TM 55-1930-209-14&P-21
(1)
Carbon on inside of spray tip may be loosened for easy removal by soaking about 15 minutes in
a suitable solution prior to external cleaning and buffing. (Methyel Etheyl Ketone solution TT-M-261 D is recommended.)
CAUTION
Care must be exercised when inserting reamer in spray tip to avoid contacting needle valve seat in
tip.
WARNING
Wear safety goggles when using compressed air.
(2)
Clean spray tip with a reamer. Turn reamer in a clockwise direction to remove carbon deposits.
Wash spray tip and dry with compressed air.
(3)
Clean spray tip orifices with a pin vise and proper size spray tip cleaning wire. Before using a
wire, hone the end of wire until it is smooth and free of burrs using a fine stone. Allow wire to extend 1/8 in from the tool.
(4)
Clean exterior surface of spray tip using a brass wire buffing wheel. Place tip over drill end of
spray tip cleaner tool and hold body of tip against buffing wheel. In this way, spray tip is rotating while being buffed.
(5)
When body of spray tip is clean, lightly buff tip end in a similar manner. This cleans spray tip
orifice area and will not plug orifice.
(6)
Wash spray tip in clean fuel oil, use safety goggles and dry with moisture free compressed air.
(7)
Clean and brush passages in injector body, using a fuel hole cleaning brush and rack hole
cleaning brush. Use safety goggles and blow out passages; dry them with compressed air.
(8)
Carefully insert reamer in injector body. Turn the reamer in a clockwise direction a few turns;
then remove reamer and check face of ring for reamer contact. If reamer does not make contact over entire face of ring,
repeat reaming procedure until reamer makes contact with entire face of ring. Clean opposite side of ring in a similar
manner.
(9)
Carefully insert reaming tool in injector nut. Turn reaming tool in a clockwise direction to remove
carbon deposits. Use care In reaming to prevent removal of metal or setting up burrs on spray tip seat.
(10)
Wash injector nut in clean fuel oil and dry with compressed air. Carbon deposits on spray tip
seating surfaces of injector nut will result in poor sealing and consequent fuel leakage around spray tip.
(11)
Carefully insert a . 375 in. diameter straight fluted reamer inside ring bore in injector body.
Turn reamer in a clockwise direction and remove any burrs inside ring bore. Then, wash injector body in clean fuel oil
and dry with compressed air.
(12)
When handling Injector plunger, do not touch finished plunger surfaces with your fingers. Wash
plunger and bushing with dean fuel oil and dry with compressed air. Be sure high pressure bleed hole inside of bushing
is not plugged. If this hole is plugged, fuel leakage will occur at upper end of bushing where it will drain out of injector
body vent and rack holes during engine operation, causing a serious oil dilution problem.
(13)
After washing, submerge parts in a clean receptacle containing clean fuel oil. Keep parts of
each injector assembly together.
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