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Crankshaft & Main Bearings

  1. When checking main bearing clearance in vehicle, position a jack under adjoining bearing counterweight being checked. Remove only one main bearing cap at a time.
  2. Using Plastigage method, check main bearing clearance. If proper oil clearance cannot be obtained with standard bearings, try a combination of undersize bearings. DO NOT use any bearing combinations other than those listed. See UNDERSIZE MAIN & ROD BEARING COMBINATIONS  table.
  3. If use of bearing combinations does not bring clearance within specification, machine or replace crankshaft as necessary. Always replace bearings in pairs. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS.
  4. Tighten main bearing cap bolts finger tight. Pry crankshaft forward and tighten bearing caps to specification. See TORQUE SPECIFICATIONS  table.
  5. Check crankshaft end play. Replace thrust bearing if end play is not within specification. Thrust bearing is No. 3 (from front) main bearing in block. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS  table.
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