Table 2-2. Troubleshooting-CONT
TEST OR INSPECTION
20. Engine Will Not Shut Down.
Check if fuel pump manual override is open.
Make sure manual control knob is in the fully counterclockwise position.
Check if fuel pump shutoff valve is stuck.
Replace shutoff valve. Refer to para. 2-28.
Check if fuel tank vents are plugged.
Remove, clean, replace tank vents.
Check if engine is running on fumes drawn into air intake.
Close off air intake, locate and isolate the source of fumes.
21. Engine Will Not Reach Rated Speed Under Load.
Check for fuel suction line restriction.
Check for fuel inlet restriction. Replace fuel filter elements if necessary. Refer to PMCS Table 2-1,
Check if throttle linkage adjustment wrong.
Check for full throttle travel. Adjust linkage if necessary.
Check for fuel pump malfunctioning. Test by using substitute pump temporarily.
Replace fuel pump, if necessary. Refer to para. 2-29.
Check if tachometer has a malfunction.
Replace tachometer. Refer to para. 2-15.
Inspect for foreign object fouling propeller.
Check Propeller, remove foreign object (TM 55-1905-223-24-18).
22. White Smoke at Idle, Excessive.
Check for low coolant temperature.
Refer to "Coolant Temperature Below Normal," Malfunction 2.
Check for poor quality fuel. Take sample, if necessary.
Drain and clean fuel tank. Replenish fuel.
23. Exhaust Smoke (Black) Excessive Under Load.
Check for overloaded engine.
Check for proper operation of reduction gear (TM 55-1905-223-24-2).