Piston Pin & Connecting Rod Bushing

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  .

   Courtesy 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  .

   Courtesy 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)