Cylinder And Crankcase; Main Bearing Cover - Robin DY23-2D Service Manual

4. GENERAL DESCRIPTION OF ENGINE CONST
4 - 1 CYLINDER AND CRANKCASE
The cylinder and crankcase are single piece
aluminum die casting. The cylinder liner,
made of special cast iron, is built into
the alminum casting.
The crankcase is separable
on
the output
shaft side, where the main bearing cover
is attached to
it. (See 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)
4- 3 CRANKSHAFT
Crankshaft is made from forged carbon
steel and its crankpin and journal are
induct ion
-
hardened.
Crankshaft is supported by a ball bearing
a t flywheel side and a kelmet bearing a t
P.T.0: side.
A passage for lubricating oil is provided
through the journal and crankpin to
lubricate the large end bearing of
connecting rod.
The crank gear is pressure-fitted on the
P.T.O. side of the crankshaft.
A balancer gear is also pressure-fitted
for the engines with optional balancer.
(See Fig. 3.)
~~
FIG. 2
FIG. 3
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