SLK 230 (170.447) L4-2.3L SC (111.973) (2000)
Operation Of Electromagnetic Actuator Of Camshaft Adjuster
The control piston (18) directs, depending on its position, the pressurized engine oil from the camshaft flange (22) into one of the two working
chambers (A or B) and at the same time opens the oil return flow for the respective pressureless working chamber (A or B).
Moving Camshaft Adjuster Into "Retarded" Position
Actuator (Y49) is deenergized and as a result the control piston (18) is moved back as far as the stop ring (19) by the force of the compression
spring (17) and allows engine oil to flow into the working chamber (A) and at the same time allows oil to flow back along the oil return for the
working chamber (B).
The torque of the inlet camshaft sprocket (13) which is acting in the direction of rotation of the camshaft, pushes the adjusting piston (14) forward
as a result of the screw effect of the helical gearing. The working chamber (B) is emptied through the drillings (14c) in the adjusting pistons (14),
(16a) in the flange shafts (16), (18a) in the control piston (18) and two drillings (23) in the camshaft flange. The engine oil pressure which exists in
the working chamber (A) additionally maintains the control piston (I) in the "retarded" position.