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There is water in my oil i dont no what to check first i have a 3.0 mercriuser inboard/outboad i put in water temp started riseing so i shut off someone told me my water impeller in leg wasnt working so i checked and its true . well now i have water in my oil and was wondering how it got in there if there was no water coming up the leg to the engine. the oil was clean when i put it in

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You will need to do 2 things first, A compression test to check the it hasn't blown a head gasket.
Then a pressure test on the cooling system (BUT) leave the spark plugs out when you are doing this.
If you have trouble holding pressure in the cooling system , stand by and keep pumping and wait to see water coming up out of a plug hole.
Hope it turns out well for you. Good Luck

Posted on Aug 26, 2010

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check water for signs of oil this would look lik mayonaise floating on top in the water filler bottle.

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When it gets to temp and cuts off remove the water filler cap and then try starting if it starts then this is head gasket failure

If none of those show up then i would go with the oxygen sensor replacement.

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