ENGINE 3-49
PISTON RING TO GROOVE CLEARANCE
Using a thickness gauge, measure the side clearances of the
1st and 2nd rings. If any of the clearances exceeds the limit,
replace both piston and piston rings.
& Piston ring to groove clearance
Service Limit (1st) : 0.18 mm (0.0071 in)
(2nd) : 0.15 mm (0.0059 in)
& Piston ring groove width
Standard (1st) : 0.93 – 0.95 mm (0.0366 – 0.0374 in)
1.55 – 1.57 mm (0.0610 – 0.0618 in)
(2nd) : 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(Oil) : 2.51 – 2.53 mm (0.0988 – 0.0996 in)
& Piston ring thickness
Standard (1st) : 0.86 – 0.91 mm (0.034 – 0.036 in)
1.38 – 1.40 mm (0.054 – 0.055 in)
(2nd) : 0.97 – 0.99 mm (0.038 – 0.039 in)
" 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
PISTON RING FREE END GAP AND PISTON RING END GAP
Before installing piston rings, measure the free end gap of each
ring using vernier calipers. Next, fit the ring in the cylinder, and
measure each ring end gap using a thickness gauge.
If any ring has an excess end gap, replace the ring.
& Piston ring free end gap
Service Limit (1st) : 7.0 mm (0.28 in)
(2nd) : 8.1 mm (0.32 in)
" 09900-20101: Vernier caliper
& Piston ring end gap
Service Limit (1st) : 0.5 mm (0.02 in)
(2nd) : 0.7 mm (0.03 in)
" 09900-20803: Thickness gauge
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