47 486 PL ENGINE P PISTON AND PISTON RINGS : Clean piston and piston rings thoroughly. Note : If cylinder bore is taper and ovality is within specified limits, then same piston and piston rings may be re-used. Inspect Piston for cracks, scoring, other damages, ring groove wear, piston pin bore wear, spring dip groove wear/damage etc. In case of any one piston is with any one of the above defects, Complete piston set is to be replaced Inspect piston rings for, scoring, lateral clearance in piston ring grooves and butt clearance in cylinder bore. Fig. 106 & 107 NOTE : The above measurement of piston ring should be done in unworn portion of the cylinder bore. If any piston ring have any of the above defect. Complete ring set should be replaced. In case cylinder bore is rebored or honed, piston and rings of appropriate size should be used. NOTE : Piston size is stamped on piston crown arrow indicates the front of the engine. Install piston rings in their respective position on the piston using ring expander. Fig. 108 Ensure the top & bottom face of the I & II ring. (Top is marked on the rings) Stagger piston ring gaps such that they are 120 degree apart. Fig. 108 Fig. 107 Fig. 106
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