TM 9-2320-272-24-2
4-17. CRANKSHAFT REAR COVER AND SEAL REPLACEMENT
THIS TASK COVERS:
b. Installation
a. Removal
INITIAL SETUP:
REFERENCES (TM)
APPLICABLE MODELS
TM 9-2320-272-24P
M939/A1
EQUIPMENT CONDITION
TOOLS
Flywheel housing removed (para. 4-16).
General mechanic's tool kit (Appendix E, Item 1)
MATERIALS/PARTS
Rear cover plate gasket (Appendix D, Item 526)
Rear cover plate seal (Appendix D, Item 527)
O-ring (Appendix D, Item 439)
Fourteen screw-assembled lockwashers
(Appendix D, Item 588)
1.
Remove four screw-assembled lockwashers (2) from oil pan (1). Discard screw-assembled
lockwashers (2).
2.
Remove ten screw-assembled lockwashers (4), O-ring retainer (7), retainer gasket (6), cover seal (5),
cover plate (3), and cover plate gasket (9). Discard seal (5), O-ring retainer gasket (6), and plate
gasket (9).
3.
Remove O-ring (8) from O-ring retainer (7). Discard O-ring (8).
b. Installation
Install new cover plate gasket (9) and cover plate (3) on cylinder block (10) with four new screw-
1.
assembled lockwashers (4). Do not tighten.
Install O-ring retainer (7) and gasket (6) over end of crankshaft (11) with six new screw-assembled
2.
lockwashers (4). Do not tighten.
NOTE
Perform steps 3 and 4 to check cover plate runout.
Position dial indicator on end of crankshaft (11) and indicator arm (12) to outside edge of O-ring
3.
retainer (7).
Rotate crankshaft (11) and read dial indicator to align cover plate (3). Cover plate (3) must be
4.
aligned within 0.005 in. (0.127 mm).
Tighten ten screw-assembled lockwashers (4) 24-29 lb-ft (33-39 N-m).
5.
Install new rear cover seal (5) into rear cover plate (3) over rear end of crankshaft (11).
6.
Install new O-ring (8) over O-ring retainer (7).
7.
Install four screw-assembled lockwashers (2) in oil pan (1). Alternately tighten screw-assembled
8.
lockwashers (2) 15-20 lb-ft (20-27Nm).
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