Piston Pin End

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Measuring Piston Pin Diameter

Courtesy of GENERAL MOTORS CORP.

NOTE: Measurements of all components should be taken with the components at normal room temperature.

Using an outside micrometer, take 2 measurements of the piston pin in the area of the connecting rod contact.

Fig 2: Checking Connecting Rod Piston Pin Bore Dimensions

Courtesy of GENERAL MOTORS CORP.

Using an inside micrometer, measure the connecting rod piston pin bore.
Subtract the piston pin diameter from the piston pin bore.
Compare the clearance measurements with the Engine Mechanical Specifications (LF1) or Engine Mechanical Specifications (LAU or LBW) .
If the clearance is excessive, replace the piston pin. If a new pin does not resolve the clearance problem, replace the connecting rod.