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INTAKE AND EXHAUST VALVE CLEARANCE CHECK AND ADJUSTMENT
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/.5ton/TM-9-2320-386-24-1-2 Extended Service Program (ESP) for 2-1/2-Ton 6x6 M44A3 Series Trucks (Diesel) Manual
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Table 1. Crankshaft Positions for Valve Clearance Setting.
TM 9-2320-386-24-1-2
0311 00
INTAKE AND EXHAUST VALVE CLEARANCE CHECK AND ADJUSTMENT (Contd)
CHECK
.WARNING.
Diesel fuel is flammable. Do not perform fuel system procedures
near open flame. Injury to personnel may result.
CAUTION
Engine must be at ambient temperature prior to valve clearance
check and adjustment.
NOTE
Valve clearance check is measured between the rocker arm and
valve. All clearance measurements and adjustments are made
with applicable valves fully closed.
1.
Remove plug (4) and O-ring (3) from timing hole (2) on flexplate housing (1).
2.
Install timing bolt in timing hole (2) on flexplate housing (1).
NOTE
When turning the crankshaft, finger-tighten adjusting screws to
properly seat push rods in ball of adjusting screws.
When turning the crankshaft, use the four large screws on the
front of the crankshaft. Do not use the eight small screws on the
front of the crankshaft pulley.
No. 1 piston is on compression stroke if intake and exhaust valves
are closed and rocker arms can be moved by hand.
No. 1 piston is on exhaust stroke if intake and exhaust valves are
open and rocker arms cannot be moved by hand.
3.
Turn crankshaft clockwise until timing bolt engages non-threaded hole in flywheel.
NOTE
Refer to table 1, Crankshaft Positions for Valve Clearance Setting,
to make adjustments to valves at the correct stroke.
4.
Using feeler gauge, check intake and exhaust valve clearance between rocker arm (6) and valve (5).
a.
Intake valve clearance should be 0.012-0.018 in. (0.30-0.46 mm). If clearance is not within
limits, adjust valve(s) (adjustment task).
b.
Exhaust valve clearance should be 0.022-0.028 in. (0.56-0.71 mm). If clearance is not within
limits, adjust valve(s) (adjustment task).
0311 00-2

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