ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ENGINE RUNS ERRATICALLY OR MISFIRES.
Step 1.
Step 2.
Step 3.
Step 4.
Dirty air cleaner.
Service air cleaner (para 4-51).
Obstruction in fuel supply line.
Clean or replace fuel supply line (para 4-33).
Valves out of adjustment.
Adjust valve tappet clearence (para 4-60).
Dirty nozzles.
Clean and replace defective nozzles.
6. ENGINE DOES NOT DEVELOP FULL POWER.
Step 1. One or more cylinders misfiring.
Refer to malfunction 5 of this table.
Step 2. Exhaust pipe or muffler restricted.
Clean or replace exhaust pipe or muffler (para 4-53).
7. ENGINE KNOCKS.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Engine overheated.
Refer to malfunction 11 of this table.
Low lube oil level.
Check oil level. Add oil if necessary (Lubrication order, para 4-4).
Valve tappet clearance too great.
Adjust valve tappet clearance (para 4-60).
Injector nozzle broken.
Replace injector nozzle (para 4-32).
improper grade of fuel or water in fuel.
Drain main fuel tank (para 3-45), fuel filters (para 3-22, 3-39) and day tank (para 3-21). Service
system with clean fuel (para 3-45).
4-11
