EY15V, EY20V - Small Engine Discount

4. GENERAL DESCRIPTION of ENGINE CONSTRUCTION
4-1 CYLINDER, 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 intake
and exhaust ports are located on one side of
the cylinder, and are also inserted into the casting.
The crankcase is separable on the output shaft side,
where the main bearing cover is attached to it.
(See Fig. I .)
4-2 MAIN BEARING COVER Fig. 1
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 on the machines.
Two oil drains are also available. (See Fig. 2 and Fig. 3.)
Oil
r
Governor Gear
Fig. 2
Fig. 3
4-3 CRANKSHAFT
The crankshaft is forged of carbon steel, and the
crankpin is induction-hardened. It has a crank gear
and a oil scraper press-fitted on the output end.
(See Fig. 4.)
Induction Hardening
/(Portion of Crankpin)
Crank Gear /
(Press-fit)
\ O;I Scraper
(Press-fit)
-4 -
Fig. 4