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Home >> GMC >> 1981 >> Forward Control 4.8L Eng VIN T, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.1 L & 4.8L 6-Cylinder Engines >> Crankshaft & Rod Bearings >> Rear Main Bearing Oil Seal >> Installation

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. Tool must remain in position until seal is positioned with both ends flush with block. Make sure seal lip is positioned toward front of engine and remove tool. See Fig 1.
  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
    G09330482Courtesy of GENERAL MOTORS COMPANY
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