Connecting Rod Measurement

WARNING: This page is about a different variant/trim than selected.

Clean the connecting rods (1) in solvent and dry with compressed air.
WARNING: Wear safety glasses when using compressed air in order to prevent eye injury.

Fig 1: Connecting Rods
Courtesy of GENERAL MOTORS COMPANY
Inspect the connecting rods for the following:
- Signs of being twisted, bent, nicked or cracked.
- Scratches or abrasion on the rod bearing seating surface.
If the connecting rod bores (2) 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.
If the beam of the rod is scratched or has other damage replace the connecting rod.
Measure the piston pin to connecting rod bore using the following procedure:
1. Using an outside micrometer, take two measurements of the piston pin in the area of the connecting rod contact.
2. Using an inside micrometer, measure the connecting rod piston pin bore.
3. Subtract the piston pin diameter from the piston pin bore diameter.
4. The clearance should not be more than 0.039 mm (0.0015 in)
If there is excessive clearance, replace the piston pin.
If there is still excessive clearance, replace the connecting rod.