example of a truly busted thermostat

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example of a truly busted thermostat

Postby dudload » Tue Nov 29, 2016 5:41 pm

evening all!

after much f'ing and blinding this afternoon - i finally managed to remove the thermostat housing using a wood chisel and some gentle tapping from a hammer. when i removed the housing i was horrified (but not surprised) to find the below - as i suspected it was seized firmly open, which would explain why my heater was always lukewarm.... the thermostat itself looks very different to the 88degrees one i've replaced it with - anyone have any idea what this is.

(p.s. hello all - i normally post on mmoc, but it's down for the mo) oh and i also found the bit that had looked to have fallen off the stat in the bottom of the water sump below it
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Re: example of a truly busted thermostat

Postby Panky » Tue Nov 29, 2016 6:06 pm

Hello and welcome, maybe you'll stay ;)
Crikey, that looks like it's come off a steam engine :shock:
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Welcome,

its a very old wax stat circa 1940/50's

Alan,
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Re: example of a truly busted thermostat

Postby MickEssex » Tue Nov 29, 2016 7:36 pm

You definitely need a new one. ;) Welcome to the MMO. :D
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Re: example of a truly busted thermostat

Postby dudload » Tue Nov 29, 2016 8:40 pm

thanks for the warm welcome all!

1940s/50s! that's older than the blooming car - no wonder it was seized open :)

anyway i flushed the system in both directions (including the heater) until nice clear fluid came out and filled up with 33% bluecol. just need to get some revs up to clear the airlock in the heater (i hope!).

radiator is now behaving normally now, flushing suddenly with very hot water so chuffed with the results - but just need to get the heater bloomin warmer (the whole reason i was tackling this in the first place).
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Re: example of a truly busted thermostat

Postby Plin » Tue Nov 29, 2016 11:07 pm

:D Welcome to our friendly forum from me too!
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Re: example of a truly busted thermostat

Postby philthehill » Tue Dec 13, 2016 3:09 pm

The thermostat you have taken out is not a wax stat type thermostat but a bellows type which was filled with a type of spirit which expanded/contracted when hot / cold and so opening / closing the valve. It was supplied as original equipment under either BMC Pt: 11G292 or 11G214.
The wax type thermostat was fitted to later Minors. The bellows type is still available and is said to be the preferred thermostat by the likes of Triumph TR 2/3 & 4 drivers.
This a link to the wax stat type as supplied by MOSS.
http://www.moss-europe.co.uk/thermostat ... ts106.html
This is a link to the bellows type thermostat as supplied by MOSS.
http://www.moss-europe.co.uk/thermostat ... 07590.html
The beauty of the bellows type thermostat is that when it fails - it fails into the open position so alleviating the possibility of the engine overheating.
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Re: example of a truly busted thermostat

Postby Plin » Wed Dec 14, 2016 12:36 am

:D Welcome to the forum philthehill - thanks for sharing the thermostat links.
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I've always said that bellows thermostats are worth SHOUTING about :director: :lol:

I'll get my coat.....
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Re: example of a truly busted thermostat

Postby MM » Tue Dec 20, 2016 6:32 pm

Phew, quite a difference in price there! :shock:
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Re: example of a truly busted thermostat

Postby Mike Nash » Thu Dec 22, 2016 9:29 pm

A few days after Dudload's thermostat failure above I also had a thermostat failure. A couple of miles from home I felt a stab in the left ankle which turned out to be hot water dripping from the heater. Of course the weather was freezing cold and the steam instantly froze on the inside of the windscreen, but using the spare can of water that we all carry and with much scraping of the 'screen with a credit card, I got my Trav home. I've taken the heater out and connected the water feed and return with a hose, see below.
(The T piece in the hose is my capillary sensor for my water temperature gauge which has to go in this hose 'cos it's only 2 foot long.)

However, in subsequent use the water temperature was all over the place and often boiling, so the 89C thermostat was taken out and was put into pan of water (with 3 others while we're about it) for a test against my best thermometer. To my surprise I found that instead of opening at 89C it opened at 94-96C and then only opened to about 3 millimetres not the full 5-6 mm I'd expect. (And likewise one of the other thermostats that I'd also included.) So I fitted a 82C thermostat that had showed that it worked properly and now all's well, the temp doesn't waver unduly and sticks at an indicated 180F (i.e. 82C).

I now suspect the defective thermostat has been failing for some time when I think of some of the temperature fluctuations that I saw, but with the heater in the circuit (and in this time of the year nearly with it always on) that masked the thermostat's late opening. More troubling is that ALL my thermostats were tested before they were stored and now it seems they can fail even if they're not used. And, of course, they don't "fail safe" i.e. in the open position.

Regards, MikeN.
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Re: example of a truly busted thermostat

Postby Andy W » Fri Dec 23, 2016 10:35 am

The vast minority wrote:I've always said that bellows thermostats are worth SHOUTING about :director: :lol:

I'll get my coat.....


Allow me to hold the door for you..! :lol:
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