The perrential overheating topic

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Stu Jackson

Stu Jackson

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Feb 26, 2004
23,349
Catalina 34 224 Maple Bay, BC, Canada
Back again

Some ideas, most of which you've probably tried already: http://c34.org/bbs/index.php/topic,3779.0.html
 
M

MoonSailer

Thanks Stu!!!!

I am pretty sure that my diesel is not overheating ..that it is the temperature sensor. I had not thought of checking for corrosion on the wiring and terminals. That sure is less expensive than a new sensor.!!! It has gradually gotten worse and that would make sense with gradually increasing corrosion. I have noticed corrosion on many (most) electrical connections that I have looked at. Usually not a problem if there is not too much. But when you are measuring small changes in resistence!!!!
 
J

jviss

Who are you asking? :)

I did my own upgrade a few years back; cut the original piece of junk off (which was partially melted) and put in a marine-grade, terminal block, marine ring terminals on every connection, and marine-grade wire (all Ancor products, I think). Installed a glow plug solenoid. Huge improvement.

I would have suspected a bad gauge, except for the steam. :)
 
jviss

jviss

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Feb 5, 2004
7,090
Tartan 3800 20 Westport, MA
More...

So, I've been searching my memory for how things are set up, and it occurs to me that not all M25's in C36's are plumbed the same. When I got mine, it was in what I think was original condition: the water heater was plumed into the thermostat bypass loop, and there was a bypass valve across the water heater loop.

The domestic water took forever to get hot.

I changed it several years ago, plumbing the water heater into the thermostat housing to exhaust manifold jacket loop, with a bypass (shunt) valve. (I think - I'll have to look at it again). This has seemed to work well for years, and the domestic water heats up much more quickly.

So, I have to ask - how is yours plumbed?
 
Stu Jackson

Stu Jackson

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Feb 26, 2004
23,349
Catalina 34 224 Maple Bay, BC, Canada
For some bizarre reason the C36s had that stupid

bypass valve, discussed for eons and removed by smart C36 owners, as discussed on their website and Message Board many times.

Our doemstic hot water heater is plumbed from the top of the frshwater pump to the heater and back to under the thermostat. Simple, it works, needs NO valves.

BTW, ALL our C34s are like that. I still have no clue why they did that on your boats, although Tom Soko and Tom Senator will know for sure.
 
jviss

jviss

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Feb 5, 2004
7,090
Tartan 3800 20 Westport, MA
Hmmm...

Stu, I think what you describe is the thermostat bypass loop - relatively small hose barbs on the top pf the pump, and the side of the thermostat housing?
 
Stu Jackson

Stu Jackson

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Feb 26, 2004
23,349
Catalina 34 224 Maple Bay, BC, Canada
Here's a picture

Ignore the hand pump on the top of the engine. The two black hoses going to the starboard side and then down run under the galley sole to our heater under the galley sink. Two hoses, no valve.
 
jviss

jviss

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Feb 5, 2004
7,090
Tartan 3800 20 Westport, MA
that's it

Thanks Stu, yes, that's the thermostat bypass loop.
 
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