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TM 5-4210-220-34
2-19.
ENGINE - Continued
2-19.5
Injectors - Continued
(32) Rotate the Injector one complete turn and note
the total runout on the dial.
(33) If total runout exceeds 0.008 in. (0.20 mm)
remove the injector from the gage. Loosen the
injector nut, recenter the spray tip by rotating.
Then retighten nut to 75 ft lb (115 Nm) and
repeat the concentricity test. If the spray tip
cannot be repositioned, rebuild the injector
with a new nut.
(34) Perform tests a, c, and d detailed in TEST
preceding. The injector must pass all tests
prior to service. If it fails, repeat all
disassembly,
inspection,
and
assembly
instructions.
d.
Fuel Injector Tube Repair
NOTE
Injector tube cannot be repaired. If the tube leaks it should be replaced. Cylinder head must be removed
to carry out this task.
(1)
Remove cylinder head as detailed In para. 2-19-8.
(2)
Place the injector tube installer J5286-4B in the injector tube. Insert the pilot J5286-5 through the small
opening of the injector tube. Thread the pilot onto the installer. Handtighten the pilot.
(3)
Tap on the end of the pilot to loosen the injector tube then lift tube, installer, and pilot out of the cylinder
head.
(4)
Discard the tube and seal.
(5)
Thoroughly clean the injector tube holes in the cylinder head to remove dirt, burrs, or foreign material.
(6)
Carefully remove burrs and foreign material. Do not not scratch or dent the sealing surfaces.
NOTE
Any cylinder head resurfacing must be done prior to injector tube installation.
(7)
Lubricate the new injector tube seal with engine oil (item 17, Appendix B). Place in top counterbore of
cylinder head.
2-190
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