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TM 10-4320-348-14
4.32 VALVE ROCKER ARM ASSEMBLY ADJUSTMENT.
This task covers:
a) Removal
b) Inspection
c) Adjust
d) Installation
INITIAL SETUP
Tools
Equipment
Tool Kit, General Mechanics
Condition
(Appendix B, Section III, Item 1)
Para
4.28 Flywheel and cooling case cover removed.
Materials/Parts
Fuel, Diesel (Appendix E, Section II, Item 2)
Cloth, Lint-free (Appendix E, Section II, Item 6)
Gasket Rocker Arm Cover (Appendix I, Section II,
Item 17)
a.
Removal. (Refer to Figure 4-25)
(1)
Remove two bolts (1) holding rocker arm cover (2) to cylinder head.
(2)
Remove rocker arm cover (2) and gasket; discard gasket (3).
b.
Inspection.
Check for loose carbon, oil deposits, or caked din. Use clean, lint-free cloth dipped in diesel fuel to clean area of
rocker arm assembly. Wipe dry when thoroughly clean.
c.
Adjust.
NOTE
Valve clearance should be adjusted when engine is cold.
(1)
Turn flywheel so "T" (4) mark on flywheel aligns with alignment mark (5) on cylinder block. (Alignment mark
is a notch in the cooling fins).
(2)
Slightly rotate flywheel (approximately 20 degrees in both directions). If valves move up and down, this is
the exhaust top dead center. Do not adjust the valve clearance with the flywheel in this position.
(3)
Give flywheel another turn until "T" mark on flywheel aligns with alignment mark on cylinder block. Slightly
rotate flywheel (approximately 20 degrees in both directions). If valves do not move up and down, the
flywheel is in correct position to check valve clearance.
(4)
Check that "T" mark (4) and alignment mark (5) are aligned correctly.
(Refer to Figure 4-26)
(5)
Insert screwdriver into adjusting screw (1) and loosen locknut (2) using wrench.
(6)
Turn screwdriver counterclockwise to obtain a clearance. Move valve lever inside for adjustments.
4-57
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