INJECTOR GP-FUEL 3921368 - Caterpillar

LOOSENING LOCKNUT
1. Locknut. 2. 8S2250 Nozzle Holding Tool.2. Loosen lift adjusting screw locknut (1). Loosen the lift adjusting screw two or three turns. Loosen pressure screw (3).3. Holding the nozzle in one hand, invert it and back out the pressure screw allowing the spring, spring seat and shims to fall into your hand. The valve may slide out, by its own weight, and should be handled carefully by its stem.
LOOSENING PRESSURE SCREW
3. Pressure screw.
PRESSURE SCREW ASSEMBLY REMOVED4. If the valve does not fall out, remove it with retractor (4). To prevent bending the valve, bottom it in the body with the retractor. Push down on the retractor body to mount the collet. Turn the knurled nut counterclockwise to secure the collet and withdraw the valve.
REMOVING VALVE
4. 5P958 Valve Retractor.5. Place the parts in solvent to loosen carbon and deposits of foreign material. Do not soak the body assembly in solvent for over 1 to 2 hours. The solvent can damage the epoxy bond used to secure the body assembly components together.Assemble Fuel Injection Nozzle (9L7883 Nozzles)
Before assembly, wash all parts thoroughly. Flush the body to remove any debris or lapping compound. Assemble while all parts are wet with clean fuel.1. Handle valve (1) by its shank and slide it partially into the body.
ASSEMBLING NOZZLE
1. Valve. 2. Spring seat. 3. Spring. 4. Shims. 5. Pressure screw. 6. Locknut. 7. Lift adjusting screw.2. Assemble lift adjusting screw (7) into pressure screw (5) two to three turns and install locknut (6), do not tighten the locknut. Put shims (4), spring (3), and spring seat (2) on the lift adjusting screw. Put the thickest shim (4) against the screw.3. Tilt the nozzle body and with spring seat (2) in contact with the top of valve (1), push the valve and spring components into the body and tighten the pressure screw hand tight.4. Put the nozzle in the 8S2250 Nozzle Holding Tool. Put the holding tool in a vise and tighten the pressure screw (5) to 75 to 80 lb.in. (86.5 to 92.2 cm.kg).
TIGHTENING PRESSURE SCREW To check or adjust the opening pressure and the valve lift see the TESTING AND ADJUSTING section of the Service Manual.5. To tighten the locknut, hold lift adjusting screw (7) with a screwdriver and tighten the locknut (6) just enough so lift adjusting screw (7) will not turn.
TIGHTENING LOCKNUT6. Use a torque wrench and tighten the locknut to 35 to 40 lb.in. (40.4 to 46.1 cm.kg).
TIGHTENING LOCKNUTService And Inspect Fuel Injection Nozzle (9L7883 Nozzles)
1. Use the brush (4) to clean the tip and body exterior.2. Secure the 8S2247 Cleaning Wire [.008 to .009 in. (0.20 to 0.23 mm) dia.] in pin vise (1) with 1/32 in. (0.79 mm) to 1/16 in. (1.59 mm) of wire protruding. A longer length of wire can bottom in the sac hole and break off in the orifice. Remove any burrs from the wire tip with the 8S2260 Stone. Stoning a flat surface on one side of the wire helps in reaming