GM Corvette 1984-1996 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



5.7L (VIN 8) Engine

See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle, then drain the engine oil into a suitable container.
  4.  
  5. Remove the oil pan, as outlined earlier in this section.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Once the oil pan is removed, the oil pump can be accessed

  1. Remove the pump-to-rear main bearing cap bolt, then remove the pump and extension shaft.
  2.  



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Fig. Fig. 2: Exploded view of the oil pump assembly-5.7L (VIN 8) engine

To install:
  1. Assemble the pump and extension shaft to the rear main bearing cap, aligning the slot on the top end of the extension shaft with the drive tang on the lower end of the distributor driveshaft.
  2.  
  3. Install the pump-to-rear bearing cap bolt and tighten to 80 ft. lbs. (108 Nm).
    1. Install the oil pan, as outlined earlier in this section.
    2.  

  4.  

5.7L (VIN J) Engine

See Figures 3, 4 and 5

  1. Disconnect battery negative cable.
  2.  
  3. Remove the primary timing chain and crankshaft sprocket.
  4.  
  5. Remove bolts attaching the oil pump to the cylinder case, then remove the oil pump from the vehicle.
  6.  
  7. Remove O-rings from crankshaft and, if applicable, the oil pump.
  8.  
  9. For 1993-95 vehicles, remove the oil pickup seal.
  10.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the oil pick-up and crankcase baffle-5.7L (VIN J) engine



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Fig. Fig. 4: View of the oil pick-up assembly-5.7L (VIN J) engine



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Fig. Fig. 5: On 1993-95 vehicles, remove the oil pickup seal-5.7L (VIN J) engine

To install:
  1. Install new O-rings onto the crankshaft and oil pump, as applicable.
  2.  
  3. If applicable, install the oil pickup assembly seal.
  4.  
  5. Apply Loctite® 262 to the oil pump bolts and install them along with the oil pump, finger-tight.
  6.  

Make sure the 2 flats of the pump drive gear are aligned with the 2 flats on the crankshaft. Do not force pump onto crankshaft.

  1. Using oil pump aligning tool J-38135 or equivalent pump aligner/seal installer, align oil pump on the crankshaft. Tighten the oil pump bolts to 19 ft. lbs. (26 Nm).
  2.  
  3. Install a new oil pump shaft seal using tools J-38135 and J-38463 or equivalent aligner and seal installer.
  4.  

Install a new oil pump shaft seal whenever the pump is removed from the vehicle.

  1. Install the primary timing chain and crankshaft sprocket.
  2.  
  3. Connect the negative battery cable.
  4.  

5.7L (VIN P and 5) Engines

See Figure 6

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle safely.
  4.  
  5. Drain the engine oil and remove the oil pan.
  6.  
  7. Remove the oil pan baffle nuts.
  8.  
  9. Support the oil pump by hand and remove the bolt attaching the oil pump to the main bearing cap.
  10.  
  11. Carefully remove the baffle, the oil pump assembly, driveshaft and retainer.
  12.  



Click image to see an enlarged view

Fig. Fig. 6: Exploded view of the oil pump and related components-5.7L (VIN P and 5) engines

To install:

The oil pump pickup should be submerged in oil and the pump primed prior to installation. Failure to prime the pump may result in oil pump failure or internal engine damage. Also, if the pickup screen and pipe assembly was removed from the pump, they must be replaced to assure a proper interference fit.

  1. Install the oil pump assembly, shaft and retainer, aligning the slot on the top of the pump driveshaft with the drive tang on the lower end of the distributor driveshaft.
  2.  
  3. Install the oil pan baffle, then install the bolt to the main bearing cap, followed by the baffle nuts. Tighten the retaining bolt to 65 ft. lbs. (88 Nm) and the baffle nuts to 25 ft. lbs. (34 Nm).
  4.  
  5. Install the oil pan and lower the vehicle.
  6.  
  7. Properly fill the engine crankcase with clean engine oil.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. If equipped, reset the CHANGE OIL indicator, as outlined in General Information & Maintenance of this repair guide..
  12.  

 
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