TM 5-1940-322-24
0006 00
MECHANICAL SYSTEMS TROUBLESHOOTING (Contd)
Table 1. Engine Troubleshooting Procedures (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Check position of engine control stop
Push in engine control stop handle and
2. ENGINE CRANKS
ensure that cable is not broken and is
handle and cable.
BUT FAILS TO START
functioning properly at fuel injection
pump (WP 0032 00).
2. Check fuel level in supply tank.
1. Fill fuel supply tank if empty.
2. Bleed the fuel system after refueling
3. Check for fuel at engine (ensure fuel Bleed fuel system if air present
is at aft injector).
4. Check air cleaner for restrictions.
Remove restrictions and replace air
cleaner if needed (WP 0104 00).
5. Check fuel for contamination.
Drain supply tanks and clean or replace
all fuel filters (WP 0073 00) and fuel
water separators (WP 0076 00).
6. Check for continuity to fuel shut-off
1. Repair defective wires.
2. Replace injection pump
7. Check for malfunctioning fuel lift
Replace fuel lift pump (WP 0103 00)
pump or fuel injection pump.
and fuel injection pump (WP 0102 00).
1. Check fuel level in supply tank.
1. Fill fuel supply tank if empty.
3. ENGINE STARTS
BUT WILL NOT
2. Bleed fuel system after refueling
KEEP RUNNING
2. Check engine stop cable and lever
Move stop cable and lever to full
for full forward position.
forward position. Inspect stop cable
and lever for proper operation.
3. Check for plugged fuel lines or
Drain fuel water traps and filters
filter.
4. Check fuel system for air leaks.
Bleed fuel system (WP 0080 00) and
tighten all fittings and lines.
1. Check engine circuit switch for
Replace engine circuit switch if
4. ENGINE WILL NOT
damaged (WP 0041 00).
damage.
SHUT OFF
Adjust fuel shutoff cable and lever.
2. Check fuel shut-off cable and lever
for full rear position.
Replace blocking diode if defective
3. Check blocking diode for loose
connections.
1. Check high pressure fuel line for
Tighten high pressure fuel lines.
5. ENGINE IDLES
leaks.
ROUGH WHEN
WARM
2. Check for air in fuel lines.
Bleed fuel system (WP 0080 00) and
tighten all lines.
3. Check if idle speed is low.
Adjust idle speed to 650750 rpm.
4. Check for plugged fuel injector
Remove, clean or replace fuel injectors
nozzles.
