Operation
0750−1/A1
Winterthur Gas & Diesel Ltd.
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Note: Monitor the piston underside residual BN of the cylinder lubricating oil
and examine the piston rings and cylinder liners. This makes sure that
you select the applicable BN oil, set the best oil feed rate, prevent
corrosion and excessive piston crown deposits and top land deposits.
For more data, see 7218−1 Cylinder Lubrication and 7218−3 Feed Rate −
Adjustment.
Cylinder lubricating oils that have a BN that is too high for the fuel sulphur content can
cause too much deposits on the piston crown. Piston crown deposits must be
carefully monitored through scavenge port inspections. The deposits can cause the
lubricant film to break down, which gives excessive liner, piston and piston ring wear.
BN 40 cylinder lubricating oils have neutral additives (low BN) to increase the
detergency level and thermal stability to the level of a BN 70 cylinder lubricating oil.
No significant increase in corrosive cylinder liner and piston ring wear is to be
expected when BN 40 cylinder lubricating oils are used (up to 1.5% m/m sulphur)
when the cylinder lubricating oil feed rate is kept high. You must make sure that the
cylinder lubrication feed rate is applicable (maximum 1.2 g/kWh) and related to the
data from the analysis (residual base number) of the piston underside drain oil.
BN 40 lubricating oils cause less and softer deposits on the piston crown land and in
exhaust areas (e.g. on the turbocharger nozzle ring) in relation to the BN 70 and other
higher BN products at the same feed rate.
The BN 40 products can also be used safely with HFO that has a sulphur content in
the range 0.5% m/m to 1.5% m/m. It is possible that the feed rate must be increased
in relation to the remaining BN measured in the piston underside drain oil or
scrape-down samples.
There are intermediate (between BN 50 and BN 60) and other BN cylinder lubricating
oils available. To use these cylinder lubricating oils, make sure that their performance
is monitored regularly. Also, make sure that the cylinder lubricating oil feed rate is
adjusted to prevent a piston underside BN that is too low. Incorrectly adjusted piston
underside BN can cause high corrosive wear and scuffing (see the limits and
recommendations in paragraph 3.2).
Note: Use only the cylinder lubricating oils given in paragraph 8.2. The oil
company assumes all responsibility for the performance of the cylinder
lubricating oils in service of all WinGD 2-stroke engines to the exclusion
of any liability of any WinGD company belonging to the WinGD group.
The oil company and other possible manufacturers and distributors of
the products in question shall indemnify, compensate and hold free from
liability, WinGD and companies belonging to the WinGD group from and
against any claims, damages and losses caused by the cylinder
lubricating oils in question.
To prevent problems with fuel sulphur content, keep sufficient fuel from the bunker
supplied before. This can be used until an analysis of the sulphur content of the new
bunker is received. The results of the bunker analysis and the values given in the
Bunker Delivery Note (BDN) can be different. Always use the higher sulphur content
value to set the feed rate to make sure that the engine operates safely.
2017−08
Lubricating Oils
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