One of the most expensive problems damage to your engine (s) is cavitation damage ! But small cracks may already lead to such damage that needs to be replaced throughout cylinder . Slowly but surely , the sealing edges and adjacent surfaces / holes of the exhaust valve seats eaten away by the cooling water. It is generally difficult to trace , let alone to repair the damage , for example, an oversized valve seat. Unfortunately, there is also the option that expires completely if the cavitation investigations reveal too serious!
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CF Techniek