ENGINE 3-35
PISTON RING
PISTON RING FREE END GAP INSPECTION
Before installing piston rings, measure the free end gap of each
ring using vernier calipers. If the gap is less than the service
limit, replace the ring.
# Piston ring free end gap:
Standard:(1st) Approx. 4.3 mm
(2nd) Approx. 5.4 mm
Service Limit: (1st) 3.4 mm
(2nd) 4.3 mm
% 09900-20102: Vernier calipers
PISTON RING END GAP INSPECTION
Insert the piston ring squarely into the cylinder using the piston
head.
Measure the end gap with a thickness gauge.
If the gap exceeds the service limit, replace the piston ring.
# Piston ring end gap:
Standard:(1st) 0.10 – 0.25 mm
(2nd) 0.10 – 0.25 mm
Service Limit: (1st) 0.5 mm
(2nd) 0.5 mm
% 09900-20803: Thickness gauge
PISTON RING-TO-GROOVE CLEARANCE INSPECTION
Remove carbon deposit both from the piston ring and its groove.
Fit the piston ring into the groove. With the ring compressed and
lifted up, measure the clearance on the bottom side of the ring
using a thickness gauge.
# Piston ring-to-Groove clearance:
Limit: (1st) 0.18 mm
(2nd) 0.15 mm
# Piston ring groove width
Standard:(1st) 1.01 – 1.03 mm
(2nd) 1.01 – 1.03 mm
(Oil) 2.01 – 2.03 mm
# Piston ring thickness
Standard:(1st) 0.97 – 0.99 mm
(2nd) 0.97 – 0.99 mm
% 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
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