Segway SNARLER ATV 2021 Series - Cylinder, Piston Installation

ENGINE TOP END
ENGINE TOP END
3-5-30
Cylinder, Piston Installation
Cylinder, Piston Installation
NOTE
NOTE
If a new piston or cylinder is used, check piston to
cylinder clearance (see Piston/Cylinder Clearance), and
use new piston rings.
The oil ring rails have no “top” or “bottom”.
◆
Install the oil ring expander
【
A
】
in the bottom piston
ring groove so the ends
【
B
】
butt together.
◆
Install the oil ring steel rails, one above the expander
and one below it.
○ Spread the rail with your thumbs, but only enough to
fi t the rail over the piston.
○ Release the rail into the bottom piston ring groove.
◆
Do not mix up the top ring and second ring.
◆
Install the top ring
【
A
】
so that the “A1” mark
【
B
】
faces up.
◆
Install the second ring
【
C
】
so that the “A2” mark
【
D
】
faces up.
◆
The piston ring openings must be positioned as
shown in the fi gure. The openings of the oil ring steel
rails must be about 30° ~ 40°
【
F
】
of angle from the
opening of the top ring.
Top Ring
【
A
】
Second Ring
【
B
】
Oil Ring Steel Rails
【
C
】
Oil Ring Expander
【
D
】
Note the piston orientation mark (EX) located on
top of the piston. (EX) should point toward the
exhaust side.
Opening Positions
【
G
】
◆
Fit a new piston pin snap ring into the side of the
piston so that the ring opening
【
A
】
does not
coincide with the slit
【
B
】
of the piston pin hole.
○ When installing the piston pin snap ring, compress it
only enough to install it and no more.
◆
Apply engine oil to the cylinder bore and, piston
skirt.
A
A
B
B
C
C
D
D
A
A
B
B
A
A
B
B
B
B
C
C
C
C
C
C
E
E
G
G
G
G
G
G
D
D
F
F
F
F
A
A
A
A
B
B