TM 9-2320-387-24-2
Table 14-I.
Mechanical
lhubleshooting
(Cont’d).
MALFUNCTION
TEST OR INSPECTION
9.
ACCELERATOR
PEDAL STICKS OR FULL THROTM CANNOT BE OBTAINED
Disconnect accelerator cable from fuel injection pump. Move throttle lever on injection pump to
wide open throttle. If throttle lever does not move freely, replace injection pump (para. 16-6).
END OF TESTING!
10. LEAKING EXHAUST GASES OR EXHAUST NOISES
Check for leaking exhaust gases around exhaust manifolds. Replace any leaking exhaust manifold
gaskets or exhaust manifolds (para. 3-57).
END OF TESTING!
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. 15-4 or 15-51,
or water pump (para. 3-78).
step 2.
Check cylinder block for cracks. Replace engine (para. 15-26) 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. 3-78).
Step 2.
Remove surge tank cap (TM 9-2320-387-10). 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 (paras. 15-4 and 15-5) and check for
defective head gaskets, cracked cylinder heads, or cracked cylinder block. Replace
cylinder heads (paras. 15-4 and 15-5) if damaged. Replace engine (para. 15-26) if cylinder
block is cracked.
END OF TESTING!
13. ENGINE DOES NOT DEVELOP FULL POWER
step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Remove and test fuel injection nozzles. Replace worn fuel injection nozzles (para. 16-3).
Check for worn or damaged fuel injection pump. Replace worn or damaged fuel injection
pump (para. 16-6).
Perform step 3 of malfunction 2.
Check for damaged lifters. Replace damaged lifters (TM 9-2815-237-34).
Check for damaged camshaft. Replace damaged camshaft (TM 9-2815-237-34).
Check for burned valves. Replace burned valves (TM 9-2815-237-34).
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!
14-6
