Optimum BN in this kind of operation depends on the length of operating periods on both fuel
qualities as well as of sulphur content of fuels in question. Thus in particular cases BN 40 or
even higher BN lubricating oils should be used.
If Ultra Low Sulphur Fuel Oils (ULSFO) with sulphur content of max. 0,10 % m/m being classed
as residual fuels are used, the use of BN 20 lubricating oil is allowed.
Different oil brands may not be blended, unless it is approved by the oil suppliers. Blending
of different oils must also be validated by Wärtsilä, if the engine is still under warranty.
An updated list of validated lubricating oils is supplied for every installation. Please refer to
Service Bulletin WS15S475.
7.1.2 Oil in speed governor or actuator
An oil of viscosity class SAE 30 or SAE 40 is acceptable in normal operating conditions. Usually
the same oil as in the engine can be used. At low ambient temperatures it may be necessary
to use a multigrade oil (e.g. SAE 5W-40) to ensure proper operation during start-up with cold
oil.
7.1.3 Oil in turning device
It is recommended to use EP-gear oils, viscosity 400-500 cSt at 40°C = ISO VG 460.
An updated list of approved oils is supplied for every installation.
7.2 Internal lubricating oil system
Fig 7-1 Internal lubricating oil system, in-line engine (DAAF422227)
System components
Crankcase breather06Main lubricating oil pump (engine driven)01
VIC - Control valve, CV38107Lubricating oil cooler02
VIC - Variable inlet valve closing08Lubricating oil automatic filter03
Vic-Half VIC Activation, CV38209Centifugal filter for indication04
Pressure valve for 3-Timing VIC10Turbocharger05
©* If engine is equipped with 3-Timing VIC
7-2 DAAB605814
Wärtsilä 46F Product Guide7. Lubricating Oil System
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