3. Position the spindle, spring, upper spring disc, and spring adjusting nut on the nozzle holder. Turn the adjusting nut in until pressure can be felt on the spring. 4. Connect the injector to the injector test fixture. Turn the adjusting nut in or out as required to obtain a nozzle opening pressure of 2750 psi. 5. Position a new copper gasket over the spring adjusting nut and install the injector cap nut. Repeat the nozzle opening pressure test to make certain it has not changed.
6. Test the injector as previously outlined on page 115. If, after cleaning, the injector fails to pass these tests, the needle and nozzle should be replaced.
F. Installation 1. Drop a new injector seat washer into each in-
jector bore. Make certain that each washer lies flat in the bore. 2. Install each injector by positioning the nozzle end into its bore in the cylinder head and by
guiding the injector rubber seal into its slot in the cylinder head. 3. Work each assembly downward by hand as far as possible. NOTE: Do not use a hammer to seat the in-
jectors. 4. Align and install the mounting bolts. Torque each bolt to 15 ft. lbs. 5. Install the push rods by lifting the valve rocker arms with a 112" box wrench as previously out· lined for injector removaL 6. Adjust the valve lash 0.014" to 0.016" for both exhaust and intake valves. Connect the injector excess fuel return line to the injectors and at the "tee" connection in t he cylinder head.
7. Install the valve rocker cover and gasket, but do not connect the pressure lines to the injector inlets until after the injectors and lines have been flushed as outlined in Paragraph B, page 110. 8. After flushing and bleeding the injection system, reset the valve lash with the engine at normal operating temperature, 180".
FUEL INJECfION PUMP The fuel injection pump is mechanically driven by the engine camshaft and is self lubricated. Other than replacing the assembly as a complete unit, the only other servicing requirements are replacement of the pump drive shaft and seals, pump drive gear, pump to engine timing, and throttle speed adjustments.
A. Removal 1. Close the fuel tank shut-<>ff valve and clean all
2. 3.
4. 5.
dirt from the pump and injector line connections. Disconnect the four pressure lines from the injector inlet connections and from the pump. Disconnect the fuel line at the pump head and the excess fuel return line at the pump cover connection. Disconnect the throttle linkage at the pump. Remove the two nuts and washers from the pump mounting flange and remove the pump assembly and its drive shaft from the cylinder block as a unit. Use a drain pan to catch any fuel leakage. NOTE: 1/ the drive shaft does not remain in
the pump, fuel may leak into the engine crankcase during pump removal.
109
B.Pump Drive Shaft Inspection The injection pump drive shaft utilizes "U" cup seals, which may be replaced if defective. In addition, the shaft is serviced as an assembly for replacement purposes. 1. Carefully pull the shaft out of the pump housing with pliers and check the seals for cuts or tears. 2. Lubricate the new seals and "0" ring in diesel fuel to avoid damage and to facilitate ease of installation on the shaft. Carefully install the new seals onto the shaft with the sealing lips toward the ends of the shaft. Install the "0 " ring on the shaft. 3. Lubricate the complete shaft assembly with diesel fuel.
0/ the shaft must the pump a/tel' it is
NOTE: The stepped end
be at the lower end installed.
01
4. Slide the drive shaft into the shaft bore of the pump as far as th e seals. Carefully rotate the shaft and at the same time work the shaft into the pump. 5. Rotate the shaft so that the drive tang is fully seated in the distributor rotor. When the shaft is
