ENGINE 139 Piston and Piston Rings: 1. Remove piston rings from piston using ring expander. 2. Remove carbon deposits from piston. 3. Clean piston and piston rings thoroughly. 4. In case cylinder bore taper and ovality is within specified limit, then same piston and piston rings may be reused. 5. Examine pistons for cracks, scoring, other damages, like Ring groove wear, piston pin bore wear, spring clip groove wear/ damage etc. 6. In case any one of the piston has any defect, all the piston set should be replaced. 7. Examine piston rings for scoring, lateral clearance in piston ring groove and butt clearance in cylinder bore. 8. Butt clearances of piston ring should be measured in unworn portion of cylinder bore. 9. In case of any piston ring with any one of this defect, complete ring set should be replaced. 10. When cylinder bores are re-bored or honed, pistons and rings of appropriate size should be used. Piston size grade is stamped on piston crown. 11. Install piston rings in their respective position on piston using ring expander. 12. Stagger piston rings gaps such that they are 120°apart (with butt gap not in line with piston pin).
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