3-66 ENGINE
Oversize piston ring
The following two types of oversize piston rings are used.
They bear the following identification numbers.
1st 2nd
0.5 mm 50 50
1.0 mm 100 100
Oversize oil ring
The following two types of oversize oil rings are available as op-
tional parts. They bear the following identification marks.
SIZE COLOR
STD NIL
0.5 mm O.S. RED
1.0 mm O.S. YELLOW
Oversize side rail
Measure the outside diameter to identify the size.
PISTON PINS AND PIN BORE
Measure the piston pin bore inside diameter using the small bore
gauge. If either is out of specification or the difference between
these measurement is more than the limits, replace the piston.
" 09900-20602: Dial gauge (1/1000 mm)
09900-22403: Small bore gauge (18 – 35 mm)
# Piston pin bore I.D.
Service Limit: 18.030 mm (0.7098 in)
PISTON RING INSTALLATION
• Install the oil ring first, then the 2nd ring and finally the 1st ring.
NOTE:
The 1st
1
and 2nd piston rings
2
differ in shape.
Measure the piston pin outside diameter at three positions using
the micrometer. If any of the measurements are out of specifica-
tion, replace the piston pin.
" 09900-20205: Micrometer (0 – 25 mm)
# Piston pin O.D.
Service Limit: 17.980 mm (0.7079 in)
0.5 mm
O.S.
1.0 mm
O.S.
Paint
Oil ring
spacer
2
1
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