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 314 of 528

TM 9-2330-356-14

Table 5-4. Troubleshooting - Direct Support (Con‘t).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE (Con’t)

7.

ENGINE MISFIRES (Con’t).

Step 3.

Check for faulty injection pump or nozzles (para 7-87).

Repair, overhaul, rebuild, or replace pump and nozzles as necessary.

Step 4.

Check for broken valve spring (para 7-72).

Replace broken springs.

Step 5.

Check cylinder head assembly for build-up of carbon (para 4-73).

Clean carbon from cylinder head assembly.

8.

LOW ENGINE POWER.

Step 1.

Check for poor compression.

See Malfunction 15,

LOW ENGINE COMPRESSION.

Step 2.

Check for incorrect timing.

Retime engine (para 7-87).

9. LOW OIL PRESSURE.

Step 1.

Check to see if oil bypass valve is stuck open (para 7-74).

Clean or replace oil bypass valve and spring.

Step 2.

Check for worn oil pump (para 7-35).

Replace oil pump.

Step 3.

Suspect worn engine bearings (para 7-77).

Notify general support maintenance personnel.

10. HIGH OIL PRESSURE.

Step 1.

Check to see if oil bypass valve is stuck closed (para 7-74).

Clean or replace oil bypass valve and spring.

Step 2.

Check for clogged oil passages.

Clean all oil lines and passages.

11. EXCESSIVE OIL CONSUMPTION.

Suspect worn valve guides, bad seals in crankcase, sticking or worn piston rings. Notify

general support maintenance personnel.

5-6