The actuator valve timing change-coc toit of the housing combined with the camshaft sprocket, the cover of the rotor combined with the cam and pin, which determines the relative position of the rotor and the housing when the engine is stopped. Furthermore, the rotor includes a seal that isolates compartment and compartment retardation timing of opening or closing the valves. The cover and the rotor actuator variable valve timing have grooves, which are used for the correct alignment when viewed from the actuator variable valve timing
(Fig. 2.36).