- Engine Oil sticks to the surface of Engine Components and prevent surface to surface contact between them .
- Engine Oil helps in removal of heat generated due to friction between rhe components.
- The Engine Lubrication System Circulates the Engine Oil across the whole engine, hence it helps in cleaning of all the components.
Types Of Engine Lubrication Systems
Mist Lubrication System
Mist lubrication system was used for lubrication in 2-Stroke Engine. In this system of lubrication, the Engine Oil was mixed with the fuel and supplied to the Engine. This mixture was converted in to fine vapors in the Carburetor. This fine mixture of Fuel and Lubricant forms mist. This mist helps in Lubricating the components inside the Engine. This system is very simple and do not require components such as lubricating pump, Lube Oil Filter or Oil sump. However, one major disadvantage of this system is burning of Engine Oil along with the fuel. This causes a lot of pollution and also reduces the efficiency of the engine.
Pressure Feed Lubrication System
Pressure Feed Lubrication System is used in most of the modern Engines. This system consists of an Oil storage sump or tank from which pressurised Engine Oil is supplied to all the Engine components. This system keeps the fuel and Lubricant separated from each other, increasing the efficiency of engine. Pressure Feed Lubrication System provides better lubrication since it do not suffer with the problem of mixing of Engine Oil and fuel. This system consists of separate galleries for supplying Engine Oil to different components of Engine. These galleries are located all around the Engine forming a closed flow circuit. This Lubrication System consists of an Oil storage tank called sump. From sump, the Engine Oil is pumped out using a pump. It is then supplied to the Oil filter to separate out the dirt and debris from it. These dirt and debris may damage the Engine components and may lead to their malfunction. After getting filtered, the Engine Oil travels through the Oil galleries to Cylinder Head, Crankshaft Bearings, Cylinder Walls etc. The Crankshaft Bearings are Plane Bearings having no rolling balls. These bearing require a thin film of Engine Oil to be present around their shaft surface, for proper functioning and Lubrication. This Oil is supplied through the Oil galleries. After lubricating the Crankshaft Bearings, the Engine Oil travels along the Crankshaft to the big end of Connecting Rods through oil galleries inside the Crankshaft. Here, it lubricates the big end of Connecting Rod and further travels along the Oil galleries in Connecting Rods to the Gudgeon Pin. Some of the Engine Oil leaks at the joints of the Connecting Rods and the Crankshaft. From here, it is thrown towards the Cylinder Walls due to reciprocating motion of the Piston. This helps in Lubricating the Cylinder Walls. The excess Oil from Cylinder Walls is scrapped using the Oil Ring on the Piston, which falls in to the Oil Sump. One branch of galleries from the Oil Pump takes the Oil to the Cylinder Head, where it lubricates the Camshaft and Rocker Arms. From here, the Oil moves to the Oil sump.
- Wet Sump Lubrication System
- Dry Sump Lubrication System