Engine 9111 · Functional description of valve stroke

Engine 9111 Functional description of valve stroke adjustment The valve stroke adjustment system consists of switchable flat-base tappets which are actuated by means of an electrohydraulic 3/2-way valve. Since two different cam shapes are used on the camshaft, it is possible to select the different cams (by switching the flat-base tappets) so that their respective valve stroke characteristics act on the engine. These flat-base tappets are mounted on the inlet side of the engine. The flat-base tappets consist of two nested tappets which can be interlocked hydraulically by means of a pin. Once interlocked, the inner tappet comes into contact with the small cam and the outer tappet with the large cam. An element for compensating the valve clearance is always integrated in the power flow of the tappet. 1_01_00 1 - 12 Service Information 2002