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Crankshaft Main Bearings

  1. Use Plastigage method to measure main bearing clearances. Measure main bearing clearances 1 at a time. Wipe oil from surfaces to be checked. DO NOT allow crankshaft to turn once Plastigage is in place and bearing cap is tightened.
  2. Remove bearing cap. Measure flattened width of Plastigage with scale furnished to determine clearance.
  3. Standard crankshafts are marked with red or blue dots on side of counterweights. Factory ground crankshafts are identified by paint stripes marked on 1st counterweight. Bearings are also color coded.
  4. If red and blue bearing shells are used in combination, be sure to install shells of same color on same side of crankshaft.
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