3-62 ENGINE
PISTON RING
• Install the piston rings in the order of oil ring, 2nd ring and top
ring.
• To install the oil ring, fit the spacer 1 first and then the side
rails 2.
7
* When inserting the spacer, take care not to have the
ends overlapped.
* The top and 2nd rings have a stamped mark on the
side. Be sure to bring the stamped mark side to the
top when assembling to the piston.
* Be careful not to cause scratch on the piston when
inserting the piston ring to the piston. Also, do not
expand the piston ring more than necessary as the
ring can break.
• When all the piston rings have been assembled, check that
each can turn smoothly.
• To minimize compression and oil leaks, locate each piston ring
end gap in the position as shown in the right illustration.
1 2nd ring/side rail (lower side)
2 Side rail (upper side)
3 Top ring/spacer
PISTON
• Apply MOLYBDENUM OIL to the piston pin.
3 MOLYBDENUM OIL
• When installing the piston, turn the mark A on the piston head
to exhaust side.
• After the piston pin has been inserted through the conrod,
install the circlip 1.
7
* Replace the circlip with a new one.
* Place a piece of rag under the piston when installing
the circlip to prevent it from falling into the crank-
case.
* The circlip end gap must be positioned so as not to
coincide with the piston pin bore cutaway.
1
2
2
“R”
“RN”
EX.
IN.
2
1
3
120°
120°
120°
1st
2nd
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