a. Remove two bolts (1) holding rocker arm cover (2) to cylinder head
b. Remove rocker arm cover (2) and gasket, discard gasket
Check for loose carbon, oil deposits, or caked dirt Use clean, lint-free cloth dipped in diesel fuel to clean area of
rocker arm assembly Wipe dry when thoroughly clean
Valve clearance should be adjusted when engine Is cold.
a. Turn flywheel so "T" mark on flywheel aligns with alignment mark on cylinder block.
b. 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.
c. 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.
d. Check that "T" mark and alignment mark are aligned correctly.
e. Insert screwdriver into adjusting bolt and loosen locknut Refer to Figure 4-17 f Turn screwdriver counterclockwise
to obtain a clearance. Move valve lever inside for adjustments.
g. Insert feeler gauge between valve rocker arm and top of the valve spring cotter