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Crankshaft & Main Bearings

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  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. Use Plastigage to 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 combination other than 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. Install all bearing caps except thrust bearing cap (No. 5 from front of engine). Tighten main bearing cap bolts to specification. See TORQUE SPECIFICATIONS . Install No. 5 bearing cap and tighten bolts finger tight. Pry crankshaft forward and pry No. 5 bearing cap to rear of engine to align thrust bearing. While retaining forward pressure on crankshaft, tighten main bearing cap bolts to specification. See TORQUE SPECIFICATIONS .
  5. Ensure crankshaft end play is within specification. Replace thrust bearing if end play is not within specification. See CRANKSHAFT MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS.
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