POWERHEAD
90-855347R1 JANUARY 1999 Page 4A-29
CLEANING PISTON RING GROOVES
Keystone (tapered) ring grooves
CAUTION
Care must be taken not to scratch the side surfaces of the ring groove. Scratching
the side surface of the ring groove will damage the ring groove.
1. Use a bristle brush and carbon remover solution to remove carbon from side surfaces.
2. A tool can be made for cleaning the inner diameter of the tapered ring grooves. The
tool can be made from a broken tapered piston ring with the side taper removed to
enable the inside edge of the ring to reach the inner diameter of the groove. Carefully
scrape carbon from inner diameter of ring grooves. Care must be taken not to damage
the grooves by scratching the side surfaces of the grooves.
Piston with two half keystone (half tapered) rings (135/150 Models)
Enlarged View of
Piston Ring Grooves
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