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JustBadly

Thermostat conversion

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Getting everything together to start the conversion. I'm placing the thermostat valve at the top (entry) of the radiator, currently as many owners of the 2.5 & 3.0 know - the valve is at the bottom left (exit) of the radiator. All the pipes look way too big but they will be trimmed quite some way. The important thing is all the internal diameters are right. Just got to order a 90° pipe @ 38mm and several pipe clips. Easy really.

IMG_20201017_132654.jpg

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Is the conversion a common thing among S type owners? Presumably to make the system easier to bleed?

Are the details posted somewhere?

Sorry am new to the world of S types and haven't found an obvious answer with some googling!

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Ha Ha, no what problem petrol S & X types have (excluding V8 & diesel) is overheating. It makes itself known by a water 'leak' due to over pressure, pinking on acceleration and general god awful running. The thermostat is placed 'after' the radiator and since that is rated at 87°C, the coolant post radiator is not hot enough to open it. Result no water flow, overheating cylinder heads, blown head gasket, etc. I've built up a few race engines and every time we find the thermostat post radiator it gets changed because it runs the engine too hot. No difference here so I've got a few more parts to arrive but it will all make sense once I've got this fitted. Jaguar have got a sprung blow-off valve on the thermostat housing and if the engine over revs while cold it will open and divert the excess pressure thru the radiator. Fingers crossed it will all go together nicely. Good luck finding anything about it on the net.

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