TM 9-2330-356-14
Table 5-4. Troubleshooting - Direct Support (Con`t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE (Con't)
12. BLACK SMOKEY EXHAUST AND EXCESSIVE FUEL CONSUMPTION.
Step 1.
Check for incorrect timing (para 7-87).
Retime engine.
Suspect bad valves.
Step 2.
Notify general support maintenance personnel.
13. TAPPING OR CLICKING SOUND FROM CYLINDER HEAD.
Step 1.
Check for too great a valve clearance (para 7-88).
Adjust rocker arm to valve clearance.
Step 2.
Check for broken valve spring (para 7-72).
Replace broken springs.
14. METALLIC KNOCKING, CLICKING, OR POUNDING FROM CRANKCASE OR CYLINDER BLOCK.
maintenance personnel.
15. LOW ENGINE COMPRESSION.
Step 1.
Check for loose cylinder head (para 7-72).
Properly tighten head.
Step 2.
Check for leaky head gasket (para 7-72).
Replace gasket.
Step 3.
Check for broken valve spring (para 7-72).
Replace broken springs.
Step 4.
Suspect bad valves, piston rings, or scored cylinder walls.
Notify general support maintenance personnel.
ALTERNATOR AND CHARGING CIRCUIT
16. UNDERCHARGED BATTERIES.
Step 1.
Check for moisture or dirt on top of batteries causing continuous battery discharge.
Clean the batteries (para 4-23).
5-7
