Isuzu Cars and Trucks 1981-1991

Injection Timing

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adjustment
Diesel Engine
  1. Check to see if the notched line on the injection pump and mounting plate are aligned.
  2.  
  3. Bring the No. 1 piston to Top Dead Center (TDC) on the compression stroke by turning the crankshaft. The correct notch must be used for alignment as the damper pulley is provided with a total of seven notches.
  4.  
  5. Remove the front upper timing belt cover, check the timing belt for proper tension and alignment of the timing marks.
  6.  



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Fig. Diesel injection pump timing mark all diesel engines



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Fig. Diesel crankshaft timing indicator 4FB1 engine

  1. Remove the cam cover and rear plug, then check that the fixing plate fits smoothly into the slit at the rear end of the camshaft, then remove the fixing plate J-29761.
  2.  
  3. Disconnect the injection pip from the injection pump and remove the distributor head screw and gasket, then install a static timing gauge. Set the lift about 0.0040 in. (1mm) from the plunger.
  4.  
  5. Bring the piston in No. 1 cylinder to a point 45 and 1960and#x00B0; before TDC by turning the crankshaft, then calibrate the dial indicator to zero.
  6.  



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Fig. Timing marks 4FB1 engine



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Fig. Camshaft fixing plate 4FB1 engine

  1. The damper is provided with notched lines as illustrated. The four lines at one side are for static timing and should be used for service purposes. The three lines are for dynamic timing and used only at the factory.
  2.  



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Fig. Timing indicator C223 diesel engine

  1. Turn the crankshaft until the line 12and#x00B0; on the damper is brought into alignment with the pointer, then take a reading of the dial indicator. Standard reading is 0.020 in. (0.5mm).
  2.  
  3. If the reading on the dial indicator deviates from the specified range, hold the crankshaft to the "Injection Pump Setting" in the diesel engine tune-up specifications chart. Loosen the two nuts on the injection pump flange.
  4.  
  5. Move the pump to a point where the dial indicator gives a reading of 0.020 in. (0.5mm). Tighten the flange nuts.
  6.  



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Fig. Timing to specifications refer to specification chart, C223 engine



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Fig. Injection pump timing all diesel engines

 
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