Offshoreonly.com - cooling mess!

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Joey Jr

03-25-2006 08:26 PM

cooling mess!

I'm having a problem with a merc 496. After an impeller change I could only get one side of the exhaust to flow water. I back flushed the whole system piece by piece. I'm tinking its the check valves on the manifolds. Any information would be great.

mr mercruiser

03-25-2006 08:49 PM

Re: cooling mess!

there is a ckeckvalve on the inlet side of both manifolds-take them apart and I am pretty sure you will find some salt build up in that area-

Joey Jr

03-25-2006 08:55 PM

Re: cooling mess!

thats what i thought. Do they just pop apart or are they threaded? The 496 is still new to me.

Joey Jr

03-25-2006 08:57 PM

Re: cooling mess!

the boat ran aground too.

Joey Jr

03-25-2006 09:00 PM

Re: cooling mess!

I hooked the hose directly to the manifold and it stayed cool. The heat exchanger is clear. I just don't understand the whole raw water system.

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