Piston Pin Clearance Inspection

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Measure each piston pin bore diameter in X and Y directions at the four points (A, B, C and D) as indicated in the figure.
Standard Diameter

21.008-21.012 mm {0.82709-0.82724 in}

Fig 1: Measuring Piston Pin Bore Diameter
Courtesy of MAZDA MOTORS CORP.
Measure each connecting rod small end inner diameter in X and Y directions as indicated in the figure.
Standard Diameter

21.017-21.031 mm {0.82744-0.82799 in}

Fig 2: Measuring Connecting Rod Small End Inner Diameter
Courtesy of MAZDA MOTORS CORP.
Measure each piston pin diameter in X and Y directions at the four points (A, B, C and D) as indicated in the figure.
Standard Diameter

21.011-21.013 mm {0.82721-0.82728 in}
Calculate the piston pin-to-piston pin bore clearance.
- If not as specified, replace the piston and/or piston pin.
  Standard Clearance
  
  -0.005-0.001 mm {-0.00019-0.00003 in}
  
  Fig 3: Measuring Piston Pin
  Courtesy of MAZDA MOTORS CORP.
Calculate small end-to-piston pin clearance of the connecting rod.
- If small end-to-piston pin clearance of the connecting rod exceeds the maximum clearance, replace the connecting rod or piston pin.

Standard Clearance

0.004-0.020 mm {0.00016-0.00078 in}

Maximum Clearance

0.035 mm {0.0013 in}