14-4
Change 1
TM 9-2320-387-24-2
3.
ENGINE STOPS DURING NORMAL OPERATION
Step 1.
Perform step 1 of malfunction 1.
Step 2.
Perform steps 1 and 2 of malfunction 2.
END OF TESTING!
4.
ENGINE KNOCKS (MECHANICAL NOISE)
Step 1.
Remove converter housing cover (para. 5-11 or 5-12) and tighten torque converter capscrews to
32 lb-ft (43 N•m).
Step 2.
Remove and test fuel injection nozzles. Replace defective fuel injection nozzles (para. 16-3).
Step 2.1. Check for defective fuel injection pump. Replace defective fuel injection pump (para. 16-6).
Step 3.
Check for worn or damaged connecting rod bearings. Replace worn or damaged connecting rod
bearings (TM 9-2815-237-34).
Step 4.
Check for worn or damaged main bearings. Replace worn or damaged main bearings
(TM 9-2815-237-34).
Step 5.
Check for worn or damaged crankshaft. Replace worn or damaged crankshaft (TM 9-2815-237-34).
Step 6.
Check for worn or damaged pistons and connecting rods. Replace worn or damaged pistons and
connecting rods (TM 9-2815-237-34).
END OF TESTING!
5.
EXCESSIVE OIL LOSS OR CONSUMPTION
Step 1.
Check for oil leaks around oil pan, rocker arm covers, and timing gear cover oil seal. If any leakage is
found, repair as necessary (chapter 15).
Step 2.
Check for worn valve oil seals. Replace worn valve oil seals (TM 9-2815-237-34).
Step 3.
Check for worn valve guides. Replace worn valve guides (TM 9-2815-237-34).
Step 4.
Check for worn or damaged piston rings. Replace worn or damaged piston rings (TM 9-2815-237-34).
END OF TESTING!
5.1.
INJECTION PUMP LEAKS FUEL FROM THROTTLE SHAFT
Step 1.
Check for clogged/restricted fuel return lines (para. 16-4). Replace clogged/restricted fuel return lines.
Step 2.
Check for defective fuel line check valve. Replace defective fuel return line check valve with new
valve, or known good valve (TM 9-2815-237-34).
Step 3.
Check for defective fuel injection pump. Replace fuel injection pump (para. 16-6).
END OF TESTING!
6.
LOW OIL PRESSURE
Step 1. Check for worn oil pump. Replace worn oil pump (para. 15-15).
Step 2. Check for worn and damaged main bearings. Replace worn or damaged main bearings
(TM 9-2815-237-34).
Step 3. Check for worn or damaged rod bearings. Replace worn or damaged rod bearings (TM 9-2815-237-34).
Step 4. Check for worn or damaged crankshaft. Replace worn or damaged crankshaft (TM 9-2815-237-34).
Table 14-1. Mechanical Troubleshooting (Cont’d).
MALFUNCTION
TEST OR INSPECTION
