ARMY TM 9-2815-253-24
AIR FORCE TO 38G1-93-2
MARINE CORPS TM 2815-24/3
3-17. FUEL INJECTOR.
Fuel is flammable. Keep fuel away from heat and open flame. Failure to observe this warning
could result in severe personal injury or death.
Do not apply excessive force to injection fuel pipes. Failure to observe this caution could result in
damage to fuel pipes.
Catch fuel in suitable container.
Disconnect and remove fuel injector pipe (3 or 4, FIGURE 3-13). Refer to paragraph 3-18.1.
Disconnect fuel return hose (5) from injector (8).
Remove bolt (6) securing clamp (7); remove clamp.
Remove fuel injector (8) from cylinder head.
Remove injector copper sealing washer (9) from cylinder head taking care not to damage seating area.
Cover all openings.
Check nozzle body and nozzle needle for damage or deformation. If damaged or deformed, replace fuel injector
Inspect threaded components for thread damage and replace as necessary.
Attach fuel injector to a fuel injector tester. Point fuel injector into a clear container.
Keep body clear of test spray. Fluid can be injected into blood-stream causing blood poisoning and
Open valve on fuel injector tester and operate lever at one stroke per second.
Spray should start at 3480 psi (23,995 kPa) for used injector and 3552 to 3697 psi (24,491 to 25,491 kPa) for
new injector and a well atomized spray pattern should be visible.
Injector leakoff rate is 10 to 40 seconds between 2205 and 1470 psi (15,203 and 10,136 kPa).
Change 3 3-27