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2. GENERAL DESCRIPTION OF ENGINE COMPONENTS
2-1 CYLINDER AND CRANKCASE
The cylinder and crankcase are aluminum die-casting
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
degrees from the horizontal as viewed from the output
shaft side .
2-2 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 .
Pilots and bosses are machined into the cover
to facilitate the direct coupling of the engine with
machines such as generators and pumps .
Oil gauges (fillers) are on both sides of the cover for
easy maintenance .
2-3 CRANKSHAFT
The crankshaft is forged carbon steel, and the crank
pin is high-frequency inductionhardened .
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 .
2-4 CONNECTING ROD AND PISTON
The connecting rod is a specially heat-treated
aluminum alloy die-casting . Its large and small ends
function as bearings . A splasher built into the
connecting rod lubricates by splashing engine oil .
The piston is an aluminum alloy casting with grooves
for mounting one compression ring and one oil ring .
Fig .2-1
Fig .2-2
Fig .2-3
25
°
Fig .2-4
