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 TM 5-1940-277-20
TM 1940-20/2
3-73. ENGINE THERMOSTAT REPLACEMENT INSTRUCTIONS (PORT OR STARBOARD)
TOOLS: Flat-Tip Screwdriver, 4 inch
7/16 inch Box Wrench
1/2 inch Socket
Ratchet Extension
PARTS/MATERIALS: Thermostat Element
Gasket
O-ring
Silicone Sealant
REMOVE:
NOTE
This procedure covers three different types of thermostats used
on different engines. Step one through step nine apply to the
MK1 and MK2 w/Sabre engine. Step ten through fifteen apply to
the MK2 w/Cummins engine.
1.
Open and secure engine hatches (refer to paragraph 3-154).
2.
Open and secure battery hatch cover (refer to paragraph 3-154).
MK2 W/SABRE
MK1
3.
Drain fresh cooling system on MK1 (refer to paragraph 3-68). Drain primary and secondary cooling
systems on MK2 (refer to paragraph 3-69).
4.
Using screwdriver loosen three hose clamps (1,2 and 3) on thermostat housing (4).
5.
On MK2, use socket to remove bolt (5) and washer (6) attaching thermostat mounting bracket (7) to
engine.
6.
Remove thermostat housing (4) from engine by separating from three hose connections at
clamps (1, 2 and 3).
3-158.2
Change 2
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