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Merc 90 i6 help

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pyro225:
Hi I have good compression on all cylinder but water in c3 plug - have been researching and water jacket comes up - anyone show me what that is that I need?

Thanks!


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Hyperacme:
 Corrosion from salt water ?

Plugcheck:
We had a similiar issue with a 115 tower of power, water came out around spark plug.  The gasket had failed.  Bad news was the water had made it's way into the cylinder and corroded the cylinder.   If you can't tear it down soon, pull the plugs and get the cylinder oiled to prevent further damage.

pyro225:
Hi all - it was in salt water prior to my ownership but was flushed every use and had low hours... planning a tear down soon but was just going to do all the gaskets and water jacket but didn’t know if you can identify it being bad?


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pyro225:
Also if the cylinder is corroded what can you do?


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