Connecting Rod Inspection and Measurement. Cadillac Concours 1997

For 1990-2009 cars

1. Clean the connecting rods in solvent and dry with compressed air.
2. Inspect the connecting rods for the following:

• | Signs of being twisted, bent, nicked, or cracked

• | Scratches or abrasion on the rod bearing seating surface

3. If the connecting rod bores contain minor scratches or abrasions, clean the bores in a circular direction with a light emery paper. DO NOT scrape the rod or rod cap.
4. Measure the piston pin to connecting rod bore using the following procedure:

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

4.2. | Using an inside micrometer, measure the connecting rod piston pin bore.

4.3. | Subtract the piston pin diameter from the piston pin bore.

4.4. | The clearance should not exceed 0.016 mm (0.0006 in).

5. If the clearance is excessive, replace the piston pin.