1. Remove all combustion deposits by soaking the pistons in hot water with dishwashing liquid or a cleaner specifically designed to remove carbon and will not corrode aluminum. Follow the manufacturer’s instructions when using these cleaners.
Compressed air can pierce the skin and flying debris from compressed air could cause serious eye injury. Wear safety glasses when working with compressed air. Never use your hand to check for air leaks or to determine air flow rates. (00061a)
NOTE
Do not sand blast or glass bead blast pistons. Bead blasting rounds off ring lands. This will result in oil contamination leading to accelerated wear.
2. Thoroughly rinse the pistons. Dry parts with moisture free compressed air.
3. Clean the oil drain holes leading from the oil control ring groove to the underside of the piston crown. Run a small bristle brush through the passageways. Do not damage or enlarge the holes. Do not use a wire brush.
4. Verify that all other oil holes are clean and open.
NOTE
Avoid scratching the sides of the piston ring grooves.
5. Thoroughly clean the three piston ring grooves of all carbon deposits. A portion of a compression ring properly ground to a sharp chisel-like edge works well for this purpose.
6. Using dye penetrant, inspect the piston for surface cracks.
Particularly examine the area around the pin bores, ring lands and oil drain holes beneath the piston crown. If no cracks are found, thoroughly wash piston to remove traces of dye.
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