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PRESSURE LUBRICATION SYSTEM IN ENGINES :

In this system, lubricating oil id forced under pressure by a pump at a pressure of 2 to 4 MPa. It consists of oil sump, oil pump, oil gallery , pressure release valve, oil filter, oil pressure gauge and oil dipstick. The lubricating oil from the sump or oil pan is sucked by the oil pump and lifted to oil main gallery through oil filter and strainer. The oil pump is driven by camshaft. Oil pump and filter are always immersed in the oil.



From the oil gallery, the oil is distributed under pressure to various parts of the engine to be lubricated by the oil tubes. Oil from gallery enters the crank pin bearing through a taper hole in the crank shaft. A through hole is provided at the center of  the connecting rod. Separate oil tubes carry oil for lubricating timing gears, rocker arm assembly, cam shaft etc. Another oil line is connected to the pressure gauge to show the pressure of the oil.

The excess supplied oil drips back into the oil sump. A pressure relief valve is provided to avoid any damage in case of excess oil pressure. An oil dipstick is provided to measure the oil level in sump. 

Advantages :

* All the parts of  the engine are efficiently lubricated.
* The minute gap between the sliding surfaces can be lubricated           since the oil is supplied under pressure.

Engine parts lubricated under pressure : Crank Shaft main Bearings, cam shaft main bearings, big end bearings of the connecting rod, timing gears , chain and sprocket, rocker arm , springs , valve stems, valve guides etc. 
 




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