M.l
ENGINE
BODY
92.4mm STROKE SERIES
WSM,
01092
I
[3]
CRANKSHAFT
[4] PISTON
AND
PISTON RINGS
Y
A1 09FOO8
rr;i
CONNECTING
ROD
0
107FO 16
The crankshaft with the connecting rod converts
the reciprocating motion of the piston into the
rotating motion.
The crankshaft
is
made of tough special alloy
steel,
and the journals, pins and oil
seal
sliding portions are
induction hardened to increase the hardness for
higher wear resistance.
The front journal
is
supported by
a
solid type
bearing, the intermediate journal by
a
split type, and
the rear journal by
a
split type with thrust bearings.
The crankshaft
is
provided with an
oil
gallery,
through which engine oil
is
fed to
the
crank pin
portion, and lubricate
it.
The piston has
a
slightly oval shape when cold (in
consideration of thermal expansion) and
a
concave
head.
Three rings are installed in grooves in the piston.
The top ring
(1)
is
a
keystone type, which can stand
against heavy loads, and the barrel face on the ring
fits well to the cylinder wall.
The second ring
(2)
is
an undercut type, which
effectively prevents the
oil
from being carried up.
The oil ring
(3)
has chamfered contact
faces
and an
expander ring, which increase the pressure of the oil
ring against the cylinder wall.'
Several grooves
are
cut
on
the topland to help
heat
dissipate and to prevent scuffing.
(1)
TopRing
(2)
Second Ring
(3)
OilRing
(4) Depression
(5)
Valve Recess
Connecting rod
(2)
is
used to connect the piston
with the crankshaft. The big end of the connecting
rod has
a
crank pin bearing
(3)
(split type) and the
small end has
a
small end bushing
(1)
(solid type).
(1)
Small
End
Bushing
(2) Connecting Rod
(3)
Crank
pin Bearing
N-5
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