[C320-list] Thermostat for Perkins M-30: VERY hot fresh water at sink

[ART HARDEN]

Totally agree!

Sent from my iPhone
Art Harden
Catalina 320 "Tortuga" E-62
937.885.9380 (o)
937.477.5544 (m)

> On Apr 10, 2024, at 10:44 AM, Christian via C320-list <c320-list at lists.catalina320.com> wrote:
> 
> Lou,
> I have a M30, and when at full load for about 30 mins, I peak at 182.  I
> would be getting nervous with it edging over 200.  I suspect you have a
> cooling issue somewhere, and yes I do think your very hot water at the
> galley sink is related, as the engine heats your water too in the hot water
> tank in addition to electrical heat.  I have also replaced my coolant
> thermostat, and my high heat thermostat, and can look up part numbers if
> you need assistance (but might take me about 24 hours).  Though I don't
> think the high heat thermostat is your issue.
> 
> Things I would suspect in high heat are:
> -check cooling system for any impeller fins or other debris
> -are the tubes in your heat exchanger corroded or blocked?
> -is your exhaust elbow clogged?
> -Have you drained your coolant and introduced an air bubble in the system?
> 
> I would start there with those questions.  You could have an issue with
> your coolant thermostat not opening, but this is not likely.  The main
> failure reason of a toasted coolant thermostat is overheating the engine
> and melting the wax in the thermostat (don't ask me how I know).  The good
> news is it's easy to test the functionality of the thermostat, you put it
> in a pot of boiling water and see if it opens.  The bad news is on the M30,
> the coolant thermostat is behind your coolant pump, and a real headache to
> get to (pump has to be removed, gaskets scraped, gaskets replaced, likely
> seized bolts, etc).  Again, it's unlikely your coolant thermostat is your
> issue, and I wouldn't focus on that yet.  Failure of that part is likely a
> symptom of something else causing cooling issues on your engine, and
> ultimately overheating the engine to the point of melting the wax in the
> thermostat.
> 
> -Christian 1994 C320 "Canuck" #138 Monroe Harbor, Chicago, IL
> 
>> On Wed, Apr 10, 2024 at 8:57 AM Louis Spitz via C320-list <
>> c320-list at lists.catalina320.com> wrote:
>> 
>> Hi folks,
>> Any thoughts on VERY hot water at galley sink, and replacing the
>> Thermostat on a 1995 Perkins M-30? Could they be related? The engine runs
>> HOT (c.205).
>> Thanks, Lou Spitz
>> Merry Chase
>> #195, 1995