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 TM 55-1905-217-34
Figure 3-7. Fuel injector high pressure test.
(d) Use the adjusting screw in the injector tester handle and depress the injector plunger just far
enough to close both ports in the injector bushing. The point at which both ports are closed easily
noticed because the injector spray will decrease appreciably and the pressure will rise.
(e) If there is excessive clearance between the plunger and the bushing, the operator will be
unable to pump up pressure beyond normal valve opening (pop) pressure. Replacement of the plunger
and bushing is then necessary.
(f) Pump the test fixture and maintain a pressure of 1600 to 2000 pounds per square inch and
inspect for leaks at the injector filter cap gaskets, body plugs, injector nut seal ring area, and injector rack
hole.
CAUTION
Do not permit the pressure in the test fixture to equal or exceed the capacity of the
pressure gauge.
(5) Spray pattern test.
3-9
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