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7-4
LUBRICATION SYSTEM
and
OIL
PUMP
Lubrication
is
forced lubrication
and
wholly fdtered system by trochoid type oil pump. The oil pump, and the governor are
assembled in one piece, which
is
fitted to the crankcase.
Revolution of the crankshaft is reduced by the reduction gear
(1
:
1.4)
of the pump; and from the
main
gallery oil
is
forcibly
lubricated to the crank journal. That
oil
will
further be supplied to the crankpin, large end of the connecting rod, and then
splashed to the piston, small end of the connecting,rod, cylinder, etc. Also from the main gallery oil
is
forcibly supplied to
the cam shaft bearing and is sent to cam lobe
of
intake and exhaust valves and lubricate the tappets.
In
the camshaft
oil
relief valve is assembled, and it adjusts the
oil
pressure at
3
kg/cm2. Lubrication
in
the rocker chamber is conducted by the
splash of
oil
pushed up by blow-by gas, which lubricates rocker arm, etc.
Furthermore, blow-by gas containing oil
will
pass through the breather, intake port and the cylinder, where
it
is finally burnt.
LUBRICATION CHART
r
I
r
I
BREATHER
1-1
INTAK: PORT1
I
t
COMBUSTION
I
*
t
1
I
$=I”!
CYLINDER
k’
PISTON, BEARING
SMALL END
OIL FILTER
Fig.
68
7-5.
OIL
FILTER
Oil
filter
is
made of double sheets of wire netting, and it
is
less flow resistance type, and
is
called full-flow type. As the
element
is
made
of
wire, it can be washed and used for many times.
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38
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