Piston Ring End Gap - HYOSUNG 2010 ST7 Service Manual

3-29 ENGINE

PISTON RING END GAP

INSPECTION
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 piston ring.
Piston ring end gap
(Assembly condition)
1st
2nd
Piston ring end gap(Assembly condition)
1st
2nd
Thickness gauge : 0990-20806
PISTON RING-TO-GROOVE
CLEARANCE INSPECTION
Remove carbon deposit both from the piston ring and its
groove.
Fit the piston ring into the groove. With the ring com-
pressed and lifted up, measure the clearance on the
bottom side of the ring using a thickness gauge.
Piston ring-groove clearance
1st
2nd
Piston ring-groove width
1st
2nd
Oil
Piston ring thickness
1st
2nd
Micrometer(0~25 mm) : 09900-20201
Thickness gauge : 09900-20806
Standard
0.20~0.35 mm
(0.008~0.013 in)
0.20~0.35 mm
(0.008~0.013 in)
Service limit
0.5 mm (0.020 in)
0.7 mm (0.028 in)
Service limit
0.180 mm (0.007 in)
0.150 mm (0.006 in)
Standard
1.21 ~ 1.23 mm
(0.0476 ~ 0.0484 in)
1.01 ~ 1.03 mm
(0.040 ~ 0.041 in)
2.01 ~ 2.03 mm
(0.079 ~ 0.080 in)
Standard
0.970 ~ 0.990 mm
(0.0382 ~ 0.0390 in)
1.170 ~ 1.190 mm
(0.0461 ~ 0.0469 in)