Operation0750−1/A1
Winterthur Gas & Diesel Ltd.
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2.1 Oil Care
2.1.1 System Oil
To keep the lubricating oil in good condition for long periods, good oil treatment is
necessary. To do this, a self-cleaning centrifugal separator is used.
A self-cleaning centrifugal separator is used as a purifier in bypass. The oil flows from
the oil tank through the centrifugal separator. The system oil flow rate through the
centrifugal separator is set by the manufacturer of the centrifugal separator. The
recommended oil temperature for this treatment is 95_C unless otherwise
recommended by the centrifugal separator supplier.
Solid contaminants (dirt) and water must be removed from the oil as completely as
possible. There is always a risk that water, specially sea water, can enter the system
and cause corrosion on engine parts. Water contamination can also cause bacterial
infection of the oil, which causes a decrease in lubrication and heavy corrosion of the
system. Good maintenance is the best precaution to keep water out of the oil. The
water content of the lubricating oil must not be more than 0.2% by mass during a long
period. If higher water contamination is seen, special procedures such as treatment in
the centrifugal separator, or in a renovating tank must be done.
2.1.2 Servo Oil
To increase the lifetime of the sliding parts, fine-filtered oil is used in the servo oil
system. This fine-filtered oil, which is divided from the system oil, flows through an
automatic filter which flushes back to the system oil.
The process and the low differential pressure must be monitored during the operation
of the automatic filter (see 0240−1, Usual Operation and documentation of the
automatic filter manufacturer).
The bypass filter element can be used temporarily to inspect and clean the standard
filter elements, or if these must be removed.
Make sure that the coarse and fine filters of the servo oil system are serviceable. For
more data, see the documentation of the fine filter manufacturer and paragraph 2.3.2.
2.2 Limits for Selected System Oil Parameters
You make an analysis of the selected parameters to estimate the condition of the
lubricating system oil. Regular checks can find deterioration early and procedures can
be done to correct the problems.
Make sure that the limits of the system oil are not more than those given in Table 1 for
long periods in service.
2017−08
Lubricating Oils
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