BLACK SPOTS ON CYLINDER LINERS OF 2-STROKE ENGINES
- Details
- Category: Service Letters
- Written by Infomarine On Line
Occasionally patches of black deposits appear on the cylinder liner wall of 2-stroke engines. The black spots typically appear in the mid-stroke area of the liner, roughly between the oil quills and the scavenge ports.
Analysis shows the deposits mainly consist of Calcium Sulphate, some water is found, and some oxidation products from hydrocarbons. Calcium Sulphate is commonly known as Gypsum.
