GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Oil Pump

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Fig. Fig. 1 Oil pump components

REMOVAL



  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Drain the engine oil.
  6.  
  7. Remove the front cover assembly.
  8.  
  9. Remove the oil filter adapter, pressure regulator valve and spring.
  10.  
  11. Remove the oil pump cover attaching screws and remove the cover.
  12.  
  13. Remove the oil pump gears.
  14.  

INSPECTION



  1. Inspect all components carefully for physical damage of any type and replace worn parts.
  2.  
  3. The inner tip clearance should be 0.006 inch.
  4.  
  5. The outer gear diameter clearance should be 0.008-0.015 inches.
  6.  
  7. The gear end clearance or the drop in the housing should be 0.001-0.0035 inches.
  8.  
  9. The pressure regulator valve-to-bore clearance should be 0.0015-0.003 inches.
  10.  
  11. Replace the oil pump assembly if any specification is out of range.
  12.  

ASSEMBLY AND INSTALLATION



  1. Lubricate the gears with petroleum jelly and install the gears into the housing.
  2.  
  3. Pack the gear cavity with petroleum jelly after the gears have been installed in the housing.
  4.  
  5. Install the oil pump cover and screws and tighten to 97 inch lbs.
  6.  
  7. Install the oil filter adapter with new gasket, pressure regulator valve and spring.
  8.  
  9. Install the front cover assembly.
  10.  
  11. Fill with clean engine oil. Start the engine, check the oil pressure and check for leaks. Do not run the engine without measurable oil pressure.
  12.  

 
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