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| Cylinder heads which have cracks between the valve seats or between a valve seat insert 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 thread are cracked. |
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| Cylinder head and retaining frame may be renewed together only. |
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| Wait about 30 minutes after installing the camshafts before starting the engine. Hydraulic compensation elements must settle (otherwise valves will strike 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 renew gaskets and seals. |
| Removing and installing camshaft adjuster → Chapter |
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