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128 ENGINE 273 MPFI Piston : When replacing the pistons or installing oversize pistons, be sure that the piston-to-cylinder clearance remains within specified range PISTON TOBORECLEARANCE 0.035 to 0.05 mm Piston-to-cylinder clearance is equal to the bore diameter minus the piston diameter, which is to be mean measured bymeasuring at the level of the piston in the direction transverse to piston pin axis, as shown. • Remove piston rings from piston using ring expander. • Remove the carbon deposits from the piston. • Clean the piston and piston rings thoroughly In case the cylinder bore taper and ovality is within specified limit, then same piston and piston rings may be reused. • Examine the pistons for cracks, scoring, other damages, ring groove wear, piston pin bore wear, spring clip groove wear/damage etc. • In case of any one piston with any one of this defect, complete piston set should be replaced. NOTE Max. permissible difference in weights of pistons with pin of an engine : 3 gms. Piston Pin Diameter in mm : 17 -0.005 Piston Pin Bore In Piston in mm : 17.002 to 17.007 PISTONDIAMETER STANDARDVALUE OVERSIZE (0.25) A 73.45 - 73.46 mm P1 73.70 - 73.71 mm B 73.46 - 73.47 mm Q2 73.71 - 73.72 mm