The connecting rod is made of aluminum die casting,
which itself serves as bearings at both the large and
small ends. The large end cap and the oil scraper are
moulded in a unit for splashing the lubricating oil.
The piston is cast
of
aluminum alloy, and has grooves
for receiving two compression rings and one
oil
ring.
(See Fig.
5.)
4-4
CONNECTING ROD
and
PISTON
4-5 CAMSHAFT
In the EY08D engine, the camshaft is integrally built
with a cam gear of special cast iron, and has intake
and exhaust cams. Also the camshaft has aluminum
plain bearings attached to both ends.
(No
ball bear-
ing is used.) (See Fig.
6.)
In the EY08BN engine, the camshaft is forged of car-
bon steel and is provided with a force-fit cam gear.
@
It serves also
as
the driving shaft, being driven at half
the crankshaft speed, and a ball bearing is used at
the P.T.O. shaft side.
4-6
VALVE ARRANGEMENT
The intake valve is located upstream
of
the cooling
air with the result that the carburetor is intensively
cooled. (See Fig.
7.)
Top
Ring
Second Ring
Oil
Ring
Connecting
Rod
Oil
Scraper
\I
L
Fig.
5
:
Fig.
6
Direction
of
Cooling
Wind
Fig.
7
-5-
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