ENGINE TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
TEST OR INSPECTION
ENGINE STALLS AT A LOW RPM.
Check the idle.
If the idle is not correct--adjust. Refer to paragraph 3-27.
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-
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.
NOT ENOUGH POWER.
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.
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.