Piston Pin to Bore Diameter

WARNING: Cover the end of the pin bore with a hand or shop rag when removing the retainer ring, since it has a tendency to spring out. Wear eye protection. Failure to follow instructions may result in personal injury.

Fig 1: Removing Piston Pin Retaining Ring

Courtesy of FORD MOTOR CO.

NOTE: Piston and piston pins are a matched set and should not be interchanged.

Measure the piston pin bore diameter in 2 directions on each side. Verify the diameter is within specification.
- If out of specification, install new components as necessary. Refer to the appropriate article in ENGINE for the procedure.
  
  Fig 2: Measuring Piston Pin Bore Diameter
  Courtesy of FORD MOTOR CO.