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 TM 5-1940-277-20
TM 1940-20/2
Section IV. TROUBLESHOOTING (Continued)
MK2 w/CUMMINS
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. ENGINE CRANKS BUT WILL NOT START (Contd).
Step 5.
Check for contaminated fuel.
Drain supply tank and clean or replace all fuel filters and water traps.
Step 6.
Check for malfunctioning fuel pump or fuel injection pump.
Repair or replace fuel pump or fuel injection pump.
END OF TESTING
13. ENGINE STARTS BUT WILL NOT KEEP RUNNING.
Step 1.
Check for low fuel in supply tank.
Fill supply tank if empty
Step 2.
Check if engine stop cable and lever are in full forward position (refer to paragraph 3-41).
Move stop cable and lever to full forward position (refer to paragraph 3-41).
Step 3.
Check for plugged fuel lines or filter due to cool weather.
Drain fuel water traps and filters and warm up area if necessary.
Step 4.
Check for air leaks in fuel system.
Bleed fuel system and tighten all fittings and lines.
END OF TESTING
14. ENGINE WILL NOT SHUT OFF.
Step 1.
Check if engine stop control cable and lever go to full rearward position
(refer to paragraph 3-37).
Adjust fuel shutoff cable or lever (refer to paragraph 3-37).
Step 2.
Check for shorted diode on alternator flashing circuit.
Replace diode if defective.
END OF TESTING
15. ENGINE IDLES ROUGH WHEN WARM.
Step 1.
Check for high pressure fuel line leaks.
Tighten high pressure fuel lines (refer to 3-124).
Step 2.
Check for air in fuel system.
Bleed fuel system and tighten all lines (refer to paragraph 3-64).
Step 3.
Check if idle speed is set too low.
Adjust idle speed to 800 rpm.
Step 4.
Check for plugged fuel injector nozzles.
Remove, clean, or replace fuel injectors (refer to paragraph 3-127).
END OF TESTING
16. ENGINE OIL PRESSURE LOW.
Step 1.
Check oil level on crankcase dipstick.
Add oil to crankcase to reach correct operating level on dipstick refer to paragaph 3-134).
Step 2.
Check for malfunctioning oil pressure sender or gauge.
Replace oil pressure sender or gauge if malfunctioning (refer to paragraph 3-101).
Step 3.
Check for plugged oil filter.
Replace oil filter and change oil (refer to paragraph 3-76).
END OF TESTING
2-28
Change 2
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