TM 9-2320-280-34
Table 2-1. Mechanical Troubleshooting (Cont'd)
MALFUNCTION
TEST OR INSPECTION
11. LOSS OF COOLANT
Step 1.
Pressurize coolant system and check for leaks at water pump and around cylinder heads. If any leakage is
present, replace cylinder head gaskets, cylinder heads (para. 3-4 or 3-5) or water pump (para. 5-4).
Step 2.
Check cylinder block for cracks. Replace engine (para. 3-22 or 3-24) if cylinder block is cracked.
END OF TESTING!
12. ENGINE OVERHEATS
Step 1.
Check for leaking or defective water pump. Replace leaking or defective water pump (para. 5-4).
Step 2.
Remove surge tank cap (TM 9-2320-280-10). With engine running, check for excessive bubbles in surge tank
that may indicate leaking head gaskets or cracked cylinder heads. If bubbles are present, remove cylinder
heads (para. 3-4 and 3-5) and check for defective head gaskets, cracked cylinder heads, or cracked cylinder
block. Replace cylinder heads (para. 3-4 and 3-5) if damaged. Replace engine (para. 3-22 or 3-24) if cylinder
block is cracked.
END OF TESTING!
13. ENGINE DOES NOT DEVELOP FULL POWER
Step 1.
Remove and test fuel injection nozzles (para. 4-3). Replace defective fuel injection nozzles.
Step 2.
Check for defective fuel injection pump (TM 9-2815-237-34). Replace defective fuel injection pump (para. 4-6).
Step 3.
Perform step 3 of malfunction 2.
Step 4.
Check for damaged lifters. Replace damaged lifters (para. 3-9).
Step 5.
Check for damaged camshaft. Replace damaged camshaft (TM 9-2815-237-34).
Step 6.
Check for burned valves. Replace burned valves (TM 9-2815-237-34).
Step 7.
Check for worn or damaged pistons and piston rings. Replace worn or damaged pistons and piston rings
(TM 9-2815-237-34).
END OF TESTING!
14. LUBRICATING OIL DILUTED
Step 1.
Remove and test fuel injection nozzles (para. 4-3). Replace defective fuel injection nozzles.
Step 2.
Check for broken piston rings. Replace broken piston rings (TM 9-2815-237-34).
Step 3.
Check for defective fuel injection pump (TM 9-2815-237-34). Replace defective fuel injection pump (para. 4-6).
END OF TESTING!
15. ENGINE FAILS TO STOP WITH ROTARY SWITCH OFF
Check for defective fuel shutoff solenoid. Replace defective fuel shutoff solenoid (para. 4-8).
END OF TESTING!
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