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Rear Main Bearing Oil Seal: Installation

  1. Fabricate installation tool as shown in illustration. Coat seal lips and seal bead of upper seal with motor oil. Keep ends of seal dry of oil and position tool between crankshaft and seal seat in cylinder block. Position seal between tip of tool and crankshaft.
  2. Roll seal around crankshaft, using tool as a "shoehorn" to protect seal from sharp corner of seal seat surface. Make sure that oil seal lip is positioned towards front of engine.
    NOTE: Installation tool must remain in position until seal is positioned with both ends flush with block.

    Remove tool taking care not to remove seal.

  3. Install lower half of seal in bearing cap, using tool as a "shoehorn". Feed seal into cap using light pressure with thumb and finger. Install bearing cap with sealant applied to face, taking care to keep sealant off of split line.
Fig 1: REAR MAIN OIL SEAL INSTALLATION TOOL
G09339585Courtesy of GENERAL MOTORS COMPANY