XC70 Towbar Attachment Bolts
Hi,
I know your post is from some time ago but I still thought I would comment. You do not say if you re-used the original bolts or you bought replacement attachment bolts from Volvo.
I am just about to do a similar job and fit a previously fitted/used towbar to my XC70. Reading through the fitting instructions from Volvo, the bolts need to be torque tightened to 90 NM and then tightened a further 60 degrees. This method stretches the bolt a certain amount and puts a locking tension on the bolt to prevent it coming undone. It is also used on cylinder head bolts to more accurately control the clamping force. If the bolt is re-used there is a real risk of bolt failure if the bolt has been stretched beyond its elastic limit.
Volvo do a replacement bolt kit for towbars which costs about £30. I think the bolt kit would be money well spent for anyone fitting a pre-used towbar.
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