Honda GX240RT2 Service And Repair Manual page 164

gx240ut2_gx270ut2_gx340ut2_gx390ut2
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.
GX240/GX270
STANDARD: 17.994 – 18.000 mm
(0.7084 – 0.7087 in)
SERVICE LIMIT: 17.95 mm (0.707 in)
GX340/GX390
STANDARD: 19.994 – 20.000 mm
(0.7872 – 0.7874 in)
SERVICE LIMIT: 19.950 mm (0.7854 in)
If the measurement is less than the service limit,
replace the piston pin (page 13-12)
Inspect the piston pin bore I.D.
Inspect the connecting rod small end I. D.
with this inspection.
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 13-12)
clearance.
If the clearance is still more than the service limit with
the new piston pin, replace the piston
PISTON RING SIDE CLEARANCE
Measure the clearance between each piston ring and
ring groove of the piston using a feeler gauge.
STANDARD:
Top (GX240/GX270):
Top (GX340/GX390):
Second:
SERVICE LIMIT:
Top/second:
If any of the measurements is more than the service
limit, inspect the piston ring width.
If the piston ring width is normal, replace the piston
(page 13-12) and reinspect the clearance.
If necessary, replace the piston rings (top, second, oil)
as a set (page 13-12) 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 13-12).
(page 13-14).
(page 13-17)
and recheck the
(page 13-12).
0.030 – 0.060 mm
(0.0012 – 0.0024 in)
0.015 – 0.060 mm
(0.0006 – 0.0024 in)
0.030 – 0.060 mm
(0.0012 – 0.0024 in)
0.15 mm (0.006 in)
CRANKCASE