Connecting Rod Measurement Procedure

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Piston Pin End

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 (LY7) or Engine Mechanical Specifications (LCS) .
If the clearance is excessive, replace the piston pin. If a new pin does not resolve the clearance problem, replace the connecting rod.

Connecting Rod Crankshaft Bearing End

Fig 3: Measuring Connecting Rod Crankshaft Bearing Bore

Courtesy of GENERAL MOTORS CORP.

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

Using an inside micrometer, measure the connecting rod crankshaft bearing bore.
Compare the bore measurements with the Engine Mechanical Specifications (LY7) or Engine Mechanical Specifications (LCS) .
Replace the connecting rod if the bore is out of specifications. DO NOT recondition the connecting rod.