Subaru ER12 - 4. General Description of Engine Components; 4-1 Cylinder and Crankcase; 4-2 Main Bearing Cover; 4-3 Crankshaft

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4. GENERAL DESCRIPTION OF ENGINE COMPONENTS
4-1 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
And the lib is made for the crankcase room center
cum oil shelter plate, that improvement breather
function and strength up
And inside of the crankcase has large rib for oil shelter
which to inprove the breather function and stiffness
4-2 MAIN BEARING COVER
The main bearing cover is an aluminum die-casting
with heavy-duty structure to endure to install on
rammers, 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 for
direct mounting of the engine onto rammers
And it have suction pipe, oil pump, oil filter and oil
pressure switch
4-3 CRANKSHAFT
The crankshaft is forged carbon steel, and the crank
pin is high-frequency inductionhardened
The crank pulley used to drive the timing belt and the
gear used to drive the governor gear are pressed into
the output end of the shaft
4-4 CONNECTING ROD AND PISTON
The connecting rod is a specially heat-treated
aluminum alloy die-casting Its large and small ends
function as bearings The piston is an aluminum alloy
casting with grooves for mounting one compression
ring and one oil ring
JCC