TM 9-2320-272-24-3
4-42. VIBRATION DAMPER MAINTENANCE
THIS TASK COVERS:
a. Removal
c. Installation
b. Inspection
INITIAL SETUP:
APPLICABLE MODELS
PERSONNEL REQUIRED
M939A2
Two
SPECIAL TOOLS
REFERENCES (TM)
Engine barring tool (Appendix E, Item 43)
TM 9-2320-272-10
TM 9-2320-272-24P
TOOLS
EQUIPMENT CONDITION
General mechanic's tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 144)
Parking brake set (TM 9-2320-272-10).
Engine drivebelt removed (para. 3-71).
MATERIALS/PARTS
Fan and fan shroud removed (para. 3-64).
O-ring (Appendix D, Item 444)
NOTE
Assistant will help with this procedure.
a. Removal
1.
Remove plug (4) and O-ring (3) from flywheel housing (2). Discard O-ring (3).
2.
Using engine barring tool, prevent crankshaft (1) from turning.
3.
Remove four screws (6) and vibration damper (5) from crankshaft (1).
b. Inspection
1.
Inspect vibration damper (5) for bends, breaks, and damaged pulley grooves. Replace vibration
damper (5) if bent, broken, or grooves are damaged.
2.
Inspect vibration damper alignment marks (8). Replace vibration damper (5) if alignment
marks (8) are 0.063 in. (1.60 mm) out of alignment.
3.
Inspect rubber member (7) for wear and damage. Replace vibration damper (5) if damaged or worn
more than 0.125 in. (3.18 mm) deeper than face of vibration damper (5).
c. Installation
1.
Using engine barring tool, prevent crankshaft (1) from turning.
2.
Install vibration damper (5) on crankshaft (1) with four screws (6). Tighten screws (6) 150 lb-ft
(203 Nm).
3.
Install new O-ring (3) and plug (4) in flywheel housing (2).
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