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4. GENERAL DESCRIPTION OF ENGINE COMPONENTS
4-1 CYLINDER AND CRANKCASE
The cylinder and crankcase are single piece alu-
minum die-casting.
The cylinder liner, made of special cast iron, is
molded into the aluminum casting.
The intake and exhaust ports are located on one
side of the cylinder, and are also inserted into the
casting.
The crankcase has a mounting surface on the out-
put shaft side, where the main bearing cover is
attached.
4-2 MAIN BEARING COVER
The main bearing cover is an aluminum die-cast-
ing, which is mounted on the output shaft side of
the crankcase.
Remove the main bearing cover to inspect inside
of the engine.
Pilots and bosses are machined on the cover for
direct mounting of the engine onto such machines
as generators and pumps.
Oil gauges (fillers) are on both sides of the cover
for easy maintenance.
4-3 CRANKSHAFT
The crankshaft is forged carbon steel, and the
crank pin is induction-hardened.
The output end of the shaft has a crankshaft gear
that is pressed into position.
Fig. 4-1
Fig. 4-2
Fig. 4-3
Oil Gauge
Oil Gauge
Governor Gear
Crank Gear
