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| Cylinder heads with cracks between the valve seats or between a valve seat ring and the spark plug thread may continue to be used without any reduction in life provided these are slight initial cracks which are not more than 0.3 mm wide, or cracks exist only at the first 4 turns of the spark plug thread. |
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| After installing new bucket tappets or hydraulic supporting elements, the engine must not be started for about 30 minutes (otherwise the valves would strike the pistons). |
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| After carrying out work on the valve gear, carefully crank engine at least 2 revolutions to ensure that no valve touches the piston when the engine is started. |
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