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Manual
F 240
1. General
2. Description of
engine parts
Lubricating oil
pump
(1.0).
Thermostatic
three--way valve
(1.2)
Safety overflow
valve (1.3)
Pressure
regulating valve
(1,6)
Ver. 01
LUBRICATING OIL SYSTEM
6A
6A
INTRODUCTION
INTRODUCTION
Lubrication of the engine takes place by means of an engine driven lubricating oil
pump. This self--suction pump draws oil, via a coarse filter, from the sump or a separate
oil tank. Subsequently the lubricating oil is pumped through a thermostatically
controlled three--way valve to the lubricating oil cooler or directly to the filter. After the
filter, the various engine parts are lubricated via a lubricating oil channel.
If the oil cannot run freely to the separate oil tank, because it is positioned higher than
the engine, a second engine driven pump is built on to return oil to the tank.
This paragraph is a general description of the function of engine parts in the lubricating
oil system.
The main parts of the lubricating oil system are shown in the general diagram
(paragraph 6J). These main parts have a number which corresponds to the number
in the diagram. This number is placed between brackets in the description below.
Lubrication of the engine takes place by means of an engine driven lubricating oil
pump. This self--suction pump is a vanes pump.
The lubrication oil temperature is regulated by a thermostatically controlled three--way
valve. This regulates the amount of oil going through the lubrication oil cooler, from
which it is returned to the engine.
At a cold start almost all the oil will passsing by the cooler. At a higher temperature,
a part of the oil will flowing through the cooler, and at a temperature higher than the
setting of the valve, practically all the oil will flowing through the cooler.
The max. temperature of the lubricating oil in the sump is about 85
A safety overflow valve is fitted before the filter in the thermostatic valve housing in
order to prevent filter elements from breaking because of excessively high pressure,
due to fouled filter elements. If the pressure becomes too high, the valve will open,
returning the excess oil to the engine sump.
A pressure regulating valve controling the oil pressure, is fitted after the filter and
before the main lubricating oil manifold. As soon as the oil pressure becomes too high,
the "superfluous" oil flows, via the pressure regulating valve, back to the engine sump.
As soon as the lubrication oil pressure is too low the pressure alarms will be activated.
o
C.
6 - - 1
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