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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 5.7L V8 - VIN [K] >> Overhaul >> Crankshaft & Main Bearings

Crankshaft & Main Bearings

  1. Remove oil pan. See OIL PAN REMOVAL & INSTALLATION article. Remove bearing cap. Use Plastigage method to check bearing clearance.
  2. Mark main bearing caps for identification so caps are replaced in same direction and location. Remove main bearings from cylinder block by inserting bearing Remover/Installer (J-8080) in crankshaft oil hole. Rotate crankshaft to "roll" bearing out. If remover/installer is unavailable, use a bent cotter pin.
  3. To install upper bearing half, lubricate journal and bearing. Insert plain end of bearing (the end without bearing tang) between crankshaft and notched side of block. With bearing remover/installer in crankshaft oil hole, rotate crankshaft to install bearing.
  4. Install lower bearing half into cap and lubricate with engine oil. Install and tighten main bearing cap with arrow pointing toward front of engine.
NOTE: Procedure describes main bearing removal and installation with engine in vehicle. Measure and change bearings one journal at a time.
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