3.7. Fuel System
The fuel is delivered by the fuel feed pump via the fuel filter to the injection pump and from there
to the injection nozzles.
The fuel is sprayed into the cylinders through nozzles fitted in screw-fit injection nozzle holders
in the cylinder heads.
Excessively delivered fuel and leak fuel from the nozzle flow through the return pipe back to the
tank.
A strainer is arranged ahead of the fuel feed pump.
3.7.1. Fuel filter
This fuel filter has two functions not only
oil filtering but also water separating
Before entering the suction chamber of
the injection pump, the fuel is cleaned in a
strainer of fuel feed pump and a fuel filter.
Drain water in cartridge with loosening
the cock under filter manually (6) from
time to time.
The fuel filter should be replaced at
every 400 hours.
3.7.2. Fuel requirements
DAEWOO marine diesel engines was designed to use Number 2-D diesel fuel or equivalent
that meets specification DIN 51601-DK. For maximum fuel economy, Number 2-D fuel when-
ever possible. When temperatures are below -7
˚C
(20
˚F
), use Number 1-D fuel. If Number 1-
D fuel is not available, the mixture of one kerosene to two gallons of Number 2-D fuel can be
used. Once kerosene has been added, the engine should be run for several minutes to mix the
fuel.
3.7.3. How to select fuel oil
Fuel quality is an important factor in obtaining satisfactory engine performance, long engine
life, and acceptable exhaust emission levels. DAEWOO engines are designed to operate on
most diesel fuels marketed today. In general, fuels meeting the properties of ASTM Designation
D975 (grades 1-D and 2-D) have provided satisfactory performance.
The ASTM 975 specification, however, does not in itself adequately define the fuel character-
istics needed for assurance of fuel quality.
The properties listed in the fuel oil selection chart below have provided optimum engine per-
formance. Grade 2-D fuel is normally available for generator service. Grade 1-D fuel should not
be used in pleasure craft engines, except in an emergency.
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