INTAKE AND EXHAUST VALVE CLEARANCE CHECK AND ADJUSTMENT - continued

TM 9-2320-386-24-1-2

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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.

Remove plug (4) and O-ring (3) from timing hole (2) on flexplate housing (1).

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.

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.

Using feeler gauge, check intake and exhaust valve clearance between rocker arm (6) and valve (5).

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).

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).

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