I didn't tighten it. It was done in a garage about three weeks ago !! Rebuilt with a BRAND new crank and a new stretch bolt. I was travelling along a motorway this morning at about 60 mph when I heard something hit the bottom of my van , I thought I had run over something, I looked in the mirror and saw the bottom pulley careering up the banking !! By this time the engine had obviously stopped, when I pulled up I checked and every belt had disappeared .really, i would have put gremlins first?
what did you toghten it to?
I've not got much chance of that. It would be like searching for a needle in a haystack !!Would be good to look for the bits and try and recover the other part of the bolt. the shape of the break could give an indicationa and also you should be able to see what grade it was by the marking son the head. It's possible that the wrong garde bolt was used.
I would agree with this. I have changed belts on my T4 & wifes Polo[previously changed by VW] & both weren't tight enough when I undid them. The torque on the T4 is so it's hard to achieve using proper tooling it's unlikely to be overtightened.If this happened while the van was running, it is possible that the bolt unloosened itself enough caused the vibration pulley to wobble around so much that it caused the bolt to snap and took out all of the belts at the same time. The vibration pulley is a substantial mass and could easily cause a bolt to snap if it was rattling around freely on the end of a loose bolt.