The structure and operating principle of the lubrication system (Mercedes-Benz S-Class W126)

The toothed oil pump with its intake pipe reaches the deepest point of the lower half of the oil pan. An elastic adapter is fixed on the intake pipe of the pump, which rests on the bottom of the oil pan. It ensures the same and constant cross-section of the intake pipe on all engines, regardless of the manufacturer's tolerances. The oil pump is driven by a chain through an intermediate sprocket, an intermediate sprocket shaft and a pair of gears (6-cylinder engines). In 8-cylinder engines, the oil pump is driven by the crankshaft sprocket through a simple, uniform chain of 48 links. The oil cooler line is regulated depending on the temperature. At the top or bottom of the oil filter is a thermostat, which acts as a control disk, counteracting a spring. Depending on the oil temperature, the control disk opens or closes the oil channel to the oil cooler or to the bottom of the oil filter.

The oil pressure gauge is electrically controlled by a pressure sensor, the pressure sensor is screwed into the upper part of the oil filter or into the lower part on 8-cylinder engines. At operating temperature, the oil pressure should decrease by 0.5 bar at idle. When the "gas" is applied, the pressure should increase again and reach at least 3 bar at 3,000 rpm. The oil pressure reducing valve is built into the pump cover. On 6-cylinder engines, another oil pressure reducing valve (5 bar) is installed in the front oil channel of the front wall.

Oil line with oil cooler for 280 engines (280S and 280SE)

Oil line of 8-cylinder engines

(Original can be found on the website: www.mercedesman.ru)