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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 400/M40 >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 6.2L V8 Diesel - VINS [C,J] >> Overhaul >> Rear Main Bearing Oil Seal >> Removal & Installation

Removal & Installation

  1. With oil pan removed, remove rear main bearing cap. Loosen all main cap bolts slightly. Thread the screw threads of removal tool into upper half of rear main seal. Withdraw upper half of seal from block.
  2. Feed the steel mesh cable through upper rear main seal groove until it comes out on the opposite side of crankshaft. Install a guide funnel over cable end. Lubricate new upper rear main seal and insert it in the gripping end of mesh cable.
  3. Pull on opposite end of mesh cable and guide new seal into groove. Remove tool from end of seal. Apply sealer (Loctite 496 ) to rear main cap seal groove and install seal. Seat seal in groove and trim end of seal flush with bearing cap.
  4. Place a piece of Plastigage on rear main journal. Install rear main cap and tighten all main bearing caps to specifications. Remove rear main cap and check Plastigage for bearing clearance.
  5. If out of specification, check ends of seal for frayed ends or excess material that may be preventing main cap from seating properly. Clean Plastigage from journal and bearing.
  6. Apply a thin film of anaerobic sealant to surface of cap that mates with block. Keep sealant off bearing and seal. Apply a light coat of engine oil to surface of crankshaft that rides on seal. Install rear main bearing cap and tighten to specifications.
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