31
Measure outer diameter at positon by 5mm above
bottom of piston skirt.
Standard
：
77.950
～
77.97
Limit
：
77.805
Calculate clearance between cylinder and piston
Limit
：
0.12
Measure diameter of hole of piston pin
：
Standard
：
17.002
～
17.008
Limit
：
17.04
Measure outer diameter of piston pin
：
Standard
：
16.994.0
～
17.000
Limit
：
16.96
Installation for piston rings
Completely wash and clean up grooves
for piston ring, and then install rings.
Caution: No damage on piston and its rings
during installation is allowed
The side with mark of rings face upwards.
Flexible turning of piston ring is needed after
installed.
No opposite installation for top and 2
nd
ring is
allowed
Issues need pay attention during installaion
：
Opening on 1
st
ring face to direction of exhaust
；
Opening on 2
nd
ring and oil ring face to air intake
；
Interval between openings on 1
st
ring and 2 blade
rings should be
（
30
～
40
）
degree.
Oil ring made of three pieces, whose interval
only need match to clearance of spacing ring.
install spacing ring first and then blade ring
when installing oil ring.