Exam Question

### (a) Difference between Cylinder Lubrication and Crankcase Lubrication Systems
A marine slow-speed, two-stroke, crosshead-type diesel engine utilizes two entirely separate and distinct lubricating oil systems: one for the cylinders and one for the crankcase.
**1. Cylinder Lubrication System:**
* **Concept:** This is a 'total loss', 'once-through' system designed specifically to lubricate the interface between the piston rings and the cylinder liner. Its primary functions are to minimize friction and wear, create a seal between the rings and liner to prevent blow-by, and, most critically, to neutralize the corrosive sulfuric acid formed from the combustion of sulfur-containing heavy fuel oil.