1.2L REVOTRON ENGINE 75 I. 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. 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 started above, then complete ring set should be replaced. Details Specification (mm) Piston pin diameter 19.997-20.000 Piston pin length 45.0 -0.3 Height of piston 51.89 Piston to bore clearance 0.055/0.075 Piston Pin Bore in Piston (mm) Grade Hole ø 1 20.005-20.008 2 20.008-20.011 3 20.011-20.014 Piston and Cylinder Bore Sizes (1.2L NG TC REVOTRON) Type Grade Cylinder Bore Dia. (mm) Piston Dia. (mm) Standard A 77.015/77.025 77.020 ±0.005mm B 77.025/77.035 77.030 ±0.005mm Piston Rings (1.2L NG TC REVOTRON) Type of ring Ring Thickness (mm) Axial Clearance in Piston Groove (mm) Butt Clearance in Cylinder Bore (mm) 1st Compression Ring 1.2 -0.010 / -0.030 mm 0.06/0.1 0.17/0.32 2nd Compression Ring 1.2 -0.005 / -0.030 mm 0.05/0.09 0.4/0.6 3rd Oil Control Ring 2.0 -0.030 / -0.130 mm 0.06/.014 0.2/0.7
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