- 7 -
(b) When the engine is tilted muffler side down.
In the same way as that of the carburetor side
down, the return path in the rocker arm com-
partment and the pressure relief hole operate
and return the stagnant oil into the crankcase.
(c) Engine tilted back and forth
The breather hole located inside the rocker arm
compartment is arranged approximately at the
center of the rocker arm compartment, so as
to prevent stagnant lubricant oil from being
gushed out at either back or forth inclined po-
sition. The stagnant oil is sucked back into the
crankcase through the return path.
(d) Upside down position
Basically, it is presumed that the engine is not
used (is not required to operate) continuously
in the upside down position, and only the prac-
tical tilted positions are taken into consideration
as priorities. Measures are adopted, however,
so that the engine can be run for a short time
in upside down positions during the work and/
or during idling.
The oil return passage tube at the muffler side
is extended up to the rocker arm cover in or-
der to suck the oil that stagnates in the rocker
arm compartment while the engine is in the
upside down position. At that time, the pres-
sure relief hole located inside the oil tank is
closed by the check ball, so as to prevent oil
from back flowing from the oil tank.
Lubrication inside the cylinder is carried out with a sufficient volume of oil, irrespective of the position of
the engine, and there is no risk of engine seizure, wear and other similar problems caused by improper
lubrication. The oil volume supplied into the cam gear compartment and into the rocker arm compart-
ment is limited to an appropriate amount, to minimize the oil consumption.
Fig. 3-4
Fig. 3-3
