[C38] How do I tell if my heat exhanger is not working?

[1derful at comcast.net]

I'll try it. 
Thanks 
Patrick 

----- Original Message -----

From: "Mark Lewis" <mwlewis2025 at gmail.com> 
To: "Catalina" <listserve at catalina38.org> 
Sent: Thursday, August 6, 2015 12:28:49 PM 
Subject: Re: [C38] How do I tell if my heat exhanger is not working? 



Well, if the welds or the tubes inside the exchanger were cracked it could allow fresh water to mix with sea water and be pumped overboard. Sea water is used to cool the fresh water that runs through tubes inside the heat exchanger, and then the sea water is pumped overboard along with the exhaust via a thru hull at the stern. I'd remove the exchanger and clean and inspect it. It's not that difficult to remove. There are also gaskets on the ends of the exchanger that could leak. I had a westerbeke 33 that had a pencil zinc in the exchanger. They would corrode and fall off inside and block the tubes. 
On Aug 6, 2015 3:15 PM, < 1derful at comcast.net > wrote: 



oil looks clear. 
water is clear 
I flushed cooling system and rusty water came out. 
so water can't leak out of a defective heat changer? Right? 


From: "Mark Lewis" < mwlewis2025 at gmail.com > 
To: "Catalina" < listserve at catalina38.org > 
Sent: Thursday, August 6, 2015 11:55:55 AM 
Subject: Re: [C38] How do I tell if my heat exhanger is not working? 



No. Water loss would mean a gasket or hose leak, or a cracked block or head (not likely). Are the oil and water pure (ie not mixing with each other)? They are tough engines, look for leaks. 
On Aug 5, 2015 2:09 PM, < 1derful at comcast.net > wrote: 

<blockquote>

Thanks for your reply. 
If the heat exchanger is dirty will that cause water loss? 



From: "Mark Lewis" < mwlewis2025 at gmail.com > 
To: "Catalina" < listserve at catalina38.org > 
Sent: Wednesday, August 5, 2015 10:35:34 AM 
Subject: Re: [C38] How do I tell if my heat exhanger is not working? 



Another suggestion is to remove the exchange r and clean it. The tubes collect calcification and a wire pipe cleaner can clean it. 
On Aug 5, 2015 10:51 AM, "Patrick" < 1derful at comcast.net > wrote: 

<blockquote>

Thanks for your advice 

Sent from my iPhone 

On Aug 4, 2015, at 3:18 PM, Max soto < maxsoto at gmail.com > wrote: 


<blockquote>

I used my 5424 without a thermostat and a 3" heat exchanger for 12 years and had no problems.. 

Patrick, check on eBay for the heat exchanger... You might find a bargain! 

Regards, 

Max Soto A. 
+506-8312-1367 
Alajuela, Costa Rica 

On Aug 3, 2015, at 08:47, Mark Lewis < mwlewis2025 at gmail.com > wrote: 


<blockquote>



Patrick, I read somewhere that the cooling system doesn't work with out the thermostat installed. I was going to leave it out to make the engine run cooler, but had to put a new one in. 
On Aug 1, 2015 11:29 PM, < 1derful at comcast.net > wrote: 

<blockquote>


Hello, 
My Catalina has been overheating. Universal Diesel 5424. 
I removed the thermostat........it was corroded and wrapped with debris. 
I removed and cleaned the internal water pump. Also lot of debris. 
Put hose in engine. Water didn't flow but eventually it did. More debris. 
now when I run the engine it is cool until I put on the radiator cap..........then it gets too hot and loses water. 
Any thoughts? 
Patrick 

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