GM Cutlass RWD 1970-1987 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



See Figures 1 and 2

L-6 Engine
  1. Remove the oil pan.
  2.  
  3. Remove the two flange mounting bolts, the pick-up pipe bolt, then remove the pump and screen together.
  4.  

To install:
  1. Align the oil pump drive shafts to match with the distributor tang and position the flange over the distributor lower bushing. Install the pump mounting bolts.
  2.  
  3. Install the oil pan.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: A common oil pump location

Buick Built Engines

The oil pump is located in the timing chain cover and is connected by a drilled passage to the oil screen housing and pipe assembly in the oil pan. All oil is discharged from the pump to the oil pump cover assembly, on which the oil filter is mounted.



Click image to see an enlarged view

Fig. Fig. 2: Oil pump exploded view

  1. To remove the oil pump cover and gears, first remove the oil filter.
  2.  
  3. Remove the screws which attach the oil pump cover assembly to the timing chain cover.
  4.  
  5. Remove the cover assembly and slide out the oil pump gears. Clean the gears and inspect them for any obvious defects such as chipping or scoring.
  6.  
  7. Remove the oil pressure relief valve cap, spring and valve. Clean them and inspect them for wear or scoring. Check the relief valve spring to see that it is not worn on its side or collapsed. Replace the spring if it seems questionable.
  8.  
  9. Check the relief valve for a correct fit in its bore. It should be an easy slip fit and no more. If any perceptible shake can be felt, the valve and/or the cover should be replaced.
  10.  

To install:
  1. Lubricate the pressure relief valve and spring and place them in the cover. Install the cap and the gasket. Torque the cap to 35 ft. lbs. (47 Nm)
  2.  
  3. Pack the oil pump gear cavity full of petroleum jelly. Do not use gear lube. Reinstall the oil pump gears so that the petroleum jelly is forced into every cavity of the gear pocket, and between the gear teeth. There must be no air spaces. This step is very important. Unless the pump is packed, it may not begin to pump oil as soon as the engine is started.
  4.  
  5. Install the cover assembly using a new gasket and sealer. Tighten the screws to 10 ft. lbs. (13 Nm)
  6.  
  7. Install the oil filter.
  8.  

All V8 Engines
  1. Remove the oil pan.
  2.  
  3. Remove the attaching bolts, and then remove the pump and drive shaft extension.
  4.  

To install:
  1. Insert the drive shaft extension through the opening in the main bearing cap until the shaft mates with the distributor drive gear. You may have to turn the drive shaft extension one way or the other to get the two to mesh.
  2.  
  3. Position the pump on the cap and install the attaching bolts. Torque the bolts to 35 ft. lbs. (47 Nm)
  4.  
  5. Reinstall the oil pan.
  6.  

 
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