Figure 4-23. Engine Valve Train and Camshaft Group, Exploded View

TM 10-3930-623-34

1. Intake Valve

2. Exhaust Valve

3. Exhaust Valve Seat

Insert

4. Valve Guide

5. Valve Spring

6. Retainer

7. Retainer Lock

8. Valve Tappet

9. Camshaft Gear

10. Nut

11. Woodruff Key

12. Thrust Plate

13. Screw

14. Lock Washer

15. Camshaft Front Bushing

16. Camshaft Intermediate

Front Bushing

17. Camshaft Intermediate

Rear Bushing

18. Camshaft Rear Bushing

19. Camshaft

Figure 4-23. Engine Valve Train and Camshaft Group, Exploded View

5. Remove valve springs (5) and spring retainers

(6) from valve chamber.

6. Remove tappets (8) from cylinder block. Tag

tappets for replacement in holes from which they were

removed.

4-89. TIMING GEAR COVER ASSEMBLY.

4-90. REMOVAL. Remove screws and hollow dowels

securing the timing gear cover (2, figure 4-25) to the

cylinder block and remove cover assembly.

4-91. DISASSEMBLY.

NOTE

Examine both fan drive assembly and

governor control lever and shaft

assembly

determine

disassembly is required.

1. Remove three screws attaching fan

drive

assembly (52 figure 4-18) to timing gear cover.

2. Remove drive assembly (52) and roll pin.

3. Using suitable pullers remove drive gear and

pulley with keys. Remove shaft bearings.

Figure 4-24. Removing and Replacing Valve Retainer

Locks

4-28