Honda GX270H, Manual

Page: 158 / 182

14-15
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CRANKCASE
PISTON SKIRT O.D.
Measure and record the piston skirt O.D. at a point 10
mm (0.4 in) from the bottom of the skirt and 90 degrees
to the piston pin bore.
GX270H:
GX390H1:
If the measurement is less than the service limit,
replace the piston (page 14-13).
Inspect the cylinder sleeve I.D. with this inspection
(page 14-14).
PISTON-TO-CYLINDER CLEARANCE
Subtract the piston skirt O.D. from the cylinder sleeve
I.D. to obtain the piston-to-cylinder clearance.
If the calculated clearance is more than the service
limit, replace the piston (page 14-13) and recheck the
clearance.
If the clearance is still more than the service limit with
the new piston, replace the cylinder barrel (page 14-6).
PISTON PIN BORE I.D.
Measure and record the piston pin bore I.D. of the
piston.
GX270H:
GX390H1:
If the measurement is less than the service limit,
replace the piston (page 14-13).
Inspect the piston pin O.D. with this inspection (page
14-16).
STANDARD: 76.975 – 76.985 mm
(3.0305 – 3.0309 in)
SERVICE LIMIT: 76.85 mm (3.026 in)
STANDARD: 87.975 – 87.985 mm
(3.4636 – 3.4640 in)
SERVICE LIMIT: 87.85 mm (3.459 in)
90°
10 mm
(0.4 in)
STANDARD: 0.015 – 0.042 mm
(0.0006 – 0.0017 in)
SERVICE LIMIT: 0.12 mm (0.005 in)
STANDARD: 18.002 – 18.008 mm
(0.7087 – 0.7090 in)
SERVICE LIMIT: 18.042 mm (0.7103 in)
STANDARD: 20.002 – 20.008 mm
(0.7875 – 0.7877 in)
SERVICE LIMIT: 20.042 mm (0.7891 in)
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