3-40 ENGINE
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PISTON RING FREE END GAP AND 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) : 9.0 mm (0.35 in)
(2nd): 9.5 mm (0.37 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
PISTON PIN AND PIN BORE
Using a small bore gauge, measure the piston pin bore inside
diameter, and using a micrometer, measure the piston pin out-
side diameter. If the reading exceeds following limit, replace
both piston and piston pin.
% Piston pin bore I.D.
Service Limit: 23.030 mm (0.9067 in)
( 09900-20602: Dial gauge (1/1000 mm, 1 mm)
09900-22403: Small bore gauge (18 – 35 mm)
Using a micrometer, measure the piston pin outside diameter at
three positions.
% Piston pin O.D.
Service Limit: 22.980 mm (0.9047 in)
( 09900-20205: Micrometer (0 – 25 mm)
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