TM-9-2320-272-24-2

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4

JUNE 1998

TM-9-2320-272-24-2 - Page 844 of 991

TM 9-2320-272-24-2

4-20. ROCKER LEVER HOUSING AND PUSH TUBES (M939/A1) MAINTENANCE (Contd)

2.

3.

4.

5.

6.

7.

8.

9.

Install three new gaskets (7) and rocker lever housings (6) on cylinder heads (8) and align push

tubes (9) with rocker levers.

Install upper radiator support bracket (1) and two lifting eyes (3) on rocker lever housings (6) with

six screws (2). Finger-tighten screws (2).

NOTE

Rocker lever housings are mounted using screw-assembled

lockwashers on late model engine.

Install twelve washers (5) and screws (4) on rocker lever housings (6) and cylinder heads (8).

Tighten screws (2) and (4) 50-65 lb-ft (68-88 N•m) in sequence shown.

Install three new gaskets (17) and rocker lever housing covers (18) on three rocker lever housings (6)

with fifteen screws (16). Tighten screws (16) 10-15 lb-ft (14-20 N•m).

Connect breather hose (20) to breather (19) with hose clamp (21).

NOTE

Perform step 7 for late model engine only.

Connect breather hose (23) to breather (19) and elbow (24) with two clamps (22).

NOTE

l

Perform steps 8 for no. three rocker lever housing cover only.

l

Assistant will help with step 8.

Turn left and right screw jacks (15) at the same time and lower cab on frame (11). Ensure clearance

between cab A-post (10) and jack screw (15) is 1-2 in. (25-50 mm).

Install two rubber cushions (12) on left and right cab A-posts (10) with two washers (13) and new

locknuts (14).

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