60
Fig.78
Fig.79
Fig80
——Check and make sure that the oil injection hole of the connecting rod large end is not blocked. The
outside diameter is
φ
1mm. Installation: ——Need not to divide into groups for the piston weight, piston
pin holes and the accessory piston skirt. Before assembling, check the piston head mark and make sure that
it is in accord with cylinder No.4.
——Heat the small end of connecting rod to 230
°
—400
℃
, and apply SAE50 engine oil or
graphite colloid oil on the outer circumference of the piston pin hole. Then press the piston pin into the
hole of connecting rod small end and piston pin. One end of the piston pin may be 0.7mm mostly out of the
pin hole or 0.3mm mostly in the seat. And plug the other end of it into the pin seat. The piston head means
the front arrow. The outer end of piston pin means the front lug, which should has a same direction with
“F”near the large end of the
connecting rod.(with ‘480’mark on some blanks and the mark side forward.)
——After the piston, piston pin, and the connecting rod are put together, print and sculpture the cylinder
numbers with the 3mm words on the top of piston, the connecting rod and the left side of rod cap (viewed
from the front). Be sure not to be deformed on the connecting side during printing.
——The dimension of piston ring.
478 piston ring
480 piston ring
Paint marker (group)
Size of
gauge
Paint marker
(group)
Size of
gauge
Yellow paint +no paint
(standard)
77.22
No paint
(standard)
79.94
Yellow paint+ purple
paint (oversize 0.29)
77.51
Purple paint
(oversize 0.29)
80.23
Yellow paint +blue paint
(oversize 0.5)
77.72
Blue paint
(oversize 0.5)
80.44
——When installing the piston ring, the mark side should be put up and the second compression ring
