With only a limited time before the rain started again I went with the more important job of sorting the leaking oil cooler. I'd already bought a new gasket and a blank plate if the issue couldn't be resolved.
I drained the oil and removed the filter to allow better access. Thankfully it was just a loose AN10 fitting on the adaptor, I tightened everything up and refilled with oil and a new filter. In the summer I'm planning on pulling the front subframe and tidying it up as it's a bit rusty.
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Also a little bonus, I was initially unsure on whether running an oil cooler was necessary with the UK climate but while following the cooler pipework I found one of these.
https://www.improvedracing.com/high...5J-3H-f1rp3jX4GzWd1fSiU34p_C5dfsL8MVjxzbj232O
Excuse the horrendous picture.
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Once I'd refilled the oil I tested the thermostat to make sure it's still opening and closing at the correct temperature. At least that relieves a bit of a worry of the oil being over cooled.
Also, yeah it needs a wash.
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I was hoping to fit the oil temperature sensor and gauge, but the adaptor block with the 1/8npt fitting is American and I don't have an Allen key in 9/64"? I don't know it's not 4mm it's not 5mm and not even 4.5mm although it did fit better didn't want to risk damaging it.