The letters refer to list of ‘Counterflanges’
Cylinder Lubricating Oil System
The cost of the cylinder lubricating oil is one of the
largest contributions to total operating costs, next
to the fuel oil cost. Another aspect is that the lu-
brication rate has a great influence on the cylinder
condition, and thus on the overhauling schedules
and maintenance costs.
It is therefore of the utmost importance that the
cylinder lubricating oil system as well as its opera-
tion is optimised.
Cylinder oils
In short, MAN Diesel and Turbo recommends the
use of cylinder oils with the following main proper-
ties:
• SAE 50 viscosity grade
• high detergency
• BN 100 for high-sulphur fuel
• BN 40 for low-sulphur fuel.
A BN 100 cylinder oil is to be used as the default
choice of oil and it may be used on all fuel types.
However, in case of the engine running on fuel
with sulphur content lower than 1.5% for more
than 2 weeks, we recommend to change to a
lower BN cylinder oil such as a BN 40.
Two-tank cylinder oil supply system
Fig. 9.01.01 shows a cylinder oil supply system
with separate tanks for cylinder oils with high and
low BN.
Cylinder oil feed rate (dosage)
Adjustment of the cylinder oil dosage to the sul-
phur content in the fuel being burnt is further ex-
plained in Section 9.02.
Further information about cylinder lubrication on
different fuel types is available in our publication:
Operation on Low-Sulphur Fuels
The publication is available at www.marine.man.
eu → ’Two-Stroke’ → ’Technical Papers’.
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