Toyota Pick-ups/Land Cruiser/4Runner 1970-1988

Diesel Fuel System

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IDLE AND MAXIMUM SPEED ADJUSTMENTS



See Figures 1 and 2

The following adjustments are made with the transmission in neutral and the parking brake applied fully.

  1. Warm the engine to normal operating temperature and allow it to idle.
  2.  
  3. Turn the idle adjuster knob counterclockwise; the knob should return to its unlocked position.
  4.  
  5. Turn the engine off and remove the accelerator connection rod.
  6.  



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Fig. Fig. 1: Diesel idle speed adjustment with the accelerator rod disconnected at the pump lever



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Fig. Fig. 2: After making speed adjustments on the diesel, attach the accelerator cable and adjust it to remove all slack

  1. Connect a tachometer to the engine according the the tachometer manufacturer's instructions.
  2.  
  3. Start the engine and check the engine rpm at idle. The idle rpm should be 700 rpm.
  4.  
  5. If adjustment is necessary, turn the idle adjusting screw on the fuel injection pump as required to obtain the 700 rpm idle speed.
  6.  
  7. Fully depress the injection pump lever, note the maximum engine speed and release the accelerator pedal immediately. The maximum rpm should be 4900.
  8.  
  9. If adjustment is necessary:
    1. Remove the wire seal of the maximum speed adjusting screw, if so equipped.
    2.  
    3. Using Toyota special service tool #09275-54020 or its equivalent, loosen the locknut of the maximum speed adjusting screw.
    4.  
    5. Turn the maximum speed adjusting screw until the proper maximum rpm is obtained.
    6.  

  10.  
  11. Install the accelerator connecting rod and adjust its length so that there is no slack in the accelerator cable.
  12.  
  13. Check that the idle speed increases as the idle adjuster knob is pulled outward. Then turn the knob counterclockwise so that the rpm returns to the idle specifications.
  14.  
  15. Turn the engine off and disconnect the tachometer from the engine.
  16.  

 
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