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Crankshaft Main Bearing Journal-to-Bearing Clearance

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NOTE: Crankshaft main bearing journals must be within specifications before checking the crankshaft mail bearing journal clearance.
  1. Remove the crankshaft main bearing cap and crankshaft main bearing.
  2. Position a piece of plastigage across the face of the crankshaft main bearing surface.
    Fig 1: Locating Crankshaft Main Bearing Surface
    G08593076Courtesy of FORD MOTOR CO.
  3. NOTE: Do not turn the crankshaft during this step.

    Install and tighten to specifications, then remove the crankshaft main bearing cap.

    • For additional information, refer to Engine .
  4. Measure the plastigage to get the crankshaft main bearing journal clearance. The plastigage should be smooth and flat. A changing width indicated a tapered or damaged crankshaft or crankshaft bearing.
    Fig 2: Measuring Crankshaft Main Bearing Journal Clearance Using Plastigage
    G08593077Courtesy of FORD MOTOR CO.
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