GM Firebird 1982-1992 Repair Guide

Rear Main Oil Seal

Imprimir

REMOVAL & INSTALLATION




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-Piece Neoprene Seal

See Figures 1, 2 and 3

The rear main seal is a one piece unit. It can be removed or installed without removing the oil pan or crankshaft.



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Fig. Fig. 1: The one-piece seal



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Fig. Fig. 2: One-piece seal removal



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Fig. Fig. 3: One-piece seal installation

  1. Jack up your vehicle and support it with jackstands.
  2.  
  3. Remove the transmission.
  4.  
  5. If equipped with a manual transmission, remove the clutch and pressure plate.
  6.  
  7. Remove the flywheel assembly.
  8.  
  9. Using a suitable tool, pry the old seal out.
  10.  
  11. Inspect the crankshaft for nicks or burrs, correct as required.
  12.  

To install:
  1. Clean the area and coat the seal with engine oil. Install the seal onto tool J-34686 or equivalent. Install the seal into the engine.
  2.  
  3. Install the flywheel and torque to specification.
  4.  
  5. Install the transmission. (If equipped with a manual transmission, install the clutch and pressure plate first.)
  6.  
  7. Check the fluid levels, start the engine and check for leaks.
  8.  

2-Piece Neoprene Seal

See Figures 4, 5, 6 and 7



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Fig. Fig. 4: Two-piece seal lower half removal



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Fig. Fig. 5: Two-piece seal upper half removal



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Fig. Fig. 6: Applying sealer to main bearing cap



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Fig. Fig. 7: Fabricated seal installation tool

Both halves of the rear main oil seal can be replaced without removing the crankshaft. Always replace the upper and lower seal together. The lip should face the front of the engine. Be very careful that you do not break the sealing bead in the channel on the outside portion of the seal while installing it. An installation tool can be fabricated to protect the seal bead.

  1. Remove the oil pan, oil pump and rear main bearing cap.
  2.  
  3. Remove the oil seal from the bearing cap by prying it out.
  4.  
  5. Remove the upper half of the seal with a small punch. Drive it around far enough to be gripped with pliers.
  6.  
  7. Clean the crankshaft and bearing cap.
  8.  
  9. Coat the lips and bead of the seal with light engine oil, keeping oil from the ends of the seal.
  10.  
  11. Position the fabricated tool between the crankshaft and seal seat.
  12.  
  13. Position the seal between the crankshaft and tip of the tool so that the seal bead contacts the tip of the tool. The oil seal lip should face the FRONT of the engine.
  14.  
  15. Roll the seal around the crankshaft using the tool to protect the seal bead from the sharp corners of the crankcase.
  16.  
  17. The installation tool should be left installed until the seal is properly positioned with both ends flush with the block.
  18.  
  19. Remove the tool.
  20.  
  21. Install the other half of the seal in the bearing cap using the tool in the same manner as before. Light thumb pressure should install the seal.
  22.  
  23. Install the bearing cap with sealant applied to the mating areas of the cap and block. Keep sealant from the ends of the seal.
  24.  
  25. Torque the rear main bearing cap to specifications.
  26.  
  27. Install the oil pump and oil pan.
  28.  
  29. Fill the engine with engine oil, start the engine and check for leaks.
  30.  

Rope Seal

See Figures 8, 9 and 10



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