5-40 ENGINE TOP END
Cylinder and Piston
NOTE
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The oil ring rails have no “top” or “bottom”.
•
Install the oil ring expander [A] in t he 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 y our thumbs, but only enough to fit
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 “R” mark [B] faces up.
•
Install the second ring [C] so that the “ RN”mark[D]faces
up.
•
The piston ring openings must be positioned as shown in
the figure. 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]
F mark [E] must be faced toward Front Side for front and
rear pistons
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 t he 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.
•
Install:
Dowel Pins [A]
New Cylinder Base Gasket [B]
