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M20/M282/M332C/M452/M453C/M551/M552C/M601/M601C
4.
Self cleaning fuel filter HF4
For fuel, filter elements with a mesh size of 10 µm are required.
In the event of filter alarm, which is activated between the flushing intervals if the differential
pressure is accessive, the operation of the separators must be checked and the filter cleaned
(for servicing instructions see the documents from the manufacturer).
5.
Day tank HT 1
The day tank is designed to collect the treated fuel, for a minimum of hours full load
operation. If the treatment plant is in order, it will always be filled to the overflow level. (No
formation of water condensation)
• Daily de-sludging is important.
• A temperature level between 80 - 95 °C should be maintained.
6.
Fuel pressure pump HP1, HP2
The fuel pump pressurizes the mixing tank. The pump relief valve has to be closed in
operation.
Test procedure:
The system pressure must not rise when increasing the valve spring load.
7.
Fuel pressure-regulating valve HR1
This valve is installed in the excess return line and must be set so that the pressure at the
engine is of that required (see technical data A1.05).
8.
Mixing tank HT2
This tank has a level monitor. In the event of alarm and/or when filling the tank, open the vent
valve for a short time by hand.
9.
Circulating pump HP3, HP4
This pump has been designed like a force pump. Check that the relief valve is closed as
described in (6).
en / 19.08.1996
Instructions for heavy fuel Operation
Care and supervision / Engine fuel
BA000010
A3.04.07.01
3/4
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