GM Firebird 1982-1992 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



Except 3.8L Turbo

See Figure 1



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Fig. Fig. 1: Oil pump-V8

  1. Drain and remove the oil pan.
  2.  


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.

  1. Remove the oil pump-to-rear main bearing cap bolt. Remove the pump and the extension shaft.
  2.  
  3. Remove the cotter pin, spring and pressure regulator valve.
  4.  

Place your thumb over the pressure regulators bore before removing the cotter pin, as the spring is under pressure.

To install:
  1. Assemble pump and extension shaft to rear main bearing cap, aligning slot on top end of extension shaft with drive tang on lower end of distributor driveshaft.
  2.  

When assembling the driveshaft extension to the driveshaft, the end of the extension nearest the washers must be inserted into the driveshaft.

  1. Insert the driveshaft extension through the opening in the main bearing cap and block until the shaft mates into the distributor drive gear.
  2.  
  3. Install the pump onto the rear main bearing cap and install the attaching bolts. Torque the bolts to specifications:

    L4 engines: 22 ft lbs. (30 Nm)
     
    V6 engines: 25-35 ft lbs. (35-47 Nm)
     
    V8 engines: 65 ft lbs. (88 Nm)
     

  4.  
  5. Install the oil pan and fill the crankcase with engine oil.
  6.  

3.8L Turbo

  1. Disconnect the negative battery cable.
  2.  
  3. The oil pump is mounted externally on the timing chain cover.
  4.  
  5. Remove the oil filter.
  6.  
  7. Remove the pump cover-to-timing chain cover bolts.
  8.  
  9. Remove the pump cover, drive and driven gears.
  10.  
  11. Remove the oil pressure relief valve cap, spring and valve if necessary.
  12.  

To install:
  1. Lubricate the pressure relief valve with oil and install. Install the spring, gasket and valve cap.
  2.  

The next step is important because the pump may lose its prime when the engine is started after the oil pump has been disturbed.

  1. Pack the gear pockets with petroleum jelly, then install the drive, driven and pump cover.
  2.  
  3. Torque the cover bolts to 12 ft lbs. (16 Nm).
  4.  
  5. Install the oil filter full of engine oil.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Start the engine and check the oil pressure light or gauge. The oil pressure should be present in a few seconds. If not, stop the engine and restart the engine for a few seconds. The oil pressure should be present. If not, remove the oil pump and check for a potential problem.
  10.  

 
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