GM Corvette 1984-1996 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



5.7L (VIN 8) Engine

See Figures 1 and 2

The 1984-85 vehicles are equipped with separate oil pan side gaskets and end seals which must be replaced every time the oil pan is removed. The 1986 and later vehicles have a one piece gasket/seal, that can be reused if it is not damaged during removal.

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle. Drain the engine oil into a suitable container.
  4.  
  5. On 1986-91 vehicles, perform the following:
    1. Disconnect the transmission oil cooler lines from the flywheel cover. Plug the lines to avoid contaminating the system.
    2.  
    3. Unfasten the catalytic converter AIR pipe clamps from the manifold and exhaust pipe.
    4.  

  6.  
  7. Disconnect the starter wiring and remove the starter brace nut.
  8.  
  9. Unfasten the starter mounting bolts, then remove the starter and position it aside.
  10.  
  11. On 1986-91 vehicles, remove the oil filter, then remove the oil cooler adapter from the block.
  12.  
  13. If not already done, remove the retainers, then remove the flywheel cover.
  14.  
  15. On 1986-91 vehicles, disconnect and plug the oil cooler line from the oil pan, and remove the ESC sensor shield, if equipped.
  16.  
  17. On 1986-91 vehicles, if necessary, remove the front crossmember braces.
  18.  
  19. Unfasten the oil pan bolts, noting their sizes and locations for installation, then carefully lower the oil pan and remove if from the vehicle.
  20.  
  21. Thoroughly clean the oil pan and block sealing surfaces.
  22.  

To install:


Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the oil pan, including the 4-piece gasket/end seal assemblies-1984-85 5.7L (VIN 8) engine



Click image to see an enlarged view

Fig. Fig. 2: On 1986-91 vehicles, the oil pan uses a 1-piece gasket which can be reused, if it is not damaged during oil pan removal

  1. On 1986-91 vehicles, apply a small amount of RTV sealant to the front and rear corners of the oil pan.
  2.  
  3. Install the oil pan, using new seals and gaskets on 1984-85 vehicles, or reusing the old gasket, if it is in good condition on 1986-91 vehicles.
  4.  
  5. Install the oil pan retainers, in their proper positions, and tighten them as follows:
    1. 1984-85 vehicles: 80 inch lbs. (9 Nm).
    2.  
    3. 1986 vehicles: tighten the oil pan-to-crankcase nuts to 14 ft. lbs. (19 Nm) and the oil pan studs to 80 inch lbs. (9 Nm).
    4.  
    5. 1987-88 vehicles: tighten the oil pan-to-crankcase nuts to 16 ft. lbs. (22 Nm), the corner oil pan-to-crankcase studs to 15 inch lbs. (2 Nm) and the oil pan-to-case studs to 8 ft. lbs. (11 Nm).
    6.  
    7. 1989-91 vehicles: 16 ft. lbs. (22 Nm).
    8.  

  6.  
  7. If removed, install the front crossmember braces and install the ESC sensor shield.
  8.  
  9. Install the flywheel cover/splash shield.
  10.  
  11. Install the starter and secure with the mounting bolts.
  12.  
  13. Attach the starter wiring and install the starter brace.
  14.  
  15. On 1986-91 vehicles, perform the following:
    1. Unplug and attach the oil cooler line to the oil pan. Attach the oil cooler adapter to the block, then install a new oil filter.
    2.  
    3. Attach the catalytic converter AIR pipe clamps to the manifold and exhaust pipe.
    4.  
    5. Unplug and connect the transmission oil cooler lines to the flywheel cover.
    6.  

  16.  
  17. If removed, unplug and connect the transmission oil cooler lines.
  18.  
  19. Carefully lower the vehicle.
  20.  
  21. Fill the engine crankcase with the proper type and amount of clean engine oil.
  22.  
  23. Connect the negative battery cable.
  24.  

5.7L (VIN J) Engine

See Figures 3 and 4

  1. Disconnect negative battery cable and remove the oil lever indicator from the guide tube.
  2.  
  3. Raise and support the vehicle safely, then drain the engine oil.
  4.  
  5. Remove the clutch housing cover attaching bolts, then remove the cover from the vehicle.
  6.  
  7. If equipped, remove the left and right wiring harness heat shields from the oil pan.
  8.  
  9. Disconnect the low oil sensor connection and remove the sensor from the pan.
  10.  
  11. Remove the bolts attaching the AIR pipe bracket to the oil pan, then remove the left and right converter heat shields.
  12.  
  13. Remove the nuts attaching the engine mounts at the front crossmember rear brace on the left and right sides. Remove the bolts attaching the front crossmember to the rear braces.
  14.  
  15. Remove the bolts attaching the left front crossmember rear brace to the left front side member, then remove the brace from the vehicle.
  16.  
  17. Remove the bolts attaching the right front crossmember rear brace to the right front side member, then remove the brace from the vehicle.
  18.  
  19. Remove the bolts attaching the oil pan and crankcase. Remove the oil pan and gasket from the vehicle.
  20.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the oil pan and related components-1990 5.7L (VIN J) engine shown



