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| Engines with engine codes CCSA, CMXA: inlet and exhaust valves, valve seats made of wear-resistant material. |
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| Cylinder heads which have cracks between the valve seats or between valve seat inserts and the spark plug thread can be used further without reducing service life, provided the cracks do not exceed a maximum of 0.3 mm in width, or when no more than the first 4 turns of the spark plug threads are cracked. |
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| After fitting the camshafts, the engine must not be started for at least 30 minutes. The hydraulic valve compensation elements have to settle (otherwise valves will rest on pistons). |
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| After working on the valve gear, turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is operated. |
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| Always replace gaskets and oil seals. |
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| Valve gear - Components overview → Chapter. |
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| Camshafts: Removing and installing → Chapter |
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| Support elements with hydraulic compensation: verification → Chapter |
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