[C320-list] Coolant mixing with raw water

[Marianne and Kevin Waterbury]

Thanks for all the replies I have tried testing the heat exchanger for leaks by placing it in a barrel of water and blowing air through it with a compressor , not very professional, but it looked like there were no leaks. I’ll bring it to a radiator shop to see if they can test it . I have also filled the radiator up to a level just under the heat exchanger I will check to see if coolant level has gone down which may indicate a leak some where else.
Thanks again
Kevin Waterbury
Harvest Moon  hull #111

> On Jun 27, 2019, at 9:11 AM, Dave Hupe <hoopdtwo at yahoo.com> wrote:
> 
> I think if it was a blown head gasket, you would quickly know it by examining your oil color/level.  However, it sounds like you believe the oil is fine.  That seems to strongly suggest that your problem is either the heat exchanger tube or the tank itself being cracked.  If the tube is cracked, coolant might seep in and be ejected along with the seawater through the exhaust.  Similarly, if the tank is cracked, it is possible coolant also can become part of the exhaust and be directed through the exhaust elbow.
> I replaced my Perkins Perama M30 heat exchanger tank, reused the exchanger tube (had it cleaned/tested) and exhaust elbow, and replaced the end rubber caps this past Spring due to a cracked coolant filler neck on my tank. I have a detailed replacement procedure written with photos that I've submitted to the association for possible publication.  I can send it directly if desired. I purchased all of the parts from here in the United Kingdom  https://www.parts4engines.com/perkins-perama-m30-parts/ . Prices and shipping are very good and fast.  I have used them multiple times (also for an engine water pump previously) with perfect success and can't recommend them more highly. 
> Dave Hupe
> 1994 Cat320 (#32) "Mayan Sun"
> Holland, MI
>  
> 
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