Piston - Pin to Bore Diameter

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

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.

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

Measure the piston pin bore diameter in two directions on each side. Verify the diameter is within specification.

If out of specification, install new components as necessary. Refer to ENGINE - 3.9L & 4.2L for the procedure .

Fig 1: Identifying Piston Pin Hole

Courtesy of FORD MOTOR CO.

Fig 2: Measuring Piston Pin Bore

Courtesy of FORD MOTOR CO.