I had an older model Sea Ray. Loved it until I had to turn it over to my ex along with the house, etc etc etc.

Ahh yes. California.

Oh, sorry. Back to your question...I too had the Chevy engine with Mercruiser outdrive.
The engine is cooled by lakewater drawn in through the outdrive through a heat exchanger and back out to the lake. With this design, lake water never enters the internal passage ways of the engine. The engine has a closed system thus is protected from contaminants. IE mud,sand,fish, etc.

Your problem may be the impellar that draws the lake water to the exchanger.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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