Click image to see an enlarged view

Fig. Fig. 4: Oil pan mounting and retainer tightening sequence-1995 5.7L (VIN J) engine shown

To install:
  1. Apply Loctite® 242 to the oil pan screw threads.
  2.  
  3. Install the oil pan and new gasket to the engine crankcase. Tighten the oil pan front screws to 106 inch lbs. (12 Nm). Tighten the oil pan bolts to 23 ft. lbs. (31 Nm).
  4.  
  5. Install the front crossmember rear braces and bolts retaining the braces to the front crossmember bolts. Finger-tighten the bolts.
  6.  
  7. Install the bolts retaining the left front crossmember rear brace to the left front side member, finger-tight.
  8.  
  9. Install the bolts retaining the right front crossmember rear brace to the left front side member, finger-tight.
  10.  
  11. Tighten the left and right front crossmember rear brace to front crossmember bolts to 59 ft. lbs. (80 Nm), then tighten the left and right front crossmember rear brace to front side member bolts to 46 ft. lbs. (62 Nm).
  12.  
  13. Install the nuts retaining the engine mounts to the front crossmember and tighten to 40 ft. lbs. (54 Nm).
  14.  
  15. Install the converter heat shields and screws.
  16.  
  17. Install the bolts retaining the AIR pipe bracket to the oil pan and tighten to 89 inch lbs. (10 Nm).
  18.  
  19. Install the oil level sensor in the pan and tighten to 18 ft. lbs. (25 Nm), then engage the wiring harness to the sensor.
  20.  
  21. Install the left and right wiring harness heat shields, if equipped, and tighten the bolts to 89 inch lbs. (10 Nm).
  22.  
  23. Install the clutch housing cover and tighten the bolts to 80 inch lbs. (9 Nm).
  24.  
  25. Lower the vehicle and insert the oil level indicator into the guide tube.
  26.  
  27. Properly fill the crankcase with clean engine oil.
  28.  
  29. Connect the negative battery cable.
  30.  
  31. If equipped, reset the CHANGE OIL indicator, as outlined in General Information & Maintenance of this repair guide..
  32.  

5.7L (VIN P and 5) Engines

See Figure 5

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle safely, then drain the engine oil.
  4.  
  5. Disengage the oil level sensor electrical connector and remove the sensor assembly from the side of the oil pan.
  6.  
  7. Remove the oil filter, then remove the oil filter adapter bolts and the adapter assembly.
  8.  
  9. Remove the starter motor assembly.
  10.  
  11. Remove the left catalytic converter.
  12.  
  13. Remove the flywheel cover.
  14.  
  15. Remove the knock sensor retaining nuts and shields.
  16.  
  17. Remove the oil pan bolts, nuts and studs. Be sure to note the location of stud bolts.
  18.  
  19. Remove the oil pan, reinforcements and gasket.
  20.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the oil pan and related components-5.7L (VIN P) engine shown, VIN 5 similar

To install:
  1. Thoroughly clean all gasket mating surfaces and apply a small amount of 1052914 or equivalent sealer, to the front cover and cylinder block junction and the rear seal retainer and cylinder block junction. Extend the bead of sealer approximately 1 inch (25mm) in either direction of these junctions.
  2.  
  3. Install the gasket onto the oil pan and reinforcements.
  4.  
  5. Install the gasket, pan and reinforcement assembly to the cylinder block with the bolts, studs and nuts.
  6.  
  7. Tighten the corner bolts or stud and nuts to 17 ft. lbs. (23 Nm) on 1992 vehicles or to 15 ft. lbs. (20 Nm) for 1993-96 vehicles. Tighten the remainder of the bolts and studs to 8 ft. lbs. (11 Nm).
  8.  
  9. Install the oil level sensor and tighten to 16 ft. lbs. (22 Nm).
  10.  
  11. Install the knock sensor shields and nuts. Tighten the nuts to 75 inch lbs. (8.5 Nm).
  12.  
  13. Install the flywheel cover.
  14.  
  15. Install the left catalytic converter.
  16.  
  17. Install the starter motor assembly.
  18.  
  19. Engage the wiring harness to the oil level sensor terminal.
  20.  
  21. Install the oil filter adapter and tighten the retainers to 17 ft. lbs. (23 Nm), then install the oil filter.
  22.  
  23. Lower the vehicle and properly fill the crankcase with clean engine oil.
  24.  
  25. Connect the negative battery cable.
  26.  
  27. If equipped, reset the CHANGE OIL indicator, as outlined in General Information & Maintenance of this repair guide.
  28.  

 
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