TM 9-2320-272-24-3
4-46. FRONT GEARCASE HOUSING AND TIMING PIN MAINTENANCE
THIS TASK COVERS:
d. Timing Pin Installation
a. Front Gearcase Housing Removal
e. Front Gearcase Housing Installation
b. Timing Pin Removal
c. Cleaning and Inspection
INITIAL SETUP:
REFERENCES (TM)
APPLICABLE MODELS
TM 9-2320-272-24P
M939A2
EQUIPMENT CONDITION
SPECIAL TOOLS
Engine mounted on repair stand (para. 4-9).
Engine barring tool (Appendix E, Item 43)
Rocker levers and pushrods removed (para. 4-41).
TOOLS
Vibration damper removed (para. 4-42).
General mechanic's tool kit (Appendix E, Item 1)
Front gearcase cover removed (para. 4-48).
Torque wrench (Appendix E, Item 144)
Fuel injection pump removed (para. 4-57).
MATERIALS/PARTS
O-ring (Appendix D, Item 445)
Gasket (Appendix D, Item 191)
Gasket (Appendix D, Item 192)
Sealing compound (Appendix C, Item 68)
Antiseize compound (Appendix C, Item 10)
Gasket compound (Appendix C, Item 29)
a. Front Gearcase Housing Removal
NOTE
Assistant will help with step 1.
1.
Locate Top Dead Center (TDC) for cylinder No. 1. While turning engine, push down on timing
pin (2) until timing pin (2) enters hole (3) in camshaft (1).
2.
Remove four screws (13), washers (14), and front engine mount (15) from gearcase housing (5).
3.
Remove four front oil pan screws (11), washers (10), and washers (9) from gearcase housing (5) and
oil pan (12).
4.
Remove twenty-four screws (4), gear housing (5), and gasket (6) from engine block (7). Discard
gasket (6).
b. Timing Pin Removal
1.
Remove ring (19), timing pin (2), and O-ring (18) from timing pin housing (17). Discard O-ring (18).
2.
Remove two torx screws (20), timing pin housing (17), and gasket (16) from gearcase housing (5).
Discard gasket (16).
c. Cleaning and Inspection
1.
For general cleaning instructions, refer to para. 2-14.
2.
For general inspection instructions, refer to para 2-15.
3.
Repair or replace all parts failing inspection.
4.
Inspect oil pan gasket (8) for tears. If torn, replace oil pan gasket (8) (para. 4-47).
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