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907/910/912 Thermostat - Engine/Ancilliaries - The Lotus Forums Jump to content
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Roger 912

907/910/912 Thermostat

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Hope someone can help.

I am looking for a bellows thermostat either 74 or 82 degrees for one of my cars and I am trying to find out what other general cars used this same one.

I have been told Fiat Uno, Jag XJ6 and Mazda 3,4,5,6,7.

Can anyone confirm this for me.

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Thanks Travis. Yes, but I cannot believe that Lotus made any part but bought in from existing manufacturers. I have been googling this problem plenty and the number of Esprit owners who have problems with these items is amazing, most jamming open. I think that this is the problem with two of my cars, one a 910 and the other a 912 engine. I will remove the one from the Excel and take it in to a large part supplier and see what we can fabricate.to make another type fit.

Go well.

Roger

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What's wrong with just buying a Lotus one?


88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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The 82 I took out ia a "Waxstat", I replaced it with a 74 from SJ Sports cars, but I can't tell brand. (It's in the car)


Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer)

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My problem is that there is no Lotus parts available over here in South Africa. The Lotus ones are known to give trouble and one fellow on a forum has gone through 7 in his experiences with his Lotus engines, most sticking open but a couple sticking closed.

Searching the web I have had it confirmed that the thermostat QTH104 that is used in both the E Type and the XJ as well as the Mazda RX-7 is identical to the one used in the 900 series engines.

Specs are 54 mm flange, 28.5 mm diameter, 34.5 mm in height..

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Don't forget, if there is no by-pass hole, drill one, I used a 1/8th, makes bleeding the system a lot less painful.


Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer)

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The 82 I took out is a "Waxstat"...

My '89 non-SE is very original (6,212 miles when acquired in 2004) and also has a Waxstat marked 82˚C, Made in England.

It has a weep hole about 1/8" in diameter, with a little teardrop-shaped float to help it bleed air but not coolant.


"If everything is under control, you're going too slow." - Mario Andretti

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