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post #7 of (permalink) Old 1st September 2007
Technical Supremo

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Many large marine engines have cylinder heads but don't require removal to do the valves or seats. The valve sits within a tube containg the springs, seat, etc.) which is inserted into the cylinder head and retained by bolts and can be removed when necessary or a suitable replacement exhange unit fitted in a matter of minutes. As these engines are slow running it can actually be done without stopping the engine - this idea stems from the days of steam.
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