TM 5-3805-261-34
ENGINE TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
c.
ENGINE STALLS AT A LOW RPM.
Step 1.
Check the idle.
If the idle is not correct--adjust. Refer to paragraph 3-27.
Step 2.
Check the fuel injection valves and pumps. Run the engine at an RPM that causes rough running.
Loosen a fuel line nut on the injection valve of each cylinder.
If the loosening of a fuel line nut does not make a difference--replace injection valve. Refer to paragraph 3-
25.
d.
SUDDEN CHANGES IN ENGINE SPEED.
Check the governor and fuel injection pump.
If the springs, linkage or other parts are damaged or defective--replace. Refer to paragraph 3-25.
e.
NOT ENOUGH POWER.
Step 1.
Check the fuel pressure at the fuel injection pump housing. Fuel pressure at high idle should be 15 psi.
If the fuel pressure is below 15 psi--replace fuel filter element.
If the fuel pressure is still low--proceed to Step 2.
Step 2.
Check the fuel bypass and check valves in the fuel transfer pump.
If the bypass or check valves are damaged or defective--replace. Refer to paragraph 3-29.
3-5
