TM 9-2320-289-20
Table 2-3. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
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 6.
Check fuel pump operation. Disconnect input fuel line at the fuel filter. Disconnect
pink lead from fuel injector pump. Use a quart capacity container and crank engine
for 15 seconds. Container should be at least ¼ full or contain ½ pt (0.23 1) of fuel,
Install low pressure gage in fuel line. Crank engine for 15 more seconds. Fuel
pressure should be 5.5-6.5 psi (38-45 kPa). Connect fuel inlet line to fuel filter and
connect pink lead to fuel injector pump.
If fuel flow is insufficient, replace fuel pump. (See paragraph 3-10)
21. STARTS, IDLES ROUGH WHEN HOT
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 1.
Check for leaking or restricted fuel lines.
Tighten fittings or replace leaking or restricted lines as required, (See
paragraph 3-13 or 3-14)
lf no leaks or crimps are obvious, bleed fuel filter. (See paragraph 3-17)
Step 2.
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.
22. KNOCKS AT IDLE WHEN HOT
Step 1.
Check oil level indicator for proper reading. (See TM 9-2320-289-10)
Step 2.
With engine cool, check level of coolant. (See TM 9-2320-289-10)
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Change 2
