12.4
Cylinder oils
Cylinder oil is used for the functions that follow:
•
Neutralize the sulphuric acids that occur during combustion to prevent corrosion on piston
rings and cylinder liners
•
Build an oil film between the cylinder liner and the piston rings and thus decrease the friction
•
Keep the piston, the piston rings and the cylinder liners free from deposits.
The correct feed rate range for cylinder oil is between 0.6 g/kWh and 1.2 g/kWh.
12.4.1
Requirements for cylinder oil
The cylinder oil must have the basic properties that follow:
•
A high-alkaline cylinder oil of SAE 50 viscosity (minimum kinematic viscosity of 18.5 cSt at
100°C)
•
The Base Number (BN) of the cylinder oil must be related to the items that follow:
○
Engine operation condition
○
Cylinder lubricating feed rate
○
Sulphur content of the fuel.
NOTE:
The Base Number (BN), measured in mg KOH/g (test method ASTM D 2896),
gives the alkalinity of the oil. The BN of the cylinder oil is not an index for
detergency or for other properties of the cylinder oil.
You find a list of applicable and validated cylinder oils in
.
12.4.2
Recommended procedures
WinGD recommends the procedures that follow to get good performance of the piston running
components:
1
Select the cylinder oil, refer to
.
2
Do an engine screening procedure, refer to
3
Do a piston underside drain oil sampling, refer to
4
Do an interpretation of the oil analysis as follows:
•
For a cylinder oil with BN 25 or lower refer to
.
•
For a cylinder oil with BN 40 or higher refer to
.
5
Do an optimization of the feed rate, refer to
6
Regularly do step 3 to step 5 again.
X52
AA00-0000-00AAA-030G-A
Operation Manual
Cylinder oils
Winterthur Gas & Diesel Ltd.
- 454 -
Issue 002 2018-11
