TM-9-2330-356-14

SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1

TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1990

TM-9-2330-356-14 - Page 315 of 528

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.

Step 2.

Suspect bad valves.

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.

Suspect loose bearings on connecting rods, or loose pistons. Notify general support

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