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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 what is 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. Refer to, in this article, CRANKSHAFT MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS.
    NOTE: Ensure main bearing oil holes are aligned with cylinder block oil holes.
  4. Install all bearing caps except thrust bearing cap (No. 3 from front of engine). Tighten main bearing cap bolts to specification. See TORQUE SPECIFICATIONS . Install No. 3 bearing cap and tighten bolts finger tight.
  5. Pry crankshaft forward and pry No. 3 bearing cap to rear of engine to align thrust bearing. While retaining forward pressure on crankshaft, tighten bearing cap to specification. See, in this article, TORQUE SPECIFICATIONS .
  6. Ensure crankshaft end play is within specification. Replace thrust bearing if end play is not within specification. See CRANKSHAFT MAIN & CONNECTING ROD BEARINGS  table.
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