Chevrolet Full Size Cars 1979-1989

Injection Pump Adapter, Adapter Seal, and New Adapter Timing Mark

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Marking the injection pump adapter



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Fig. Fig. 2 Installing the adapter seal



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Fig. Fig. 3 Injection pump adapter installation

Skip steps 4 and 9 if a new adapter is not being installed.

  1. Remove injection pump and lines. For details, refer to the procedure found earlier in this section.
  2.  
  3. Remove the injection pump adapter.
  4.  
  5. Remove the seal from the adapter.
  6.  

To install:

  1. If a new adapter is being installed, file the timing mark from the adapter. Do not file the mark off the pump.
  2.  
  3. Position the engine at TDC of No. 1 cylinder. Align the mark on the balancer with the zero mark on the indicator. The index is offset to the right when No. 1 is at TDC.
  4.  
  5. Apply a chassis lube to the seal areas. Install, but do not tighten the injection pump.
  6.  
  7. Install the new seal on the adapter using tool J-28425, or its equivalent.
  8.  
  9. Torque the adapter bolts to 25 ft. lbs. (34 Nm).
  10.  
  11. If a new adapter is being used, install timing tool J-26896, or equivalent, into the injection pump adapter. Torque the tool, toward No. 1 cylinder to 50 ft. lbs. (68 Nm). Mark the injection pump adapter, then remove the tool.
  12.  
  13. Install the injection pump and lines to the engine.
  14.  

 
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