DETROIT DIESEL 53
2.1.1 Fuel Injector
Fig. 14 lnjector Needle Valve Test with Auxiliary Tester J 22640
CAUTION: To prevent damage to the pressure
VISUAL. INSPECTION OF PLUNGER
gage, do not exceed 100 psi during this test.
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
bottom helix and lower portion of the upper helix, if
chipped. that will not be indicated in any of the tests.
Remove the plunger from the injector as follows:
Fig. 16 Position of Fuel Flow Pipes in
Fig. 15 Checking Needle Valve Lift
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