2.1.1 Fuel Injector
DETROIT DIESEL 53
Fig. 14. - Injector Needle Valve Test with Auxiliary Tester J 22640
If all of the spray tip orifices are not open and injecting
CAUTION: To prevent damage to the
evenly, clean them during injector overhaul. Also refer
pressure gage, do not exceed 100 psi
to Trouble Shooting Chart 6 in Section 2.0.
during this test.
VISUAL INSPECTION OF PLUNGER
An injector which passes all of the previous tests should
have the plunger checked visually, under a magnifying
glass, for excessive wear or a possible chip on the
bottom helix. There is a small area on the
Fig. 15. - Checking Needle Valve Lift
Fig. 16. - Position of Fuel Flow Pipes In Comparator
1972 General Motors Corp.
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