELPER129 0E1150 1 SPRING, GOVERNOR130 0E6043 2 SCREW, THTT M5-0.8 X 8mm ZP 131 0D8275 1 PANEL, CONTROL V-TWIN HZ132 045756 21 SCREW TAPTITE M6-1.0X 10 YELLOW

CHROME133 0D1142A 1 WRAPPER, LOWER CYLINDER 2 134 0D1143 1 WRAPPER, UPPER CYLINDER 2135 0F1177 1 ASSEMBLY, GROUND WIRE136 022097 5 WASHER LOCK M6-1/4137 092079 8 SCREW TAPTITE M6-1.0 X 25 BP138 0F1338B 1 ASSY, IGN COIL W/DIODE NO ADV139 0C4147 1 PUMP, IMPULSE140 022264 2 WASHER LOCK M4141 0D6142 2 SCREW PPHM M4-0.7 X 40142 0D5399A 1 ELBOW, RUBBER 90 DEG.143 0E7585 2 SPARK PLUG144 0E42710ESV 1 STARTER KIT145 022129 3 WASHER LOCK M8-5/16146 061906 2 SCREW HHC M8-1.25 X 85 G8.8148 0F5467 1 NUT HEX M8-1.25 YELLOW ZINC149 0F1169J 1 HOUSING, BLOWER REPOWER L&G

ITEM PART NO. QTY. DESCRIPTION

150 0C9763 4 NUT, GROMMET 1/4 PLUG151 0C3034 1 NUT,HEX M24152 0C3033 1 WASHER, BELLEVILLE 25MM BOLT153 0C3032 1 PLATE, FAN 154 0A5992 2 WASHER SHAKEPROOF INT M8 SS155 048571 2 SCREW HHC M8-1.25 X 10 G8.8156 0C3031 1 FAN, NYLON157 0E4997 1 CONNECTOR, GROUND WIRE158 045756 4 SCREW TAPTITE M6-1X10 YELLOW CHROME159 0C91820SRV 1 FLYWHEEL ASSEMBLY160 0F1170C 1 PLATE, BACKING GT990 WITH REG. CUTOUT161 082774 1 KEY, WOODRFF 4 X 19D162 0C3043 2 GASKET, MANIFOLD / PORT 163 0C9764 4 PLASTITE,1/4-15 X 3/4164 0C3026 1 COOLER, OIL 165 0F6301 4 CLAMP, HOSE OETIKER 16.5mm166 0C9806 2 HOSE, 3/8" I.D. X 6" LONG 167 035461 2 BARBED STR 1/4NPT X 3/8168 070185B 1 FILTER, OIL BLACK 75mm LONG169 0C7292 1 NIPPLE, 3/4"-16 UNF171 0C3025 1 SWITCH, OIL PRESS 172 0C3018 1 WRAPPER, UPPER CYLINDER 1 173 0C3019 1 WRAPPER, LOWER CYLINDER 1 174 0A2702 1 REGULATOR, VOLTAGE (20 A)175 0E1488 1 SPRING, EFFORT REDUCTION176 0F1153B 1 STATOR, OUTLINE W/LUGS-14.25"177 0E1908 1 ROD, IDLE ADJUSTMENT178 0C7265 1 KNOB, VARIABLE SPEED179 0C7264A 1 KNOB, CHOKE180 0E4190 3 CLAMP, 3/16" COATED CABLE181 0F5579 3 SCREW, HHC W/SHLDR M5-0.8 X 20182 0C8566 4 SCREW, HHHC M6-1.0 X 20183 0E0194 1 ASSY, GOVERNOR LEVER W/ GROMMET184 0D3868 1 BRACKET, GOVERNOR ADJ. SUPPORT185 052859 1 NUT, HEX LOCK M10-1.5186 0E0486 1 SCREW, SHC M10-1.5 X 75 G10.9187 0E0553 1 ASSEMBLY, IDLE SPEED BRKT W/GROMMET188 0D4511 1 PRECLEANER, AIR189 0D9723 1 ELEMENT, AIR CLEANER190 0E5302 1 STUD, AIR FILTER M6-1.0 X 73191 0D4183 1 ADAPTOR, SPIT BACK192 0D6327 1 GASKET, SPITBACK193 0D5014A 1 KNOB, AIRBOX 17mm194 0D5014B 1 KNOB, AIRBOX 95mm195 038750 1 SCREW, HHC M6-1.0 X 30196 022097 1 WASHER LOCK M6-1/4197 022473 1 WASHER FLAT ¼198 051714 1 NUT, HEX M3-0.5 YC199 0D5411 1 ROD, SUMMER / WINTER VALVE200 0D2930 1 VALVE, WINTER / SUMMER201 0D5125 1 SPRING, WINTER / SUMMER VALVE202 0D5445 1 BUSHING, MINI CONTROL PANEL203 0D5416A 1 KNOB, CONTROL SUMMER / WINTER204 0E5113 1 WASHER NYLON 0.375" ID205 022145 1 WASHER, FLAT M8207 0D6147 2 SCREW, HHFC M6-1.0 X 10mm208 0F1338A 1 ASSY, IGN COIL W/DIODE NO ADV209 0D6143 1 TUBE, HEAT RISER 50.8 I.D.210 048031G 1 CLAMP, HOSE BAND

