4.
GENERAL DESCRIPTION
of
ENGINE CONSTRUCTION
4-1
CYLINDER, CRANKCASE
The cylinder and crankcase are single piece alumi-
num die casting. The cylinder liner, made of special
cast iron, is built into the alminum casting. The
in-
take and exhaust ports are located on one side
of
the cylinder, and are also inserted into the casting.
The crankcase is separable on the output shaft side,
where the main bearing cover
is
attached to it.
(See Fig.
1
.)
Fig.
1
4-2
MAIN
BEARING
COVER
The main bearing cover made
of
aluminum die casting is built onto the output shaft side
of
the crankcase
so
that the inside of the engine can readily be checked by simply removing the cover. It is provided with a flange
and boss for directly mounting machines,
such
as
generators and pumps.
Two oil gauges also serving
as
oil filler caps can be mounted. (See
Fig.
2
and
Fig.
3.)
Oi
I
Ring
for Centering
!ID
Oil
Gauge
Fig.
2
4-3
CRANKSHAFT
The crankshaft is forged of carbon steel, and the
crankpin
is
induction-hardened. It has a crank gear
pressure-fitted on the output end. (See
Fig.
4.)
Fig.
3
~~
Induction Hardening
(Portion of Crankpin)
\
Crank Gear (Pressure-fit)
Fig.
4
-4-
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