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

[Mark Lewis]

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:
>
>> 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:
>>
>>> Thanks for your advice
>>>
>>> Sent from my iPhone
>>>
>>> On Aug 4, 2015, at 3:18 PM, Max soto <maxsoto at gmail.com> wrote:
>>>
>>> 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:
>>>
>>> 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:
>>>
>>>>
>>>> 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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