k. Thoroughly rinse the valve (4) in clean dieselfuel before installing it in the valve body (3).l. Examine the flat sealing surface of the valvebody (surface which contacts lower end of the holderbody) and make certain surface is clean and free ofscratches. This surface may be lapped, if necess-ary, using lapping compound, castor oil, and alapping block.After lapping, remove all traces oflapping compound with clean diesel fuel.m. Make certain that the bottom flat seating sur-face of the nozzle holder body (15) is clean and ingood condition. Rinse the valve (4) and valve body(3) in clean diesel fuel, then insert valve (4) intoposition in the valve body (3). Place the valve body(3) and valve (4) in position on the end of the nozzleholder body and center the valve body with the holderbody (15). Install and tighten the nut (5) to a torqueof 40 to 60 inch-pounds.NOTEIt is important that the valve body becentered in the nozzle retaining nut.Use care while tightening the nozzleretaining nut so that the valve bodyremains centered in the nut.n. If malfunctioning of the nozzle holder assemblywas not corrected by removal and cleaning of thenozzle valve body and valve, disassemble and cleanthe nozzle holder as follows:(1) Clamp nozzle holder (15) assembly in aholding fixture and remove the cap nut (10) and gas-ket (11 ) from upper end of nozzle holder. Loosenand remove the pressure adjusting screw locknut (8).(2) Remove pressure adjusting screw (9),spindle spring (12), and spindle (13).(3) Remove nozzle retaining nut (5), and dis-assemble the nozzle assembly.(4) Place all parts in clean diesel fuel. Usingfiltered compressed air, blow out the fuel passagesin the holder body.(5) Visually inspect the parts for damage orwear; replace necessary parts. Examine the flatsealing surface of holder body (15) (surface which con-tacts upper end of valve body) and make certain thesurface is clean and free from scratches. This sur-face should be lapped if necessary, using lapping com-pound, castor oil, and a lapping block. When lapping,use care to keep the nozzle holder body square withthe lapping block to assure contact with the entirearea being resurfaced.After lapping, remove alltraces of the lapping compound with clean diesel fueland dry with filtered compressed air.(6) Examine the spindle spring (12). If thespring is scratched or pitted, it must be replaced.Also, the spring must be replaced if the ends haveworn. Always replace springs when rebuildinginjector.(7) Rinse spindle (13) in clean fuel and insertit into holder body (15). Place the spindle spring (12)in position on spindle (13). Install pressure adjustingscrew (9), pressure adjusting screw locknut (8), capnut (1 O) and gasket (11); do not tighten at this time.(8) Install nozzle valve (4), valve body (3), andnozzle retaining nut (5). Tighten nut to a torque of40 to 60 foot-pounds.O. When rebuilding an injector assembly, thenozzle assembly, spindle (13), spring (12), adjust-ing screw (9), and all gaskets (2, 14, 11) must bereplaced.14-40. Test and Adjustment.WARNINGKeep hands away from nozzle tip whenpopping a nozzle.The finely atomizedfuel is ejected with sufficient force topenetrate the skin and cause bloodpoisoning.a. Use diesel injector test set tool (table 2-1)and lest and adjust each nozzle as follows(1) Bolt or clamp base of nozzle tester to awork bench.(2) Turn nozzle tester valve handle to the openposition. Loosen filler cap to prevent air lock in thetester. Operate handle until fuel flows from end oftester fuel line, then close valve.(3) Install nozzle in tester and connect line.Place spray collector under valve end of nozzle.(4) Open nozzle tester valve. Operate handlea few quick strokes and observe popping pressureindicated on pressure gauge. Popping pressure forthe injectors is 2900 ± 75 psi.NOT ENew nozzles and rebuilt nozzles withnew springs are set at 3100 to 3150psi to compensate for initial set ofnew spindle springs.b. Adjust nozzle to obtain popping pressure asfollows(1) Remove cap nut (12) from upper end ofnozzle and loosen adjusting screw locknut (9).(2) While operating handle, turn pressure ad-justing screw (8) into increase or out to decrease pop-ping pressure. When pressure is obtained, hold ad-justing screw and tighten locknut to 60 to 75 foot-pounds torque.c. Dry the nozzle tip. Operate handle slowly un-til pressure is approximately 200 psi below poppingChange 1 14-29
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