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 TM 5-1940-277-20
TM 1940-20/2
RAIN:
NOTE
The boat must be out of water before draining cooling systems.
1.
Open and secure engine hatches (refer to paragraph 3-154).
NOTE
Have a container to catch coolant.
2.
Remove coolant filler cap (1) from header tank (2).
3.
Using a flat tip screwdriver loosen clamp (3), and disconnect coolant hose (4) from engine water
inlet (5).
4.
Collect and dispose of coolant as directed.
5.
Using 7/16 inch wrench open keel cooler drain plug (7) at both keel coolers (6).
6.
Collect and dispose of coolant as directed.
REFILL:
1.
Wrap threads of keel cooler drain plug (7) with Teflon tape and install keel cooler drain plugs (7) on
both keel coolers (6).
2.
Connect coolant hose (4) on engine water inlet (5).
3.
Using a flat tip screwdriver tighten clamp (3) on coolant hose (4) and engine water inlet (5).
4.
Refill cooling system with coolant allowing an air escape of approximately 1 inch at top of header
tank.
5.
Reinstall coolant filler cap (1) on header tank (2).
6.
Close engine hatches.
3-150.2
Change 2
D
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