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Home >> Subaru >> 2021 >> Outback Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical System (2.4L)) >> Cylinder Block >> Inspection >> Piston Pin And Connecting Rod Bushing

Piston Pin And Connecting Rod Bushing

WARNING: This page is about a different variant/trim than selected.
  1. Check that the connecting rod bushing is not damaged.
  2. Check the clearance between piston pin and connecting rod bushing. Check the clearance between piston pin and connecting rod bushing by measuring the outer diameter of piston pin and the inner diameter of connecting rod bushing respectively.
    1. Measure the outer diameter of piston pin with a micrometer.
      NOTE:
      • Measurement should be performed at a temperature of 20°C (68°F).
      • Measure the outer diameter of the piston pin at the two locations as shown in the figure, and read the value of most worn location.
      • Record the measured value.
      G13949155Courtesy of SUBARU OF AMERICA, INC.
    2. Using a caliper gauge, measure the inner diameter of connecting rod bushing.
      NOTE:
      • Measurement should be performed at a temperature of 20°C (68°F).
      • Measure the inner diameter of the connecting rod bushing at the two locations as shown in the figure, and read the value of most worn location.
      • Record the measured value.
      G13949156Courtesy of SUBARU OF AMERICA, INC.
    3. Calculate the clearance between piston pin and connecting rod bushing.

      Clearance between piston pin and connecting rod bushing: 

      Standard 

      0.004 - 0.026 mm (0.0002 - 0.0010 in)

  3. If the clearance between piston pin and connecting rod bushing is not within the standard, replace the connecting rod and piston pin as a set.
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