Printed in Canada

Service Bulletin No.2912MODEL TYPE SECTION/GROUP DATE

SUBJECT

CONDITIONS

Aug. 30, 2005E / J Series Coaches Product Improvement 8--Engine

BELT TENSIONERS

Parts may be purchased from MCI Service Parts, Louisville, Kentucky or from MCIService Parts, Newcastle, Ontario.

Description:Effective with unit number 63276, MCI made design changes to the fan belt tensioner installation. This design change,which provides a more robust tensioner, will improve the reliability and performance of the fan belt and A/C tensionerinstallation.

S60 Parts For Fan Belt TensionerQty. Old P/N New P/N Description1 06-06-1081 Tensioner-Fan, Belt, S601 06-06-1191 Kit - Fan Belt Tensioner, S60, 3/4 Ball

Kit Contents are:1 06-06-1173 Tensioner-Fan, Belt, 3/4 Ball3 06-06-1182 Spacer, Belt Tensioner2 06-06-1183 Spacer, Belt Tensioner2 19-01-1655 Capscrew-Hex, 5/8-18 x 2.50, GR. 82 19-03-0509 Nut, 5/8-182 06-06-1184 Bushing-Fan Clutch

S60 Parts For A/C Belt TensionerQty. Old P/N New P/N Description1 16-02-1116 Tensioner-A/C, Belt, S601 16-02-1141 Tensioner-A/C, Belt, S60, 3/4 Ball2 06-06-1182 Spacer, Belt Tensioner2 06-06-1183 Spacer, Belt Tensioner2 19-1-552 Capscrew-Hex, 5/8-18 x 2.25, GR. 82 19-03-0509 Nut, 5/8-18

C13 Parts For Fan Belt TensionerQty. Old P/N New P/N Description1 06-06-1081 Tensioner-Fan, Belt, C131 06-06-1191 Kit - Fan Belt Tensioner, 3/4 Ball

Kit Contents are:1 06-06-1173 Tensioner-Fan, Belt, 3/4 Ball3 06-06-1182 Spacer, Belt Tensioner2 06-06-1183 Spacer, Belt Tensioner2 19-01-1655 Capscrew-Hex, 5/8-18 x 2.50, GR. 82 19-03-0509 Nut, 5/8-182 06-06-1184 Bushing-Fan Clutch

C13 Parts For A/C Belt TensionerQty. Old P/N New P/N Description1 16-02-1125 Tensioner-A/C, Belt, C131 16-02-1145 Tensioner-A/C, Belt, C13, 3/4 Ball2 06-06-1182 Spacer, Belt Tensioner2 06-06-1183 Spacer, Belt Tensioner2 19-1-552 Capscrew-Hex, 5/8-18 x 2.25, GR. 81 19-03-0509 Nut, 5/8-18

Printed in Canada

PAGEDATE 2AUG. 30, 2005Service Bulletin No. 2912

Service Information:1. Old and new parts are interchangeable.2. Both old and new parts will be available for service replacement.

Service Procedure:General notesRead this entire procedure before beginning work.Use Safe Shop Practices At All Times.

1. Turn the main battery disconnect switch to the OFF position. Chock both sides of the tires.2. Open the rear, side service compartment door and pull the rear engine service compartment door releaselever. Open the rear engine service compartment door. Position the ENG RUN and ENG START switcheson the remote electrical control panel to the OFF position.

3. Remove bumper. Place aside to be re-installed at a later step in this procedure.4. Loosen the belt tensioner jam nuts and relax the fan belt and A/C belt tensioner. Remove fan belt and A/Cbelt. Remove and discard existing belt tensioner link.

5. Remove and retain the capscrew and nut from the fan clutch mount bracket assembly. Remove the fanclutch mount bracket assembly.

6. Carefully remove and discard existing bushings from fan clutch mount bracket assembly.

remove and retain capscrew and nutfrom fan clutch mount bracket assembly

removeexistingbushing

Figure 1.

7. Press fit the new bushings ( part number 06-06-1184 ) into the fan clutch mount bracket assembly using a1 3/4 inch driver.

8. Re-install the fan clutch mount bracket assembly, using the capscrew and nut removed in Step 5.Torque nut to 94 ft.-lbs.

Printed in Canada

PAGEDATE 3AUG. 30, 2005Service Bulletin No. 2912

NOTEUse a drill stop to prevent damage to coach components when drilling.

9. The existing inboard tensioner mounting holes will require modification.a. On S60 equipped coaches: using a 41/64 inch drill bit, drill out the existing holes in the location Ashown in Figure 2.

b. On C13 equipped coaches: using a 35/64 inch drill bit, drill out the existing holes in the location Ashown in Figure 2. Tap the hole using a 5/8---18 UNF tap.

NOTEUse a bottoming tap as required.

c. Using a 41/64 inch drill bit, drill out the existing holes in the location B shown in Figure 2.

fan belt tensionerdrill hole locations

A/C belt tensionerdrill hole locations

A

A

B

B

Figure 2. Reference photo.

10. Install the fan belt and A/C belt tensioner as per Figures 3 to 6.a. On S60 equipped coaches: torque nut to 138---166 ft.-lbs. ( Location A )b. On C13 equipped coaches: torque capscrew to 132---160 ft.-lbs. ( Location A )c. Torque nut to 138---166 ft.-lbs. ( Location B )

Printed in Canada

PAGEDATE 4AUG. 30, 2005Service Bulletin No. 2912

Figure 3. Fan drive installation.

19--03--0509

06--06--1182

19--01--1655

DETAIL A

TYP BOTH ENDS

06--06--1183

DETAIL A

Figure 4. Fan drive installation.

Printed in Canada

PAGEDATE 5AUG. 30, 2005Service Bulletin No. 2912

Figure 5. A/C tensioner installation.

19--03--050906--06--1182

19--1--552

DETAIL A

TYP BOTH ENDS

06--06--1183

DETAIL A

Figure 6. A/C tensioner installation.

Printed in Canada

PAGEDATE 6AUG. 30, 2005Service Bulletin No. 291211. Tension the fan drive and A/C belts to the deflections outlined on the decal located inside of the enginedoor.

12. When the belt is properly tensioned, tighten the jam nuts.13. Place a straight edge across the face of the crankshaft pulley. If required, adjust the fore/aft position of thefan clutch to achieve proper alignment between the crankshaft pulley and the face of the fan clutch ( Figure7 ).

14. Place a straight edge across the face of the fan clutch only. Visually inspect to ensure that the distancebetween the straight edge and the belt is consistent along the length of the belt. If required, adjust the fanclutch.

15. Re--- inspect the fore/aft position and alignment of the fan clutch per Steps 13. and 14.

fan clutch

crankshaft pulley

Figure 7.

16. Re-install the bumper.17. Position the ENG RUN and ENG START switches to the ON position. Close the rear, side servicecompartment and rear engine service compartment doors.

NOTECheck and adjust belts after 200 miles ( 300 km ) and again after 2,000 miles ( 3,000 km ).

Procedure complete.