Has anyone snapped their tensioner setup? This is the 2nd time this has happened and frankly getting tired of it. This time it happened trackside as I was replacing a belt. The parts were warm/hot and felt the metal just fatigue, twist and break off. I was using a box wrench at the time and applying hand pressure.




Thinking of new ways to make this part more robust

 

I havent sheared mine. I do have lathe and a mill, so I can make my own. If mine takes a crap. I will make both you and I one out of a high carbon steel, then yellow cromate the parts.

Check with SOS to comfirm the material. If that is not SS which it appears to be, you can oil quench it yourself in 5minutes, and it would greatly reduce your chances of torsional shear. If it is SS, then work hardening is your only option, which there would be no way for you to do on alread formed thread.

 

That sucks. No issues with mine, but I don't remove my s/c belt as often as you (I believe you mentioned that you remove the belt for daily driving or something). I 've been tightening my tensioner pulley nut 1/4 of a turn after hand tightening. Maybe your cranking it down too much?

 

I will be forever grateful if you can make a bulletproof one. The material is indeed SS.

Yes, I do remove my belt during track/street riding. Also change the belt maybe 3-4 times at the track whenever it snaps (an ongoing issue I'm trying to correct). Ever since I broke my first piece, I've been very cautious to not apply too much force when tightening. During this second failure I could really feel the metal twist like butter. I'm also using a ARP bolt which has more thread engagement (longer nut) to ensure I don't apply too much force.

As of now I'm thinking of milling out the threaded portion and drilling/tapping the shaft itself. I can use my own hardened bolt and stick it thru.