WM 130/170/270 Theory of Operation
wc_tx000378gb.fm 29
6. Theory of Operation
6.1 Component Descriptions
Component Illustration Component Description
Cylinder and crankcase
The cylinder and crankcase are die-cast in alu-
minum as a single piece. A special cast iron
cylinder liner is molded into the aluminum die-
casting.
The crankcase has a mounting surface on the
output shaft side to which the main bearing
cover is attached. The cylinder is inclined to
the right at an angle of 25° from the horizontal
as viewed from the output shaft side.
Main bearing cover
The main bearing cover is an aluminum die-
casting, which is mounted on the output shaft
side of the crankcase. By removing the main
bearing cover, the inside of the engine can be
inspected with ease. There is an oil filling port,
with oil gauge, on either side of the cover.
Crankshaft
The crankshaft is made of spheroidal graphite
cast iron, and the crank pin is high-frequency
induction-hardened. The crank sprocket used
to drive the chain and the gear used to drive
the governor gear are pressed into the output
end of the shaft.
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