Models 004946-0, 004946-1 GTH990 OHVI SERIES ENGINE

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(MO

DE

L #0

0494

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(MO

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L #0

0494

6-1)

GTH990 OHVI SERIES ENGINE Models 004946-0, 004946-1

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ITEM PART NO. QTY. DESCRIPTION

220 0E6708A 1 SUPPORT, MUFFLER W/LIFT EYE-RH221 0E6708B 1 SUPPORT, MUFFLER W/LIFT EYE-LH222 0E8558 1 MUFFLER, GTH990/760223 022145 4 WASHER, FLAT 5/16-M8 ZINC224 039253 2 SCREW, HHC M8-1.25 X 20225 067989 2 NUT, HEX FL WHIZ M8-1.25226 0F1155A 1 ASSY, FUSE WIRE W/ RING LUG227 0F1150 1 HOUSING CONN PACKARD 56 SERIES228 0E7237 1 30 AMP FUSE

ITEM PART NO. QTY. DESCRIPTION

MODEL #04946-0229 0E3398 1 VS WIRE HARNESS

MODEL #04946-1230 0F0911 1 HS WIRE HARNESS, FUEL SHUTOFF231A 022471 1 NUT, HEX #8-32231B 022264 1 WASHER, LOCK #8-M4231C 043182 1 WASHER, LOCK M3231D 0C1085 1 SCREW, PPHM M3-0.5 X 8

Models 004946-0, 004946-1 GTH990 OHVI SERIES ENGINE

GTH990 OHVI SERIES ENGINE Models 004946-0, 004946-1

OIL RELEIF KIT — 0D40150SRVPART NO. QTY. DESCRIPTION0C3009 2 SPRING, OIL RELIEF0C3010 2 BALL, 1/2D OIL RELIEF0C3011 2 COVER, OIL RELIEF

SUMP KIT ASSEMBLY — 0D40160SRVPART NO. QTY. DESCRIPTION0C2988 1 THRUST WASHER0C2991 2 E-RING, GOVERNOR ARM0C2992 1 BUSHING, GOVERNOR LOWER0C3009 2 SPRING, OIL RELIEF0C3010 2 BALL, 1/2D OIL RELIEF0C3011 2 COVER, OIL RELIEF0D1667 1 ARM, GOVERNOR0E9842 1 SEAL CRANKSHAFT PTO SIDE090388 4 SCREW, HHTT M6-1.0 X 12 ZINC0C5998 1 CLAMP, OIL TUBE

