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Closed cooling coolant leak

PartsManPartsMan Member Posts: 246 ✭✭✭
in Generator Discussions
2003 Mercruiser 350 Bravo III cooled cooling system

I've been losing coolant and discovered by pressure testing the system it's coming out the lower drive. Not the exhaust but the two small holes on the sides of the drive. Any ideas of where the leak is? Heat Exchanger? Risers? 


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    rasburyrasbury Member Posts: 8,237 ✭✭✭✭✭
    edited May 2016
    Wow, virgin territory for me, do you have a manual to see the cooling flow? Did not know any coolant went through the outdrive....perhaps super man Al will chime in @Alswagg I'm curious!
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    Black_DiamondBlack_Diamond Member Posts: 5,439 ✭✭✭✭✭
    Has to be leaking out thru the exhaust. That is the only route there. Could be many places to leak, I would start with the risers. A compression test will tell you if it is a head gasket too. 

    Past owner of a 2003 342FV
    PC BYC, Holland, MI
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    PartsManPartsMan Member Posts: 246 ✭✭✭
    I popped the end cap on the Heat Exchanger and it had antifreeze in it. Found my problem. Ordered a new Heat Exhanger should have it Tuesday in time for a Thursday launch
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