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5-4-2
PISTON and PISTON RING
1)
If no ring expander is available, install the rings by placing the open ring ends over the first land
of
the
piston and spreading the rings only
far
enough to slip them over the correct ring grooves.
0
Note: fay attention not to break the rings by twisting. Install the oil ring first followed by the second
ring and then top ring. Meantime, the surfaces of the second ring and the top ring with carved
marks are to be faced up.
Open ends'
of
Piston Ring
Top
Ring (chrome-plated)
Second Ring (undercut)
Oil Ring (chrome-plated)
Fig.
23
Fig.
24
2)
Reassemble the piston and connecting rod by means of the piston pin.
Note:
Apply
enough oil to the small top end of the connecting rod. Be sure to place clips on both ends
of the piston pin.
3)
When installing the connecting
rod
into place,
hold piston rings with the ring guide as shown in
Fig.
25
(if
no
ring guide is available, keep press-
ing the piston ring with finger tips and gently
strike the top of the piston with a wooden piece
or the like
to
push
it
in),
and check that the
symbol
@
or
mark
MA
on
the connecting rod
is
in the direction
of
the flywheel magneto.
Note: Apply enough oil to the piston rings, con-
necting rod plain bearings and cylinder
wall before reassembling.
Note: The open ends of the piston rings must be
90"
apart from one another on the piston
periphery.
Note: The clearance between the piston and
cyl-
inder must be measured at the piston skirt
thrust surface.
Piston Ring Guide
I
I
Fig.
25
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20
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