Description and maintenance of the crankcase ventilation system (Mercedes-Benz E-Class W123)

The closed crankcase ventilation system sucks out gases that have broken through from the cylinders into the crankcase for subsequent combustion in the combustion chambers together with the fuel-air mixture. On M 123 engines, the system has a separator, and on M 110 engines, circulation is enhanced by a ventilation valve or nozzle.

Maintenance does not include any special operations except periodic checks of the system's condition and reliability.

Crankcase ventilation system of the M110 engine with fuel injection and electronic ignition