Re: 156 2.0 ts cambelt change
If you don't loosen the bolts, there is an extreme likelyhood that you won't get the timing spot on. One reason is that the old belt will have stretched, and you are refitting a new belt in the same position that the stretched one cam off from. It may only be 1/2 to 1 tooth out but it will still be wrong.
An example.. I bought my car, and 44,000 miles previously it had last had the belts changed. I spoke to the garage that last changed the belts and they told be that they used the mark method without camblocks.
On removing the covers I attempted to fit the camblocks to see how close the timing was before I started, and it was miles out. If I had used the marking method I would have set the belt in the same position that I had taken it off, which would have been wrong.
After doing the job the car felt a lot better.
If you are changing the variator, as I think you should when doing the belts you have to loosen the inlet sprocket.
Giulietta 2.0JTDm (170), BMW 335i Cabrio