2.1.1
FUEL Injector
DETROIT DIESEL 53
CAUTION: To prevent damage to the pressure gage, do not exceed 100 psi 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 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. 14 Injector Needle Valve Test with Auxiliary Test J 22640
Fig. 15 Checking Needle Valve Lift
Fig. 16 Position of Fuel Flow Pipes in Comparator
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