Honda WB20XT2 Manual page 119

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CRANKCASE
PISTON PIN O.D.
Measure and record the piston pin O.D. at three points
(both ends and middle). Take the minimum reading to
determine piston pin O.D.
WB20XT2:
STANDARD:
SERVICE LIMIT: 12.954 mm (0.5100 in)
WB30XT2:
STANDARD:
SERVICE LIMIT: 17.954 mm (0.7068 in)
If the measurement is less than the service limit,
replace the piston pin (page 13-5).
Inspect the piston pin bore I.D. (page 13-7).
Inspect the connecting rod small end I. D. (page 13-10).
PISTON PIN-TO-PISTON PIN BORE
CLEARANCE
Subtract the piston pin O.D. from the piston pin bore
I.D. to obtain the piston pin-to-piston pin bore
clearance.
STANDARD: 0.002 – 0.014 mm (0.0001 – 0.0006 in)
SERVICE LIMIT: 0.08 mm (0.003 in)
If the calculated clearance is more than the service limit,
replace the piston pin (page 13-5) and recheck the
clearance.
If the clearance is still more than the service limit with
the new piston pin, replace the piston (page 13-5).
PISTON RING SIDE CLEARANCE
Measure the clearance between each piston ring and
ring groove of the piston using a feeler gauge.
WB20XT2:
STANDARD:
Top:
Second: 0.045 – 0.080 mm (0.0018 – 0.0032 in)
SERVICE LIMIT:
Top:
Second: 0.15 mm (0.006 in)
WB30XT2:
STANDARD:
Top:
Second: 0.045 – 0.080 mm (0.0018 – 0.0032 in)
SERVICE LIMIT:
Top:
Second: 0.15 mm (0.006 in)
If any of the measurements is more than the service
limit, inspect the piston ring width (page 13-9).
If the piston ring width is normal, replace the piston
(page 13-5) and reinspect the clearance.
If necessary, replace the piston rings (top, second, oil)
as a set and reinspect the clearance.
If any of the measurements is still more than the service
limit with the new piston rings, replace the piston (page
13-5).
13-8
12.994 – 13.000 mm
(0.5116 – 0.5118 in)
17.994 – 18.000 mm
(0.7084 – 0.7087 in)
0.035 – 0.070 mm (0.0014 – 0.0028 in)
0.15 mm (0.006 in)
0.060 – 0.095 mm (0.0024 – 0.0037 in)
0.15 mm (0.006 in)
WB20XT2•WB30XT2