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 188 of 836

TM 9-2320-272-24-4

5-27. CAMSHAFT AND GEAR MAINTENANCE (Contd)

6.

7.

8.

Using prybar between two vibration damper screws (1), rotate crankshaft (2).

Press in timing pin (15), while rotating crankshaft (2), until timing pin (15) engages camshaft

gear (3).

Remove access plug (9), copper washer (8), and fuel injection pump timing pin (10) from fuel

injection pump (11).

9.

Install nut (4) on fuel injection pump shaft (12) and rotate until timing tooth (14) is visible in timing

pin hole (13).

10.

11.

12.

Install fuel injection pump timing pin (10) in hole (13). Ensure slot (7) of fuel injection pump timing

pin (10) is positioned over timing tooth (14).

Install copper washer (8) and access plug (9) on fuel injection pump (11).

Remove nut (4) from fuel injection pump shaft (12).

NOTE

Do not exceed torque limit for fuel injection pump drive gear nut.

Torque is not the final limit.

13.

Install drive gear (6) on fuel injection pump shaft (12) with new lockwasher (5) and nut (4). Tighten

nut (4) 7-11 lb-ft (10-15 N•m).

14.

15.

16.

Disengage timing pin (15) from camshaft gear (3).

Remove access plug (9), copper washer (8), and timing pin (10) from fuel injection pump (11).

Install timing pin (10) in fuel injection pump (11) with slot (7) facing outward from fuel injection

pump (11).

17.

Install copper washer (8) and access plug (9) on fuel injection pump (11).

18.

Using prybar between two vibration damper screws (1), tighten nut (4) 80 lb-ft (109 N•m).

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