Fig. 2.232. Z6 engine components: 1 – drive belt; 2 – automatic drive belt tensioner; 3 – valve tappet; 4 - timing mechanism drive chain; 5 – cylinder head gasket; 6 – front oil seal; 7 – rear oil seal; 8 – engine; 9 – control oil valve (oil control valve); 10 – actuator for changing valve timing