supercharger tensioner and no noise!
Turbo Mini Forums

I recon your tensioner setup is bent!

Graham

see i was thinking this earlier on i have removed the the tensioner bracket and it looked like it was cracked (on the weld)

so i have now removed all of the paint to discover it is made from a flat piece of metal 2 thick exhaust manifold washers and a nut! all welded together,

also the bolt i was given for the tensioner doesnt fit the hole it is far to small, so now i will have to get a metal sleve or another tensioner which i am looking for now

Glad you've got it sorted!

Graham

going to have to get a new tensioner i got a sleve today and the tensioner still wobles it must be the bearings inside.....

is there a specific name to the type of tensioner or just a non flex tensioner as i have ok? will probly be getting the cossi one if things persiste

Cossie one works really well, I'm very please with this setup. You'll have to machine a spigot for it, but its nothing special..

Graham

bit of a noobish question but what is a spigot

something a "jockey" wheel goes on?

really and how would i go about putting one on (my tensioner bracket)

Basically it’s a bolt that goes through the jockey wheel. It will need to be an interference fit so a little machining will be required

Graham

I wouldnt have thought it would be an interference fit, how would you tighten it properly? The bolt is a clearance fit. An interference fit means that the two parts interfere with each other as one part is usually larger than the other part it fits into.

How wide is the 5K belt? The VW tensioner is narrower than the Ford one, I don't know by how much but I know the timing belts are 18mm wide and the tensioner is usually a little bit wider

The 'interference’ fit is only 5 thou or so (I’m not a machinist by trade), so the spigot had to be pushed though with a little force. What I didn’t want happening was the centre moving indicated by the red arrow. In my opinion the width of the jockey wheel isn’t crucial as long as all the pulleys line up properly. I paid a lot of attention in this area, after aprox 2500 miles there hasn’t been a problem. The belt I used wasn’t brand new either, it had done 15000 miles in a BMW mini.

Graham

could you possibly do a step by step ?

The Cossie tensioner should not be an interference fit on the bolt, it should have a (very small) clearance.

The adjustment is by rotating the centre boss around the bolt while it is slackened off - there is a hexagon on the centre piece on the opposite side of the photo to hold it with and rotate it to achieve the required tension - and then tightening the bolt without the centre bit moving. The ground face of the centre bit (as seen in the photo) then grips against a machined face on the engine block - or bracket in your cases - to hold it at the correct tension.

Hope that makes sense.....

Schrödinger's cat - so which one am I ???

The reason why I made the spigot an interference fit is I didn't want the center boss to move at all. By swinging the bracket in an ark this would then tension the belt.

Graham