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Q: Breaking timing belt /tensioner bolt on 2005 Hyundai Tucson

The timing belt/tensioner bolt Has broken 3 times and mechanics can not find the reason.Last time did some motor damage and not under warranty so we have to fix it but if it is going to happen again I am wondering if it is worth the trouble . Several mechanics have been called and none can figure the reason.Timing belt was replaced at 60000 miles as maint. book stated and 3 week later bolt broke and has happened 2 times since then.My mechanics are very good and they are stumped.As is Hyundai !! Of course they will say it is because I didn't have it done by a cert.Hyundai mechanic !!
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If it is an independent repair shop you trust that has been doing the work there is a professional service called Identafix. They only deal with professional repair shops. They are in the Minnesota 651-633-8007. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base. Someone there may have seen the problem before. Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out lots of great information.
Thanks .I have given the shop this info and they are following thru .Ordering all parts thru Hyundai ,too.
You didn't say if the parts were OE or aftermarket, but here are my thoughts:
There was a similar problem on some Audi / VW aftermarket tensioner bolt, which was recalled and removed from the shelfs - after many engine damage.
I'd suggest to use the OE or a high grade bolt and tighten to the manufacturer's spec.
Also make sure the cam and crank pulleys are clean, since rubber could build up from the original belt which could cause vibration.

Thank you .I am going to relay this to our mechanic , THANKS !!!
And yes the bolts are coming from the Hyundai dealership .
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