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Leakage Test / Test Pression / Lektest

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It is sometimes a good idea to have a leakage test done first on an older cylinder head or one that has suffered extreme use, before having any work done on it.

Fine cracks may be discovered which will definitly leak, causing the oil to mix with water. In this case, it would be better to buy a new cylinder head or to look for a good secondhand one, and then have any necessary work done on it.

In some cases, if the cracks on an aluminium cylinder head are easily accessible, they can be welded and planed. It's just a matter of finding the best solution for any problem.