Engine lubrication system — general information (Mercedes-Benz S-Class W116)

In eight-cylinder engines, the oil flow is directed to an air-cooled oil cooler; the operation of the radiator is controlled by a thermostat, which directs oil to the radiator at a temperature of +110°C. The oil flow in a six-cylinder engine changes depending on the temperature. In the upper housing of the oil filter there is a thermostat, to which a valve is pressed by a spring. Depending on the oil temperature, the valve opens and closes the oil supply to the oil (see fig. 101). At oil temperatures below 95°C, the oil supply to the radiator is completely blocked. The oil flow goes directly to the lower filter housing. At temperatures above 95°C, the thermostat begins to move the valve, and at 110°C, the valve is completely open. The channel for supplying oil to the lower filter housing is completely closed, and the oil passes only through the radiator. The oil flow in the radiator moves from the bottom up. From the radiator, the oil goes to the upper filter housing.



From the upper housing, oil passes through a paper filter element in the lower housing.



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The diagram of the lubrication system of an eight-cylinder engine is shown in fig. 103.

The diagram of the lubrication system of a six-cylinder engine is shown in fig. 102. The gear pump of the lubrication system is driven by an intermediate shaft. Oil is supplied to the pump through an elastic pipe and a mesh in the oil receiver. The elastic pipe allows installation of oil pans of various designs on engines.

From the gear pump, oil under pressure is supplied to the main bearings of the crankshaft and through channels in the crankshaft to the connecting rod bearings. Part of the oil is supplied to the camshaft bearings and provides lubrication of all valve mechanism parts. The cylinder mirror, pistons and piston pins are lubricated by splashing.

There is a pressure reducing valve in the cylinder block, and in six-cylinder engines there is also one in the oil pump housing.

In six-cylinder engines, the oil filter is located on the left and in eight-cylinder engines on the right at the bottom of the cylinder block.