3-36 ENGINE
PISTON RING TO GROOVE CLEARANCE
Measure the side clearances of the 1st and 2nd piston rings with
the thickness gauge. If any clearance reading exceeds the ser-
vice limit, replace both the 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) : 1.01 îš– 1 .03 mm (0.0398 îš– 0 .0406 in)
(2nd): 1.21 îš– 1.23 mm (0.0476 îš– 0.0 484 in)
(Oil) : 2.01 îš– 2 .03 mm (0.0791 îš– 0 .0799 in)
% Piston ring thickness
Standard (1st) : 0.97 îš– 0.99 mm
(0.038 îš– 0 .039 in)
(2nd): 1.17 îš– 1.19 mm
(0.046 îš– 0 .047 in)
& 09900-20803: Thickness gauge
09900-20205: Micrometer (0 îš– 2 5 mm)
PISTON RING FREE END GAP AND PISTON RING END GAP
At first measure the piston ring free end gap with the vernier cal-
ipers and then fit the piston ring squarely into the cylinder and
measure the piston ring end gap with the thickness gauge.
If any measurement exceeds the service limit, replace the piston
ring with a new one.
% Piston ring free end gap
Service Limit (1st) : 7.0 mm (0.28 in)
(2nd): 6.1 mm (0.24 in)
% Piston ring end gap
Service Limit (1st) : 0.50 mm (0.020 in)
(2nd): 0.50 mm (0.020 in)
& 09900-20101: Vernier calipers
09900-20803: Thickness gauge
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