Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



When installing an oil pump, fill it with clean oil.

Six Cylinder Engines
  1. Drain the oil and remove the oil pan.
  2.  
  3. Remove the 2 flange mounting bolts and remove the pickup pipe bolt.
  4.  
  5. Remove the pump and screen as an assembly.
  6.  
  7. To install, align the oil pump driveshaft with the distributor tang and install the oil pump. Position the flange over the distributor lower bushing, using no gasket. The oil pump should slide easily into place. If not, remove it and reposition the slot to align with the distributor tang.
  8.  
  9. Reinstall the oil pan and fill the engine with oil.
  10.  

V8 Gasoline Engines
  1. Drain the oil and remove the oil pan.
  2.  
  3. Remove the bolt holding the pump to the rear main bearing cap. Remove the pump and extension shaft.
  4.  

To install:

  1. Assemble the pump and extension shaft to the rear main bearing cap aligning the slot on the top of the extension shaft with the drive tang on the distributor driveshaft. The installed position of the oil pump screen is with the bottom edge parallel to the oil pan rails. Further installation is the reverse of removal.
  2.  

Diesel Engine
REMOVAL
  1. Remove oil pan.
  2.  
  3. Remove pump-to-rear main bearing cap bolt and remove pump and extension shaft.
  4.  

DISASSEMBLY
  1. Remove the pump cover attaching screws and the pump cover.
  2.  
  3. Mark the gear teeth so they may be reassembled with the same teeth indexing. Remove the idler gear and drive gear and shaft from the pump body.
  4.  
  5. Remove the pressure regulator valve retaining pin, the pressure regulator valve and all related parts.
  6.  

CLEANING AND INSPECTION
  1. Wash all parts in cleaning solvent and dry with compre