TM 9-2320-272-24-1
THIS TASK COVERS:
a. Removal (Internal Bypass)
d. Removal (External Bypass)
b. Cleaning and Inspection (Both Types)
e. Installation (External Bypass)
c. Installation (Internal Bypass)
APPLICABLE MODELS
REFERENCES (TM)
TM 9-2320-272-10
M939A2
TM 9-2320-272-24P
TOOLS
EQUIPMENT CONDITION
General mechanic's too kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 146)
Parking brake set (TM 9-2320-272-10).
Hood raised and secured (TM 9-2320-272-10).
MATERIALS/PARTS
Drivebelt tensioner removed (para. 3-71)
Gasket (Appendix D, Item 148)
GENERAL SAFETY INSTRUCTIONS
Gasket (Appendix D, Item 149)
Gasket (Appendix D, Item 150)
Do not drain coolant when engine is hot.
Gasket (Appendix D, Item 151)
Gasket (Appendix D, Item 152)
Seal (Appendix D, Item 598)
Antiseize tape (Appendix C, Item 72)
NOTE
There are two different bypass systems used for M939A2 engines.
An identifiable difference is the thermostat housing for external
bypass and internal bypass engines.
Do not drain coolant when engine is hot. Severe bums to
personnel may result.
1.
Drain three quarts of coolant from oil cooler drainvalve (11) into container.
2.
Loosen clamp (3) and remove hose (2) from adapter (4).
3.
Loosen alternator link screw (12).
4.
While supporting alternator (15), remove two screws (13) and washers (14) from bracket (16). Pivot
alternator (15) down and move bracket (16) aside.
5.
Remove four screws (17) and bracket (18) from thermostat housing (7).
NOTE
Tag screws for identification in installation.
6.
Remove two screws (1), adapter (4), and gasket (5) from thermostat housing (7). Discard
gasket (5)
7.
Remove two screws (6), thermostat housing (7), and gasket (8) from engine block (10). Discard
gasket (8).
Cover coolant passages. Dirt in cooling system will cause
overheating and engine failure.
8.
Remove two thermostats (9) from engine block (10).
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