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INSPECTION - TM-5-4210-220-34_178
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR - TM-5-4210-220-34_180
TM 5-4210-220-34 2-19. ENGINE - Continued The  fuel  spray  from  an  injector  can  penetrate  the  skin.    Fuel  which  enters  the  blood  stream  can  cause  a serious infection.  Follow instructions carefully and use proper equipment to test an Injector.  All tests must be performed using injector test oil J26400.  To fully test an injector,  all the following tests should be carried out. a. Injector Control Rack And Plunger Test (1) Place Injector in holding fixture J22396 as shown. (2) Place handle on top of injector follower.        Adjust    contact    screw    in handle so it rests at center of follower, when the follower spring is compressed. (3) Push up control rack on the injector to the    no-fuel    position.        Push    handle down to depress follower fully. (4) Release   pressure   on   handle   slowly, while    moving    control    rack    up    and down.      The   control   rack   should   fall each time under gravity. (5) If the control rack is stiff, loosen the injector nut, turn the tip and retighten.  Repeat until rack is free.  If the rack isn’t free change the Injector nut as detailed in REPAIR following. b. Visual Inspection Of Plunger NOTE This test need not be carried out if a reassembled injector is being tested. (1) Support the injector, follower end up, in holding fixture J22396. (2) Compress the follower spring by hand.  Raise spring above the stop pin with a screwdriver and withdraw the pin.  Allow the spring to rise gradually. (3) Remove injector from holding fixture.  Turn upside down and catch the spring, follower and plunger as they drop out. (4) Inspect the plunger.  If the plunger is chipped, worn, or scratched especially in the helix area, replace the plunger and bushing. (5) Reinstall the plunger, follower, and spring. c. Injector Operation Tests (1) Install  injector  in  tester  J23010  or  similar  model.    Ensure  correct  clamping  head  is  used.    Follow  tool instructions with extreme care to ensure mounting is correct. 2-183

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