Right then, I did the waterpump gaskets today.
The O-rings were crumbling and covered in crystalised coolant.
I started it up and it squealed it's head off straight away, I thought ah well let's just see if it leaks then. I forgot to dry the water off the waterpump so I doused it in brake cleaner and and the squealing disappeared! I then washed the coolant from around the header tank and some went on the waterpump which made it squeal. I brake cleanered it down again and it went quiet.
I had a fiddle with the power steering belt tensioner and I have managed to get it sitting much nicer and tensioned correctly.
So the answer to the squeak is a waterpump pulley that doesn't like being wet at all!
I did forget to put the top timing belt cover on before the waterpump pulley so it has to come off again to fit it!
While I was there I fitted the new rotor arm and cap too.
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