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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 four spark plug threads are cracked. |
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| After installing new bucket tappets the engine must not be started for approx. 30 minutes (otherwise valves will strike pistons), then turn crankshaft two rotations. |
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