TM 9-2320-272-24-2
4-4. POWER PLANT (M939/A1) REPLACEMENT (Contd)
NOTE
Front of cab must be raised 4 in. (102 mm) to permit engine oil pan
sump to clear the front axle differential housing. Two permanently
mounted jack screws under the left and right cab A-posts permit
raising front of cab.
Remove two locknuts (5), washers (4), and rubber cushions (3) from cab A-post support brackets (2).
2.
Discard locknuts (5).
Turn left and right jack screws (6) until A-posts (1) are approximately 4 in. (102 mm) above support
3.
brackets (2).
WARNING
Lifting device must have a weight capacity greater than the
combined weight of the engine and transmission to prevent injury or
death to personnel and damage to equipment.
Attach the adjustable end of an adjustable chain hoist to hoist hook and each adjustable chain hoist
4.
hook to engine lifting eyes (8). Raise hoist until all slack is removed from adjustable chain hoist,
ensuring that hoist does not support weight of engine (7).
Remove two screws (11), lockwashers (10), five screws (13), lockwashers (14), trunnion cap (9), and
5.
trunnion mount (12) from frame crossmember (15). Discard lockwashers (10) and (14).
Remove two nuts (20), lockwashers (21), screws (16), and washers (17) from left and right engine
6.
supports (19) and flywheel housing (18). Discard lockwashers (21).
WARNING
All personnel not participating in engine removal must stand
clear during hoisting operations. A snapped cable, or swinging or
shifting load, may cause injury to personnel.
Do not use hands to free engine of hangups. Use tanker or
prybars to avoid injury to personnel.
CAUTION
Always remove engine slowly. Lift out of chassis in short lifts and
closely observe all engine and transmission attachments during
removal to prevent damage to equipment.
NOTE
Mechanic will direct all hoisting operations in steps 7 through 10
while assistant operates hoist or assists mechanic.
Chain hoist must be adjusted to lower rear of transmission
downward so engine is suspended at approximately a 15-20
degree angle to clear front axle.
7.
Using socket wrench, adjust engine angle to 15-20 degrees with adjustable chain hoist.
Lift engine (7) slowly upward until clear of vehicle.
8.
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