GASKET KIT — 0D40100ESVPART NO. QTY. DESCRIPTION0C2977 1 GASKET, C’CASE0C2978 2 GASKET, CYLINDER HEAD0C2979 2 GASKET, VALVE COVER0C2993 1 SEAL, GOVERNOR SHAFT0C3005 1 GASKET, BREATHER COVER0C3043 2 GASKET, INTAKE PORT0C4138 2 GASKET, EXHAUST PORT0C5943 1 SEAL, OIL PASSAGE0D4026 1 GASKET, CARB TO SPACER0D4023 1 GASKET, MANIFOLD TO CARB0E9842 1 SEAL CRANKSHAFT PTO SIDE0E9843 1 SEAL CRANKSHAFT FLYWHEEL SIDE0C3027 1 O-RING, 9/16 X 3/8” X 1/2”

BREATHER ASSEMBLY KIT — 0D40120SRVPART NO. QTY. DESCRIPTION0C3005 1 GASKET, BREATHER COVER0C5372 1 ASSY, BREATHER0E3372B 1 SEPARATOR, OIL BREATHER

GOVERNOR KIT ASSEMBLY — 0E27430SRVPART NO. QTY. DESCRIPTION0A7811 1 SPOOL, GOVERNOR MACHINED0C2985A 2 BEARING ROLLER GOV TOP0C2985B 1 BEARING ROLLER GOV W/ROLLERS0E2743 1 ASSY, GOV GEAR-LIGHT FLYWGT

HEAD ASSEMBLY KIT - CYL #1 —0D8675ASRV

PART NO. QTY. DESCRIPTION0C2229 1 VALVE, INTAKE0C2976 6 SCREW, HHFC M8-1.25 X 650C2978 1 GASKET, CYLINDER HEAD0C2979 1 GASKET, VALVE COVER0C3043 2 GASKET, INTAKE PORT0C4138 2 GASKET, EXHAUST PORT0C5371 2 WASHER, VALVE SPRING0D2274 2 RETAINER, VALVE SPRING0D3867 2 SPRING, VALVE0D3998 2 NUT, HEX M8-1.0 G8 YEL CHR0D5313 2 ROCKER ARM0D6024 1 PLATE, PUSH ROD GUIDE0D8067A 1 ASSY, CYL HEAD GUIDES & SEATS CYL 10D9853D 2 PUSHROD 147 LENGTH072694 1 STUD, ROCKER ARM PIVOT078672 1 SEAL, VALVE STEM D7086515 2 KEEPER, VALVE SPRING (SET OF 2)086516 1 VALVE, EXHAUST

HEAD ASSEMBLY KIT - CYL #2 —0D8675BSRV

PART NO. QTY. DESCRIPTION0C2229 1 VALVE, INTAKE0C2976 6 SCREW, HHFC M8-1.25 X 650C2978 1 GASKET, CYLINDER HEAD0C2979 1 GASKET, VALVE COVER0C3043 2 GASKET, INTAKE PORT0C4138 2 GASKET, EXHAUST PORT0C5371 2 WASHER, VALVE SPRING0D2274 2 RETAINER, VALVE SPRING0D3867 2 SPRING, VALVE0D3998 2 NUT, HEX M8-1.0 G8 YEL CHR0D5313 2 ROCKER ARM0D6024 1 PLATE, PUSH ROD GUIDE0D8067B 1 ASSY, CYL HEAD GUIDES & SEATS CYL 20D9853D 2 PUSHROD 147 LENGTH072694 1 STUD, ROCKER ARM PIVOT086515 2 KEEPER, VALVE SPRING (SET OF 2)086516 1 VALVE, EXHAUST

PISTON KIT — 0E29500SRVPART NO. QTY. DESCRIPTION0E1466 2 PIN, PISTON 20 DIA X 480E2950 2 PISTON, 8.5:1 90MM DIA LOW COMPR021533A 2 RING, PISTON TOP 90MM021533B 2 RING, PISTON 2ND 90MM021533C 4 RING, OIL RAIL 90MM021533D 2 RING, OIL SPACER 90MM071983 4 RETAINER, PISTON PIN 20

Manual No. 0F6917 Revision 0 (05/13/05) Printed In U.S.A.