HYOSUNG TE450 -, Service Manual

Page: 72 / 262

ENGINE 3-30
▣ ▣
PISTON RING FREE END GAP INSPE-
CTION
Before installing piston rings, measure the free end
gap of each ring using vernier calipers. If the gap is
less than the service limit, replace the ring.
▣ ▣ PISTON PIN DIAMETER INSPECTION
Using a micrometer, measure the piston pin outside
diameter at three position, both the ends and the
center.
If any of the measurements is founds less than the
service limit, replace the pin with a new one.
Piston pin diameter
Service limit
18.980 mm (0.7472 in)
Piston ring free end gap Standard
Approx 11 mm (0.433 in)
Approx 10 mm (0.394 in)
1st
2nd
▣ ▣
PISTON RING END GAP INSPECTION
(Assembly condition)
Insert the piston ring squarely into the cylinder using
the piston head.
Measure the end gap with a thickness gauge.
If the gap exceeds the service limit, replace the pis-
ton ring with a new one.
Piston ring end gap
(Assembly condition)
Standard
0.25 ~ 0.40 mm
(0.010 ~ 0.016 in)
0.40 ~ 0.55 mm
(0.016 ~ 0.022 in)
2nd
1st
Piston ring end gap(Assembly condition)
1st
2nd
Service limit
0.5 mm (0.020 in)
0.7 mm (0.028 in)
Micrometer(0~25 mm) : 09900-20201
Vernier calipers : 09900-20101
Thickness gauge : 0990-20806
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