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TM 5-4320-308-13
4-14. 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 gage connection, and crank the engine until trapped air is removed from
the system.
2
Connect testing device 604 628 00 (3) to injector pump (4) and injector (1). Make sure side connection (5) is tightly
locked.
WARNING
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. Always
store fuel in proper, marked containers. DO NOT SMOKE.
Serious injury could result from injector fuel spray. Keep hands away from fuel spray.
NOTE
Prior to testing injector, make sure throttle control hand lever is in the HIGH position.
3
Crank engine by hand. As the engine is cranked, read fuel injection pressure on the gage 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.
4-25
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