As > built configurations ENGINES 471.9 1 Cylinder head cover 2 Prefilter 3 Elastomer element 4 Elastomer seal x Direction of travel W01.20 > 1046 > 76 The cylinder head cover (1) consists of plastic and, on the one hand, prevents ingress of water and foreign objects into the valve assembly. On the other hand it seals the camshaft case to the outside using an elastomer seal (4) and prevents escape of the engine oil used to lubricate the valve assembly. A prefilter (2) is integrated in the cylinder head cover (1).
The prefilter (2) ensures that the engine oil which is swirled by the valve assembly and mixes with the blow > by gases is roughly separated before the blow > by gases are passed on to the oil separator for the crankcase ventilation system. For acoustic decoupling of the cylinder head cover (1) an elastomer element (3) is inserted in all through holes which serve to attach the cylinder head cover (1) to the camshaft case. The elastomer elements (3) reduce noise emissions and possible damage which can occur due to vibrations. 12 – This printout will not be recorded by the update service. Status: 09 / 2011 – GF01.20>W>0801H Cylinder head cover, as>built configuration 1.7.11