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    2000 Lexus Truck RX300 AWD 3.0L SFI DOHC 6cyl

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    Nissan Pick-ups and Pathfinder 1970-1988

    Injection Pump

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    REMOVAL & INSTALLATION



    See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10

    SD22 Engines
    1. Disconnect the battery cable(s). Remove the fan and radiator.
    2.  
    3. Remove the injection lines and cap all openings immediately.
    4.  
    5. Disconnect all lines and hoses attached to the pump or in the way of pump removal.
    6.  
    7. Remove the oil filter.
    8.  
    9. Remove the rear pump bracket.
    10.  
    11. Remove the timing gear cover.
    12.  
    13. Remove the timer round nut.
    14.  
    15. Remove the timer assembly using tool #ST1953000.
    16.  
    17. Unbolt and remove the pump.
    18.  

    To install:
    1. Align the crankshaft timing marks at TDC of the No. 1 piston's compression stroke.
    2.  
    3. Loosely install the injection pump. Mesh the idler gear and pump drive gear at the Y mark, then align the gear and keyway on the pump camshaft while turning the crankshaft pulley.
    4.  
    5. Install the timer round nut and washer. Tighten to 50 ft. lbs.
    6.  
    7. Align the timing mark on the front of the pump with the corresponding mark on the front cover. Tighten the pump mounting bolts to 18 ft. lbs.
    8.  
    9. Remove the cap from the priming pump.
    10.  
    11. Turn the priming pump counterclockwise.
    12.  
    13. Loosen the air vent screw.
    14.  
    15. Move the priming pump up and down until no further air comes from the vent screw.
    16.  
    17. Tighten the vent screw and push and turn the priming pump clockwise. Install the cap. Wipe off all spilled fuel.
    18.  



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    Fig. Fig. 1: Diesel injection line connection - SD22 engines



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    Fig. Fig. 2: Hose connection points - SD22 engines



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    Fig. Fig. 3: Injection pump rear bracket - SD22 engines



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    Fig. Fig. 4: Timing cover - SD22 engines



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    Fig. Fig. 5: Removing the timing round nut - SD22 engines



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    Fig. Fig. 6: Removing the timer - SD22 engines



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    Fig. Fig. 7: Aligning the crankshaft timing marks - SD22 engines



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    Fig. Fig. 8: Aligning the timer Y marks - SD22 engines



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    Fig. Fig. 9: Round nut installation - SD22 engines



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    Fig. Fig. 10: Injection pump timing mark alignment - SD22 engines

    SD25 Engines

    See Figures 11, 12, 13, 14, 15, 16, 17 and 18

    1. Disconnect the negative battery cable(s). Set the No. 1 piston at TDC of its compression stroke.
    2.  
    3. Disconnect the injection tubes. Plug the nozzle openings and be careful not to damage the spill tube.
    4.  
    5. Tag and disconnect the fuel cut solenoid harness.
    6.  
    7. Disconnect the accelerator wire, the overflow hose and the fuel inlet hose (plug this one). Additionally, disconnect the cold start device water line and the fuel return hose (plug this one).
    8.  
    9. Loosen the bolts and remove the injection pump drive gear cover..
    10.  
    11. Loosen the drive gear nut and then remove the gear with a two-armed puller.
    12.  
    13. Loosen the mounting bolts and nuts and remove the injection pump with the injection tubes still attached.
    14.  

    To install:
    1. Check the the No. 1 piston is still at TDC and then position the injection pump so that the pump flange aligns with the Y mark on the front cover. Install the drive gear and tighten the nut to 43-51 ft. lbs. (59-69 Nm).
    2.  

    Be careful not to allow the key to fall into the front cover and be absolutely certain that the Y marks are aligned.

    1. Install the drive gear cover with a new gasket and then adjust the plunger lift.
    2.  
    3. Tighten the injection pump mounting nut to 14-18 ft. lbs. (20-25 Nm) and the bolts to 12-16 ft. lbs. (16-22 Nm).
    4.  
    5. Install the injection tubes to the injectors. Bleed the system.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 11: Injection line connections - SD25 engines



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    Fig. Fig. 12: Remove the drive gear cover - SD25 engines



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    Fig. Fig. 13: Removing the drive gear nut - SD25 engines



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    Fig. Fig. 14: Align the crankshaft timing marks - SD25 engines



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    Fig. Fig. 15: Make sure that the Y marks on the gears are aligned - SD25 engines



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    Fig. Fig. 16: Install a dial gauge in the plug hole to check plunger lift - SD25 engines



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    Fig. Fig. 17: Fabricate a wooden block about 15mm thick - SD25 engines



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    Fig. Fig. 18: Injection tube routing - SD25 engines

    PLUNGER LIFT ADJUSTMENT



    SD25 Engines
    1. Remove the plug bolt from the distributor head and install a dial gauge.
    2.  
    3. Rotate the cold start device linkage clockwise and install a block of wood or paper (15mm) between the linkage and the device.
    4.  
    5. Set the No. 1 piston at TDC of the compression stroke and then rotate the crankshaft counterclockwise 20-25 degrees. Check the gauge in this position and then reset it to zero.
    6.  
    7. Rotate the crankshaft clockwise until the No. 1 piston is at TDC again and then read the gauge. Plunger lift should be 0.0374-0.0390 in. (0.95-0.99mm).
    8.  
    9. Adjust the plunger lift by rotating the injection pump until it is within range. Clockwise to decrease the measurement and counterclockwise to increase.
    10.  
    11. Tighten the injection pump mounting bolts. Disconnect the dial gauge and install the plug bolt with a new washer. Tighten it to 10-14 ft. lbs. (14-20 Nm).
    12.  

     
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