TM 9-2320-289-20
Table 2-3. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
18. WILL NOT RETURN TO IDLE
Step 1.
Inspect accelerator cable for binding or damage,
Replace cable if damaged. (See paragraph 3-23)
Step 2.
Check for missing or damaged control spring on left side of fuel injector pump.
Install control spring if missing or replace if damaged. (See paragraph 3-23)
Step 3.
Check idle speed setting. (See paragraph 3-25)
19. IDLES ROUGH ON COLD-STARTS WITH BLACK SMOKE BUT CLEARS UP AFTER WARM-UP
Step 1.
Check for improper starting procedures. (See TM 9-2320-289-10)
Step 2.
Check for inoperative glow plugs and glow plug system. (See Electrical
Troubleshooting malfunction #19)
20. STARTS BUT WILL NOT CONTINUE TO RUN, HARD RESTARTING
Step 1.
Inspect air cleaner filter and polywrap,
Replace air cleaner filter if required.
Clean polywrap if required. (See
paragraph 3-9)
Step 2.
Check idle speed setting. (See paragraph 3-25)
WARNING
Diesel fuel is flammable. When disconnecting fuel lines to test fuel flow,
direct fuel spray away from source of ignition. A fire extinguisher must be
on hand in work area. Failure to follow this warning may result in serious
injury or death to personnel.
Step 3.
Check for leaking or restricted fuel lines.
Tighten fittings or replace leaking or restricted lines. (See paragraph 3-13 or
3-14)
If no leaks or crimps are obvious, bleed fuel filter. (See paragraph 3-17)
Step 4.
Check for contaminated fuel by draining fuel from fuel filter draincock into suitable
container. Check color of fuel to determine if the correct fuel is in fuel system.
Drain fuel and replace if contaminated or incorrect fuel is in fuel system.
Step 5.
Check seals on vent plug and draincock on fuel filter for damage. (See paragraph
3-17)
Replace damaged seals. (See paragraph 3-17)
Change 2
2-41
