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Crankshaft Main Bearing Journal Clearance

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NOTE: Refer to the appropriate article for the specification.
  1. NOTE: Crankshaft main bearing journals must be within specifications before checking journal clearance.

    Remove the crankshaft main bearing cap and crankshaft main bearing.

  2. Position a piece of Plastigage across the crankshaft main bearing surface.
    GFD264681Courtesy of FORD MOTOR COMPANY
  3. NOTE: Do not turn the crankshaft while carrying out this procedure.

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

  4. Measure the Plastigage to get the crankshaft main bearing clearance. The Plastigage should be smooth and flat. A changing width indicates a tapered or damaged crankshaft or crankshaft bearing.
GFD264682Courtesy of FORD MOTOR COMPANY