TM-9-2320-272-24-4

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4

JUNE 1998

TM-9-2320-272-24-4 - Page 187 of 836

TM 9-2320-272-24-4

5-27.

CAMSHAFT AND GEAR MAINTENANCE (Contd)

f. Installation

NOTE

• Used valve must be installed in mating tappet bores. If valve

tappet position was not noted during removal, replace all valve

tappets.

• Do not reuse old valve tappets if installing new camshaft.

1.

Rotate crankshaft (10) as necessary to access tappet bores (8).

2.

Coat twelve tappets (2) with GAA grease and install in tappet bores (8).

CAUTION

Use care when installing camshaft. Camshaft and bushings are

easily damaged.

3.

Apply coat of GM grease to camshaft (4) and install in engine block (7). Ensure timing marks (13)

of camshaft gear (6) and crankshaft gear (9) are aligned.

4.

Install camshaft support (11) on engine block (7) with two screws (12). Tighten screws (12) 18 lb-ft

(24 N•m).

5.

Check backlash and end play of camshaft (4) for proper seating (task a).

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