LUBRICATION SYSTEM
-
Description
LU-3
A pressure feeding lubrication system has been
adopted to supply oil to the moving parts of this
engine. The lubrication system consists of an oil
pan, oil pump, oil filter and other external parts
which supply oil to the moving parts in the engine
block. The oil circuit
is
shown in the illustration
at
the top of the previous page. Oil from the oil pan
is
pumped up by the oil pump. After
it
passes
through the oil filter,
it
is
fed through the various
oil holes in the crankshaft and cylinder block.
After passing through the cylinder block and per-
forming
its
lubricating function, the oil
is
returned
by gravity to the oil pan. A dipstick on the center
left side of the cylinder block
is
provided to check
the oil level.
-.
OIL PUMP
The oil pump pumps up oil from the oil pan and
sends
it
under pressure to the various parts of the
engine. An oil strainer
is
mounted in front of the
inlet to the oil pump to remove impurities. The oil
pump itself
is
a
trochoid type pump, which uses
a
drive rotor and driven rotor inside the pump body.
When the drive rotor rotates, the driven rotor
rotates in the same direction. The axis of the
drive rotor shaft
is
different from the center of
I
the driven rotor, so when both rotors rotate, the
space between the two rotors changes. Oil
is
,
drawn in when the space widens and
is
discharged
I
when the space becomes narrow.
I
I
OIL PRESSURE REGULATOR (RELIEF VALVE)
At high engine speeds, the oil pump supplies
more oil to each part that
is
necessary. For this
reason, an oil pressure regulator which works to
prevent oversupply of oil
is
installed on the oil
pump. During normal oil supply,
a
coil spring and
valve keep the by-pass closed, but when too much
oil
is
being supplied, the pressure becomes ex-
tremely high, overpowering the force of the spring
and opening the valves. This allows the excess oil
to flow through the valve and return to the inlet of
the oil pump.
OIL FILTER
*
There are two types of oil filter, a full flow type
and a by-pass element type. A full flow type has
a
relief valve built into the paper filter element.
Particles of metal from wear, airborn dirt, carbon
and other impurities can get in the oil during use
and could cause accelerated wear or seizing if
allowed to circulate through the engine. The oil
filter, integrated into the oil line, removes these
impurities as the oil passes through
it.
The filter
is
mounted outside the engine to simplify replace-
ment of the filter element. A relief valve
is
also
included ahead of the filter element to relieve the
high oil pressure in case the filter element becomes
clogged with impurities. The relief valve opens
when the oil pressure overpowers the force of the
spring. Oil passing through the relief valve by-
passes the oil filter and flows directly into the main
oil hole in the engine.
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