Makita EM4251 Service Manual Page 26

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5 - 3 - 2 Connecting rod, Piston and Piston ring
Installing the piston on the connecting rod
(1) After installing piston rings, apply 4-cycle engine oil on the ring portion and wait for the oil
to infiltrate around the ring.
Note 1
The top ring and second ring have to be
so installed that their cut portions position against
each other as illustrated in Fig. 5-SP.
Note 2
When installing a new second ring, the white mark
near the cut portion has to come on the right side
(recoil starter side) as illustrated in Fig. 5-26.
And when installing used one, install it
with the working face down.
Fig. 5-SP
Cut portions of
piston ring (Second ring)
Cut portions of
piston ring (Top ring)
180
°
Piston
(1)
(2)
(3)
Top ring
Second
ring
Oil ring
Barrel
Taper
Three-Piece
assembly
(1)
(2)
(3)
Fig. 5-25
Fig. 5-26
Fig. 5-27
Assemble the rings to piston
as per the illustration below.
Piston
Recoil starter
side
Flywheel
side
The white mark on
the second ring
Piston ring (Top ring)
Piston ring (Second ring)
Oil ring
Clip
Clip
Crank
shaft
Piston pin
Piston
Apply grease on
the inner face.
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