Treatment and maintenance of lubricating oil
General
During operation of trunk engines the lubricating oil will gradually be contami-
nated by small particles originating from the combustion.
Engines operated on heavy fuels will normally increase the contamination
due to the increased content of carbon residues and other contaminants.
Contamination of lubricating oil with either freshwater or seawater can also
occur.
A certain amount of contaminants can be kept suspended in the lubricating
oil without affecting the lubricating properties.
The condition of the lubricating oil must be kept under observation (on a reg-
ular basis) by analyzing oil samples.
See Section 504.04 "Criteria for Clean-
ing/Exchange of Lubricating Oil"
.
The moving parts in the engine are protected by the built-on duplex full-flow
lubricating oil filter. The replaceable paper filter cartridges in each filter cham-
ber has a fineness of 10-15 microns. The safety filter, at the centre of each
filter chamber, is a basket filter element, with a fineness of 60 microns
(sphere passing mesh).
The pressure drop across the replaceable paper filter cartridges is one
parameter indicating the contamination level. The higher the dirt content in
the oil, the shorter the periods between filter cartridge replacement and
cleaning.
The condition of the lubricating oil can be maintained / re-established by
exchanging the lubricating oil at fixed intervals or based on analyzing oil sam-
ples.
Operation on Marine Diesel Oil (MDO) & Marine Gas Oil (MGO)
For engines exclusively operated on MDO/MGO we recommend to install a
built-on centrifugal bypass filter as an additional filter to the built-on full flow
depth filter.
It is advisable to run bypass separator units continuously for engines oper-
ated on MDO/MGO as separator units present the best cleaning solution.
Mesh filters have the disadvantage that they cannot remove water and their
elements clog quickly.
Operation on Heavy Fuel Oil (HFO)
HFO-operated engines require effective lubricating oil cleaning. In order to
ensure a safe operation it is necessary to use supplementary cleaning equip-
ment together with the built-on full flow depth filter.
It is mandatory to run bypass separator units continuously for engines oper-
ated on HFO, as an optimal lubricating oil treatment is fundamental for a reli-
able working condition. Therefore it is mandatory to clean the lubricating oil
with a bypass separator unit, so that the wear rates are reduced and the life-
time of the engine is extended.
2016-02-26 - en
Description
Treatment and maintenance of lubricating oil
1643494-3.11
MAN Diesel & Turbo
B 12 15 0
L28/32S; L27/38S; L23/30S; L21/31S; L16/24S; L23/30DF; V28/32S-DF;
L28/32DF; V28/32H; V28/32S; L16/24; L21/31; L23/30H; L27/38;
L28/32H EN
1 (11)
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