Define198

each pulley requires 2x NSK 6300DU

https://www.bearingsrus.co.uk/6300du...e-ball-bearing

johnckeen

thanks dude.
Wonder if there are any high temp versions that can take heat.

johnckeen

State of my bearings :s

Define198

Mine looked pretty much exactly the same as that on both sides of the pulley and had done for quite some time. If it is the bearing that is throwing the belt then their was no real warning sign, had the car out previous weekend and was perfect, took it out weekend after and had the issue on first pull

johnckeen

weird, mines been solid, it just came back from silverstone all be it overheated slightly due to hot day but yeh belts always been solid.
One thing you do have to do though is wait for the belt to warm up before you rev it up otherwise it will slip.

Define198

Well the bearings have turned up, and they are wrong. They are sealed one side, open the other. Apparently NSK decided to change them at some point, so they used to be known as 6300DU NSK (as written on the bearing) now they are known as 6300DDU. The extra D meaning double sealed.

So remember the above for anyone else ordering replacement bearings!

These are the correct ones 2x NSK 6300DDU

https://www.bearingsrus.co.uk/6300dd...ing-10x35x11mm

johnckeen

thanks for the heads up, good job I didn't order them yesterday!

Define198

I have used them anyway, Just took a seal off one of my old bearings and put them on. Will try it on the car tonight but the pulley spins and feels so much nicer so they were 100% shot. Hopefully sorts the problem of the belt being thrown.

If this works i will most likely order some higher quality bearings that will hopefully deal with the heat better. I know the pulley gets crazy hot to touch after being driven

https://www.bearing-king.co.uk/produ...=10&D=35&bt=11

that link shows all available bearings for the bearing size in the pulley

johnckeen

thanks for that link.
They do a high temp grease one which may perform better over long time.
https://www.bearing-king.co.uk/beari...x35x11mm/17949

markforrester99

John i bet most of the debris you can see on the pulley is belt dust. I have the same dust on my pulleys. Its to be expected with the strain the belt is under when the supercharger is making boost.