KRYOTEC ENGINE 40 I. PISTON AND PISTON RINGS Callout Description 1 Top Ring 2 Second Ring 3 Oil Ring 1. Remove carbon deposits, if any, from the piston. 2. Clean piston and piston rings using appropriate cleansing agent. NOTE The piston and piston rings can be reused if the bore taper and sphericity is within the specified limits. Carefully examine the piston rings for cracks, scoring, ring groove/ clip groove wear, piston pin bore wear. In case anyone piston is found to have any one of the above defects, replace the complete piston set. 3. Check for lateral clearance in piston ring groove. 4. Check for butt clearance in cylinder bore. 5. Verify that the internal diameter of the pistons pin bores are within specification. 6. Check that the thickness of the piston rings are within specification. 7. Check for piston pin dimensions. NOTE Butt clearance of piston ring is measured in unworn portion of the cylinder bore. Piston and piston rings of appropriate size should be used, if cylinder bores are re-bored. If piston ring is found to be defective as stated above, then complete ring set should be replaced. PISTON RINGS Measure Value Outside diameter pistons – Class A (mm) 82.930 - 82.940 Outside diameter pistons – Class B (mm) 82.940 - 82.950 Outside diameter pistons – Class C (mm) 82.950 - 82.960 Difference of weight allowed between pistons (g) +/- 5 Increase piston outer diameter (mm) 0.1 PINS Measure Value Diameter of seat pin (mm) 29.985 - 29.990 Pin outer diameter (mm) 29.975 - 29.980
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