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Home >> GMC >> 1981 >> Forward Control 7.4L Eng VIN W, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 7.4L V8 Engine >> Crankshaft & Rod Bearings >> Rear Main Bearing Oil Seal >> Installation

Rear Main Bearing Oil Seal: Installation

  1. Fabricate an 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.
    NOTE: Installation tool must remain in position until seal is positioned with both ends flush with block.
  2. Roll seal around crankshaft, using tool as a "shoehorn" to protect seal from sharp corner of seal seat surface. Make sure oil seal lip is positioned towards front of engine.
    Fig 1: Identifying Rear Main Oil Seal
    G09330526Courtesy of GENERAL MOTORS COMPANY
  3. Remove tool, taking care not to remove seal. Install lower half of seal in bearing cap, using tool as a "shoehorn" again, feed seal into cap using light pressure with thumb and finger.
  4. Install bearing cap with sealant applied to face, taking care to keep sealant off split line.
    Fig 2: Rear Main Oil Seal Installation Tool
    G09330527Courtesy of GENERAL MOTORS COMPANY
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