FEATURES
A
compact, lightweight and durable 4-cycle air-cooled engine with high power output,
embodying ingenious design technique and advanced production skill.
n
Simple construction, smart appearance, easy
start.
Reliable power for wide. variety of purposes, with smooth speed controll by
a
governor,
under varying
load
conditions.
Economical advantage through low fuel consumption.
Great versatility in installation through
a
360°
belt
extension possibility and
a
two side
oil
fill and drain arrangement.
GENERAL DESCRIPTJON
of
ENGINE CONSTRUCTION
CYLINDER, CRANKCASE
The
cylinder and
the
crankcase
are
die-cast
as
a
compact aluminium mono-block piece.
The
cylinder liner and
the
valve
seats
are
made of special alloy
cast
iron and
are
imbedded in
the
aluminium casting
as
inserts. The intake and exhaust ports
are
located
at
one side
of
the
cylinder and
are
also
made
of
inserted pieces in
the
casting.
The crankcase
is
separable
at
the driving
shaft
side and this separable piece constitutes
the
main bearing cover.
4-2
MAIN BEARING COVER
As
the aluminium die-cast main bearing cover
is
built onto the crankcase on the driving shaft
side, the engine 'inside
are
reached
for inspection, easily by simply removing it. It
is
also
provided with
a
flange and
boss
for directly mounting operating machines such
as
generators
and pumps.
There
are
two
oil filters serving also
as
oil gauges provided
at
two locations.
(However, in
EY18-3
or
EY23
engine,
at
one location in
the
carburetor
side.)
4-3
CRANKSHAFT
The crankshaft is machined from
a
carbon
steel
forging with
an
induction hardened crank pin.
On
the
fan side,
the
breaker
cam is provided and on
the
driving side,
the
crankshaft
gear
is
force-fit.
44
CONNECTING ROD
and
PISTON
The connecting rod
is
machined from an aluminium alloy forging in which the
forged
alloy itself
serves
as
the
bearing metal
at
both
ends. On
the
large end, an oil scraper
for
splashing
the
lubricating
oil
is
provided.
The piston is machined from an aluminium alloy casting and
is
provided with two grooves
for
compression rings and one groove
for
the
oil ring.
4-5
CAMSHAFT
The camshaft is machined from
a
carbon
steel
forging with integral intake and exhaust cams
and
is
provided with
a
force-fit cam gear.
In
the
model
B
engine,
the
camshaft
serves
also
as
the
driving shaft, being driven
at
half
the
crankshaft speed.
In
the
EY14D, EY23D, EY25-2D
and
EY27-2D
engines,
the
camshaft is machined from
a
special alloy
cast
iron with an integral
camshaft
gear,
and is supported by aluminium bearing metals machined integral with
the
crankcase
at
both ends. (no
ball
bearing is used)
n
-4
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