3-15
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.
OVERSIZE RINGS
Oversize piston ring
The following two types of oversize piston ring are used.
They bear the following identification numbers.
Thickness gauge : 09900-20806
Micrometer(0~25 mm) : 09900-20201
Standard
0.20~0.32 mm (0.0079 0.0126 in)
0.20~0.32 mm (0.0079 0.0126 in)
Piston ring end gap(Assembling condition)
1st
2nd
Service limit
0.50 mm (0.0197 in)
0.50mm (0.0197 in)
Piston ring end gap(Assembling condition)
1st
2nd
Standard
0.970~0.990 mm
(0.0382
0.0390 in)
0.970~0.990 mm
(0.0382
0.0390 in)
Piston ring thickness
1st
05
10
2nd
05
10
Oversize piston ring
0.5 mm
1.0 mm
Oversize oil ring
The following two types of oversize oil ring are used.
They bear the following identification marks.
Color classification
Painted red
Painted yellow
Oversize oil ring
0.5 mm
1.0 mm
2nd
1st
