If the belt is TIGHT then no should be OK..if it is not then the belt will slip. When you go to change the belt that part will have to be replaced. German Star has them for a good price. It is kind of a PITA job though doable. EPC online has the exploded view of the job and is nice to look and the one nut towards the back is easy to loose down in the depths of the intake manifold so be careful. The Allen bolt the guys are referring to is located below the water pump left of the power steering pump. It is hard to see use a mirror and a light to find it.is it bad if I drive around with this problem?
I just did this job and it IS indeed left counter clockwise to TIGHTEN...Righty LOSOSY backwards...counter intuitive....Aka the wrong way IS the right wayEDIT: Disclaimer: I cannot tell for certain if this IS a left-hand thread setup or not... take all the below with some salt.
You didnt provide much detail about how you 'broke it'... but
This 'nut' is LEFT-HAND THREAD... meaning that turning it RIGHT 'removes' it from the bolt/rod it attaches to... and, when working correctly, PUSHES the rod DOWN to tighten the belt (when the main bolt is loose enough).
If youve been turnig it RIGHT and suddenly it seems 'broken' it has likely come off the end of the bolt/rod it threads onto. (EDIT) OR has stripped as was mentioned before...
One way to know for sure would be to turn it LEFT onto the rod (hoping ot goes on straight), and see if the 'nut' starts retreating into the hole and/or becomes difficult to turn (also an indication that it is on crooked... unfortunately). if EITHER of these happens you are likely okay.... pending confirmation that the tensioner is working well and the main bolt is tight.
Hope that helps some!