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3.
FEATURES
,
,
1.
The overhead valve design offers
a
compactness, light weight and ideal combustion characteristics
2.
An
optimum lubrication and better tilted operation thanks to upright cylinder design.
3.
A crossflow arrangement
of
intake and exhaust ports ensures stable performance under high ambient
temperature.
4.
The automatic decompressiom system lightens
the
recoil pull force by
40%
comparing to the
conventional
SV
engines.
5.
An easy operation thanks to integrated engine control system.
Improved throttle mechanism
is
adopted for easy starting.
6.
Combustion and mechanical noises have been analyzed acoustically and improved for better tonal
quality and lower engine noise.
7.
Optimally designed reciprocating parts reduce the vibration level of the engine.
EH25-2
engine
equips single through-balancer shaft as an option.
resulting in more power from Iess fuel and prolonged engine life.
4.
GENERAL DESCRIPTION
OF
ENGINE COMPONENTS
4-1
CYLINDER
AND
CRANKCASE
The cylinder and crankcase
is
single piece aluminum
diecasting. The cylinder liner, made of special cast
iron,
is
molded into the aluminum casting.
The crankcase has a mounting surface. on the output
shaft side, where the main bearing cover is attached.
4-2
MAIN
BEARING
COVER
The main bearing cover
is
an aluminum diecasting,
which
is
mounted on the output shaft side of the
crankcase.
Remove the main bearing cover to inspect the inside
of
the engine.
The pilots and bosses are machined on the cover for
direct mounting of the engine onto such machines
as
generators and pumps.
Oil gauge (fillers) are on both sides of the cover for
easy maintenance.
Fig.
4-1
OIL GAUGE
OIL
GAUGE
/"-
\
/"
Fig.
4-2
-8-