Crankshaft Inspection

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Measure the crankshaft runout.
- If the crankshaft runout exceeds the maximum runout, replace the crankshaft.
  Maximum Runout
  
  0.05 mm {0.0019 in}
  
  Fig 1: Measuring Crankshaft Runout
  Courtesy of MAZDA MOTORS CORP.
Measure the journal diameter in X and Y directions at the two points (A and B) as indicated in the figure.
- If not as specified, replace the crankshaft or grind the journal and install the undersize bearing.
  
  Fig 2: Measuring Crankshaft Journal Diameter
  Courtesy of MAZDA MOTORS CORP.

MAIN JOURNAL BEARING SPECIFICATIONS

Bearing Size (mm {in})	Standard Diameter (mm {in})
Standard	62,968-62.992 {2.4791-2.4799}
0.25{0.01} Undersize	62.718-62.742 {2.4693-2.4701}

CRANK PIN BEARING SPECIFICATIONS

Bearing Size (mm {in})	Standard Diameter (mm {in})
Standard	49.970-49.990 {1.9674-1.9681}
0.02 {0.0008} Undersize	49.950-49.970 {1.9666-1.9673}
0.05 {0.0020} Undersize	49.920-49.940 {1.9654-1.9661}
0.25 {0.01} Undersize	49.720-49.740 {1.9575-1.9582}