TM 9-2320-272-24-2
4-4. POWER PLANT (M939/A1) REPLACEMENT (Contd)
NOTE
For steps 2 through 4, if engine is removed in the field, an
additional assistant will be needed to operate the wrecker
crane. Shop removal of engine requires a mechanic and one
assistant if overhead hoist is available.
Chain hoist must be adjusted so transmission points downward at
approximately a 15-20 degree angle for engine to clear front axle.
2.
Install trunnion mount (8) on frame crossmember (11) with five new lockwashers (10) and screws (9).
Do not tighten screws (9).
3.
Raise engine (1) and transmission (2) over front bumper (4) directly above engine compartment (3).
4.
Using socket wrench, adjust engine angle to 15-20 degrees with adjustable ratchet on lifting device.
5.
Slowly lower engine (1) and transmission (2) into engine compartment (3).
6.
Lower engine (1) and transmission (2) until resting on trunnion mount (8) and left and right rear
engine supports (15).
7.
Using a drift pin, align holes in left and right rear engine supports (15) and engine flywheel
housing (14), and install two washers (13), screws (12), new lockwashers (17), and nuts (16). Tighten
nuts (16) 140-160 lb-ft (190-217 Nm).
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