1.5L REVOTORQ ENGINE 67 K. PISTON AND PISTON RINGS 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. Check for piston pin dimensions. Details Specification (mm) Piston pin diameter 27 -0.005 Piston pin length 62 -0.3 Piston pin bore in piston 27.007-27.013 Height of piston 66.9 Piston to bore clearance 0.06 - 0.08 Maximum permissible difference in weights in each set for 4 pistons 5 gms 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 rebored. If piston ring is found to be defective as stated above, then complete ring set should be replaced. Piston and Piston Dia. (mm) Type Grade Piston Dia. (mm) Cyl. Bore Dia. (mm) Standard A 75.930 - 75.939 76.000 ~ 76.009 B 75.940 - 75.949 76.010 ~ 76.019 C 75.950 - 75.960 76.020 ~ 76.030 Piston Rings Type of ring Ring Thickness (mm) Axial Clearance in Piston Groove (mm) Butt Clearance in Cylinder Bore (mm) 1st Compression Ring 1.99 / 1.97 0.01-0.03 0.2 to 0.3 2nd Compression Ring 1.47 / 1.49 0.05 - 0.09 0.35 to 0.50 3rd Oil Control Ring 1.97 / 1.99 0.03 - 0.07 0.2 to 0.4
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