Carefully remove carbon deposits from the piston crown without damaging the crown surface. A small piston contact patch can be caused by improperly installed connecting rods.
Replace damaged pistons and pistons with burnt rings together with cylinder liners.
Checking the piston diameter
The nominal diameter of the piston is stamped on its bottom. The measurement is made with a micrometer at the bottom edge of the piston skirt, perpendicular to the axis of the piston pin.
The mounting clearance of the new piston is 0.04-0.06 mm, the wear limit is 0.2 mm.
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