Visual Inspection And Cleaning Procedure

Connecting Rod

Fig 1: Connecting Rods
Courtesy of GENERAL MOTORS COMPANY
WARNING:

Refer to Safety Glasses Warning .

1. Clean the connecting rods (1) in solvent and dry with compressed air.
2. Inspect the connecting rod for the following:
   • Signs of being twisted, bent, nicked or cracked
   • Scratches or abrasion on the connecting rod bearing seating surfaces
3. 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.
4. If the beam of the rod is scratched or has other damage replace the connecting rod.

Piston

Fig 2: Identifying Piston Damage Inspection Areas
Courtesy of GENERAL MOTORS COMPANY
1. Clean the piston with a cleaning solvent. DO NOT wire brush any parts of the piston.
2. Clean the piston ring grooves.
3. Inspect the piston on the following:
   • Cracked ring lands, skirts or pin bosses
   • Ring grooves for nicks
   • Eroded areas on the top of the piston (1)
   • Scuffed or damaged skirts (2)
   • Worn piston pin bores (3)
4. If there is any excessive wear, replace the piston.
5. Measure the clearance between piston pin and piston bore. Use the following procedure: