Chevrolet Nova/ChevyII 1962-1979

Rear Main Oil Seal

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Removing the upper half of the rear main bearing oil seal



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Fig. Fig. 2 Fabricate a special tool to install the rear main seal

The rear main bearing seal may be replaced without removing the crankshaft. Seals should only be replaced as a pair. Fabrication of a seal installation tool as shown in the figure will prevent damaging the bead on the cylinder block. The seal lips should face the front of the engine when properly installed.

  1. Remove the oil pan and the oil pump.
  2.  
  3. Remove the rear main bearing cap.
  4.  
  5. Pry the lower half of the old seal from the rear main bearing cap.
  6.  
  7. Position a brass punch at one end of the upper seal half. Using a small hammer, tap the punch until the other end of the seal protrudes far enough to be grasped with a pair of pliers. Pull out the old seal.
  8.  
  9. Clean all sealant and foreign matter from the engine block bearing cap and the crankshaft.
  10.  

To install:

  1. Coat the lips and bead of the new upper seal half with light engine oil, but do not oil the mating ends of the seal.
  2.  
  3. Insert the tip of the installation tool between the crankshaft and the seal seat of the cylinder block. Place the seal between the tip of the tool and the crankshaft, so that the bead contacts the tip of the tool. Be sure that the seal lip is facing the front of the engine, and work the seal around the crankshaft, using the installation tool to protect the seal from the corner of the cylinder block.
  4.  

Do not remove the tool until the opposite end of the seal is flush with the cylinder block surface.

  1. Remove the installation tool, being careful not to pull the seal out at the same time.
  2.  
  3. Using the same procedure, install the lower seal into the bearing cap. Using your finger and thumb to lever the seal into the cap.
  4.  
  5. Apply a suitable sealant to the mating faces of the engine block and the bearing cap. (See illustration.) Be careful to keep sealant off the seal split line. Fit the bearing cap to the engine block and torque the cap bolts to specifications.
  6.  
  7. Install the oil pump and the oil pan.
  8.  

 
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