ENGINE 3-15
PISTON PIN AND PIN BORE
Measure the piston pin bore inside diameter using the caliper
gauge and measure the piston pin outside diameter using the
micrometer. If either is out of specification or the different between
these two measurements is more than the limits, replace both
the piston and piston pin.
' 09900-20605: Dial calipers
09900-20205: Micrometer (0 – 25 mm)
% Piston pin bore
Service Limit: 12.030 mm (0.4736 in)
Piston pin O.D.
Service Limit: 11.980 mm (0.4717 in)
PISTON RINGS
Use vernier calipers to measure the piston ring free end gap.
Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap with a thickness gauge.
If any of the measurements exceed the service limit, replace the
piston ring with a new one.
' 09900-20101: Vernier calipers
09900-20803: Thickness gauge
% Piston ring free end gap
Service Limit:1st (R)............ 3.6 mm (0.14 in)
1st (T) ............ 3.6 mm (0.14 in)
2nd (R) .......... 3.3 mm (0.13 in)
2nd (T) ........... 4 mm (0.16 in)
% Piston ring end gap
Service Limit: 1st & 2nd .........0.80 mm (0.031 in)
Install the piston ring into the piston ring groove. Insert the thick-
ness gauge under the piston ring and measure the piston ring
side clearance.
If any of the measurements exceed the service limit, replace both
the piston and piston rings.
% Piston ring to groove clearance
STD (1st and 2nd): 0.02 – 0.06 mm
(0.0008 – 0.0024 in)
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