GM Bonneville/Eighty Eight/LeSabre 1986-1999

Oil Pump

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CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

REMOVAL



See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the front cover from the engine.
  4.  
  5. Remove the oil filter adapter, pressure regulator valve and spring.
  6.  
  7. Remove the oil pump cover-to-front cover screws and the cover. Remove the inner and outer pump gears.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: The oil pump assembly is located at the front of the crankshaft

INSPECTION



See Figures 2, 3 and 4

  1. Remove the front cover from the engine.
  2.  
  3. Remove the oil filter adapter, pressure regulator valve and spring.
  4.  
  5. Remove the oil pump cover-to-front cover screws and the cover. Remove the inner and outer pump gears.
  6.  
  7. Clean all parts in a suitable solvent. Remove all varnish, dirt and sludge. Thoroughly clean the gasket mating surfaces.
  8.  
  9. Inspect the pump cover and front cover for cracks, scoring, porous or damaged casting, damaged threads, or excessive wear. Inspect the pressure regulator for scoring, sticking in bore or burrs.
  10.  
  11. Check the oil pump gears for:
    1. Inner gear tip clearance - 0.006 inch (0.152mm)

      Click image to see an enlarged view

      Fig. Fig. 2: Use feeler gauges to measure the gear tip clearance

    2.  
    3. Outer gear diameter clearance - 0.008-0.015 inch (0.203-0.381mm)

      Click image to see an enlarged view

      Fig. Fig. 3: Measure the outer gear diameter clearance and compare with specifications

    4.  
    5. Gear end clearance (gear drop in housing) - 0.001-0.0035 inch (0.025-0.089mm)

      Click image to see an enlarged view

      Fig. Fig. 4: Measure the gear end clearance (gear drop-in housing)

    6.  
    7. Pressure regulator valve-to-bore clearance - 0.0015-0.003 inch (0.0015-0.003mm)
    8.  

  12.  

INSTALLATION



  1. Using petroleum jelly, pack the pump and assemble the gears in the housing.
  2.  
  3. Tighten the oil pump cover-to-front cover screws to 97 inch lbs. (11 Nm).
  4.  
  5. Install the pressure regulator spring and valve. Install the oil filter adapter.
  6.  
  7. Install the front cover to the engine.
  8.  
  9. Connect the negative battery cable.
  10.  

 
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