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 TM 5-1940-277-20
TM 1940-20/2
Section IV. TROUBLESHOOTING (Continued)
MK1 and MK2 w/SABRE
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. ENGINE OVERHEATS (ENGINE AUDIBLE ALARM ACTIVATES) - Continued.
Step 3.
Check coolant level in header tank.
a.
Fill to 1" below neck.
Step 4.
Check for leaks in secondary cooling system.
a. Tighten hose clamps.
b. Replace defective hoses (refer to paragraph 3-67).
c. Replace header tank (refer to paragraph 3-72).
Step 5.
Inspect secondary water pump impeller, cam, and end plate (refer to paragraph 3-79).
a. Replace defective impeller (refer to paragraph 3-80).
b. Replace defective cam (refer to paragraph 3-80).
c. Replace end plate (refer to paragraph 3-80).
d. Replace secondary water pump (refer to paragraph 3-81).
Step 6.
Test water temperature sending unit (refer to paragraph 3-153).
a. Replace defective water temperature sending unit (refer to paragraph 3-101).
Step 7.
Check V-belt for looseness, breaks, or fraying.
a. Adjust to correct tension (refer to paragraph 3-119).
b. Replace V-belt (refer to paragraph 3-119).
Step 8.
Check primary cooling system for leaks.
a. Tighten hose clamps (refer to paragraph 3-67).
b. Replace defective hoses (refer to paragraph 3-67).
Step 9.
Check primary water pump for leaks.
a. Replace defective primary water pump (refer to paragraph 3-70).
CAUTION
Do not beach boat on rock shores. Damage to keel and
keel cooler may result.
b.
Replace thermostat (refer to paragraph 3-73).
Change 2
2-25
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