TM 10-4320-310-14
5-7. REPLACE INJECTOR (Continued)
TESTING:
1
Visually inspect injector (1) for scoring or burning. Inspect to see if injector is bent, cracked, or damaged. If
injector is damaged, replace it.
NOTE
Loosen the pressure gauge connection, and crank the engine until trapped air
is removed from the system.
2
Connect testing device (3) to injector pump (4) and injector (1). Make sure side connection (5) is tightly locked.
Death or serious injury could occur if fuel is not handled carefully. Use in a
well-ventilated area away from open flame, arcing equipment, ignition
sources, heaters, or excessive heat. Engine must be turned off and cool
before refueling. Always store fuel in properly marked containers. DO NOT
SMOKE.
Serious injury could result from injector spray. Keep hands away from fuel
spray.
NOTE
Prior to testing injector, make sure throttle control hand lever is all the way to
the left past stop.
3
Crank engine by hand. As the engine is cranked, read fuel injection pressure on the gauge and check fuel spray
pattern from injector. Injection pressure should be 1958 to 2074 psi (135 to 143 bar). Fuel should spray out in an
even spray pattern. If spray pattern does not conform to above, replace injector. If injector nozzle drips fuel
before or after it has reached recommended injection pressure, replace injector.
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