Hisun 700UTV - 2.3 Inspection of Cylinder, Piston and Piston Ring

15
3.Swirl the when spark plug and tighten to 18～20N.m by box
key ,then fix the spark plug cap when assembling.
2.3
2.32.3
2.3 Inspection of cylinder, piston and piston ring
Camshaft lube is injected by a hole of engine body into
cylinder ,so the hole must not jam.It is necessary to fix
the cushion and adjer without dust permeated into the crank
case before assembly.
item
standard value:mm limit value:mm
bore diameter of cylinder
φ102～φ102.03 φ102.1
taper 0.0040 0.005
out of roundness 0.0035 0.005
cylinder
degree of toruosity 0.04 0.06
external diameter of piston
φ101.95～φ101.97 φ101.92
bore diameter of piston pin
hole
φ22.002～φ22.010 φ22.010
gap between piston pin and
piston pin hole
0.007～0.020
0.02
Piston ring
end
clearance
Top ring/the
second ring
0.25～0.40
0.5
oilring
0.3～0.9
1.2
top ring
0.3～0.07
0.10
gap between
piston ring
and piston
groove
the second
ring
0.02～0.06
0.09
gap between cylinder and
piston
0.03～0.08
0.09
Piston,piston
ring and
piston pin
external diameter of piston
pin
φ21.995～φ21.990 φ21.96
bore diameter
φ22.016～φ22.027 φ22.03
connecting
rod Gap between small end of
connecting rod and piston
pin
0.016～0.033 0.035