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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
17. ENGINE COOLANT TEMPERATURE ABOVE NORMAL.
Step 1.
Check for low coolant level in recovery bottle and expansion tank.
Add coolant to system (refer to paragraph 3-69).
Step 2.
Check for loose or missing drivebelt.
Replace missing drivebelt or replace belt tensioner (refer to paragraph 3-119.1).
Step 3.
Check for clogged or damaged keel cooler.
Remove clog from keel cooler or replace damaged keel cooler (refer to paragraph 3-77).
Step 4.
Check for malfunctioning thermostat.
Replace malfunctioning thermostat (refer to paragraph 3-154).
END OF TESTING
18.ENGINE HAS EXCESSIVE EXHAUST SMOKE UNDER LOAD.
Step 1.
Check if engine is operating at normal temperature.
Replace thermostat if stuck in open position (refer to paragraph 3-154).
Step 2.
Check for clogged air filter.
Clean or replace air filter.
Step 3.
Check for leak between turbocharger and intake manifold.
Repair leak if found.
Step 4.
Check for worn or damaged fuel injectors.
Locate and replace malfunctioning ruel injectors (refer to paragraph 3-127).
END OF TESTING
19. ENGINE WILL NOT REACH RPM WITH NO LOAD.
Step 1.
Check throttle linkage for incorrect adjustment.
Adjust throttle linkage to stop-to-stop position on control lever (refer to paragraph 3-37).
Step 2.
Check that stop control cable is fully pushed in and stop lever is fully forward.
Adjust stop control cable and lever (refer to paragraph 3-37).
Step 3.
Check that all fuel injectors are in good condition.
Replace fuel injectors if damaged or restricted (refer to paragraph 3-124).
Step 4.
Check for restricted fuel supply.
Clean or replace all fuel filters (refer to paragraph 3-62).
Step 5.
Check for worn or malfunctioning turbocharger.
Replace damaged turbocharger (refer to paragraph 3-123).
END OF TESTING
Change 2
2-29
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