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The oil control rings or scrapper rings are used in the trunk type of diesel engines so that excessive lubricating oil which is splashed on the liner walls should be removed and drained back into the crankcase. This piston rings are with sharp edge pointing downwards which functions are: 1) allow proper lubrication of cylinder and compression rings; 2) reduce the amount of lubrication oil burnt in the combustion chamber; 3) scrap the excess oil from the liner on the down stroke. Their edges scrap down the excess oil splashed onto the liner so as to prevent the excess lubricating oil consumption and burning of the excess lubricating oil along in the combustion process. Hence excess cylinder lubrication oil is scrapped and the amount of lubrication oil burnt in the combustion chamber reduced. In case the oil control rings are fitted wrongly, the lubrication oil consumption will increase and the turbocharger and the exhaust manifold will get fouled because the excess oil is not scrapped, it will get burnt in combustion space resulting in turbocharger and exhaust passage fouling and piston ring getting seized in the grooves due to excess carbon formation.

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