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That you observed no movement of the mechanism condemns the unit, yes.
I'm not sure if it's open or closed. A view from the top, through the opening where your string is attached, would be better.
I am wondering of it is physically broken. I *think* the parts have separated. See the section with the squared-off notches? I think the piece directly below those notches should be attached to it. Not sure. But, in any case, the thermostat needs replacing. I replace both. Get the correct ones. Some are not correct for a V12 even though the catalogs say otherwise. Several threads on the subject
It is not so much how large the opening is, as the water is forced through it by the ater pump. More so that the rear disc covers the bypass hole inside the thermostat housing. If it does NOT block off the rear opening, then your cooling system isn't functioning correctly. Meaning the some of the hot water gets circulated around the engine again and again instead of it ALL going through the radiator.
It is not so much how large the opening is, as the water is forced through it by the ater pump.
I have to disagree.
Let's say the thermostat opens 50% and remains stuck in that position. You'd then have a smaller opening for the coolant to travel thru and less coolant reaching the radiator, despite the water pump's effort at pushing the coolant through the system. The engine might overheat.
More so that the rear disc covers the bypass hole inside the thermostat housing. If it does NOT block off the rear opening, then your cooling system isn't functioning correctly. Meaning the some of the hot water gets circulated around the engine again and again instead of it ALL going through the radiator.
In case somebody is interested, here is how insides of t-stat housing look like. (I put the camera right against the opening)
By the way, what do people normally use as a sealant when installing a new gasket? I have a sealant for oil gaskets. Will it work for t-stat gasket, too? Or because t-stat comes in contact with coolant an not oil, a different type of sealant is needed?
I just the later black Jaguar gaskets. Steel core with a coating of something on them. Work really well and don't need retorquing. Kind of like mini Cometic headgaskets.
I just the later black Jaguar gaskets. Steel core with a coating of something on them. Work really well and don't need retorquing. Kind of like mini Cometic headgaskets.
Sorry, What kind of "coating of something" you applied? Does it matter? Or it can be any sealant? (Including oil gasket sealant?)
Sorry, What kind of "coating of something" you applied? Does it matter? Or it can be any sealant? (Including oil gasket sealant?)
The coating was on the steel core of the gasket. Factory applied to make a complete gasket. You don't have to do anything, just use them right out of the bag.
So that small amount of coolant can sip through and go to radiator even when engine is cold? Bu't why does it matter? Or, put differently, what could go wrong if there is no hole?
If ya dont get the air out of a V12 and allow a passage for it at all times, it WILL overheat, and ruin your bank balance.
That hole, jiggle pun, whatever at 12 o'clock is coz air is at the top of any area, usually, and it will simply slide thru that hole, out via the not so simple air bleed system, and allow proper operation of the stat. Air behind the stat, in enough volume, will prevent the stat from opening, as it only works in liguid.
Also, air pockets that become steam pockets, are very destructive. The V12 does get these pockets around #5 & 6 cylinders on both sides if bleeding is not done properly, and the air bleed system is not maintained.