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Crankshaft Main Bearing Journal - Clearance

NOTE: Crankshaft main bearing journals must be within specifications before checking journal clearance.
  1. Remove the crankshaft main bearing caps and crankshaft main bearing.
  2. Lay a piece of Plastigage across the face of each crankshaft main bearing surface.
    Fig 1: Laying A Piece Of Plastigage Across Face Of Crankshaft Main Bearing Surface
    G01151269Courtesy of MAZDA MOTORS CORP.
    3. NOTE: Do not turn the crankshaft while carrying out this procedure.
    Fig 2: Measuring Plastigage (Main Bearing Journal Clearance)
    G01151270Courtesy of MAZDA MOTORS CORP.
  3. Install and remove the crankshaft main bearing cap.
  4. Verify the crankshaft journal clearance. Refer to SPECIFICATIONS .
    • If it is out of specification, install new components as necessary.
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