TM 9-2350-256-34-1
Table 2-2. Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
15.
16.
17.
18.
19.
20.
21.
22.
AUXILIARY POWER UNIT-Continued
Step 6
Check engine compression (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Replace engine TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
ENGINE HARD TO START I?: COLD WEATHER
Step 1 Check for defective preheat components and/or associated wiring. Refer to Fault Isolation Diagram,
TM 9-2350-156-20. Medium Recovery Vehicle, M88A1.
Repair or replace defective preheat components and/or associated wiring (para. 2-17, 2-58. and 3-8 of TM
9-2815-221-34&P, Engine. Diesel. Industrial Type, Model DJBMA).
ENGINE STARTS BUT FAILS TO KEEP RUNNING
Step 1. Remove APU armor cover (TM 9-2350-256-20, Medium Recovery Vehicle. M88A1).
Step 2. Check fuel pump pressure (TM 9-2615-221-34&P, Engine, Diesel. Industrial Type. Model DJBMA).
Replace fuel pump (TM 9-2815-221-34&P Engine. Diesel. Industrial Type, Model DJBMA).
Step 3. Test fuel injector pump (TM 9-2815-221-34&P Engine, Diesel, Industrial Type, Model DJBMA).
Replace fuel injector pump (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Step 4. Test fuel injector nozzles (TM 9-2815- 221-34&P, Engine, Diesel. Industrial Type. Model DJBMA).
Replace fuel injector nozzles (TM 9-2815-221-34&P, Engine, Diesel. Industrial Type. Model DJBMA).
Step 5. Check valve clearance (TM 9-2815-221-34&P, Engine. Diesel, Industrial Type. Model (DJBMA).
Adjust valves (TM 9-2815-221-34&P, Engine. Diesel. Industrial Type. Model DJBMA).
ENGINE OVERHEATS
Step 1
Remove APU from vehicle (para 2-15A)
Remove and clean oil cooler (TM 9-2815-221-34&P Engine. Diesel, Industrial Type. Model DJBMA).
ENGINE MISFIRES, LACKS POWER OR EMITS BLACK SMOKE
Step 1. Check engine for proper rpm setting (TM 9-2815-221-34&P Engine, Diesel, Industrial Type, Model DJBMA).
Adjust rpm setting if required (TM 9-2815-221-346-P Engine, Diesel, Industrial Type, Model DJBMA).
Step 2
Remove XPU armor cover and side panel (TM 9-2350-256-20, Medium Recovery Vehicle, M88A1).
Step 3. Check glow plugs and lead wires using Fault Isolation Diagram, TM 9-2350-256-20. Medium Recovery Vehicle,
M88A1.
Repair or replace defective parts (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Mode1 DJBMA).
Step 4. Test fuel injector pump (TM 9-2815- 221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Replace fuel injector pump if defective (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Step 5. Test fuel injector nozzles if defective (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Replace fuel injector nozzles if defective (TM 9-2315-221-34&P, Engine. Diesel. Industrial Type. Model DJBMA).
Step 6. Check engine timing (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Retimeengine if required (TM 9-2815-221-34&P. Engine, Diesel, Industrial Type. Model DJBMA).
Step 7. Check valve clearance (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Adjust valve clearance (TM 9-2815-221-34&P, Engine. Diesel, Industrial Type. Model DJBMA).
Step 8. Check engine compression (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
Replace engine (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
ENGINE KNOCKS
Step 1. Remove APU armor cover (TM 9-2350-256-20, Medium Recovery Vehicle, M88A1).
Step 2. Check engine timing (TM 9-2815-221-34&P, Engine, Diesel. Industrial Type. Model DJBMA).
Retime engine (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA).
Step 3. Check valve clearance (TM 9-2815-221-34&P Engine, Diesel, Industrial Type. Model DJBMA).
Adjust valve clearance (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
Step 4. Test fuel injector pump (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
Replace fuel injector pump if defective (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
Step 5. Test fuel injector nozzles (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
Replace fuel injector nozzles (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA).
Step 6. If cause of engine knocks cannot be corrected by above steps, replace engine (para 4-2b).
ENGINE USES EXCESSIVE OIL AND EMITS LIGHT BLUE SMOKEY EXHAUST
Step 1. Check air intake system for restrictions.
Remove all restrictions.
Step 2. Operate APU with hydraulic system selector control lever in AUX position for fifteen minutes.
If light blue smokey exhaust continues, replace engine (para 4-2b).
HIGH AIR TEMPERATURE LIGHT ON APU CONTROL BOX FAILS TO OPERATE PROPERLY
Check for defects in electrical circuit. Refer to Fault Isolation Diagram, TM 9-2350-256-20, Medium Recovery Vehicle.
M88A1.
Repair or replace defective components.
LOW OIL PRESSURE LIGHT IN APU CONTROL BOX FAILS TO OPERATE PROPERLY
Check for defects in electrical circuit. Refer to Fault Isolation Diagram, TM 9-2350-756-20. Medium Recovery Vehicle,
M88A1.
Repair or replace defective components.
Change 8
2-9
