Evening all. Just installing a TTX rear shock. Got it all back together but sheared that torx bolt. Managed to get it out so just need another one. Thing I don’t get is it’s alloy and the Manuel states to torque to 60Nm! It sheared at well under this. I know the 3 other bolts with green arrows are 45Nm. Anyone had similar issues?
Well done that man !! A few obvious questions first,...you sure the torque wrench was set to Nm and not lbs/ft?? I know it sounds daft but we’ve all overlooked stuff like this? Also in your second pic, the edge where it’s sheared looks like there’s an old crack already, it’s slightly darker and weathered in places as though it’s already been partly cracked? New bolt will sort it but I can understand your frustration with it when you’ve done everything by the book
Haha, wouldn’t be my first but my first in a long time. Not sure there was a previous crack. Are you referring ring to the slot I dremeled in to get the threaded part out? Wound the torque wrench back down but looks like I’m not the first. People seem to fit a different linkage with one straight bolt through with a nut on the back. Still can work out why they say 60Nm on an alloy bolt.
Did you use Bradders's hammer? thought you were an engineers kinda man.... did you not feel it going that way before the ping?
I’ve just done mine to 45nm, but I didn’t remove the lower rocker bolt, why did you? No way is it 60nm, that’s more than the brake callipers!!
Cheers Phil. I wanted to grease the pivot sleeve. I didn’t think it could have been 60Nm but the manual says so. It’s the only M14 bolt I could find there...
My 5 pence worth. Torque figures are not very acurate as the actual clamping load and therefore stress on the bolt depends on the friction in the assembly. I did some testing once to see at which torque a specific M8 stud would plastically deform. In this case, when bone dry cleaned with degreaser it was 45Nm. The same stud with copper slip stretched at 35 Nm and when lubricated with a light oil it was below 30Nm. So 60 Nm might be fine dry or with a specific lubricant or threadlock perhaps but can be much too much in other circumstances.
Not sure if it’s a mistake or what. I’d have thought about 30 with a bit of thread lock and job’s a good un. I greased under the head too...
Greasing under the head will massively reduce friction and up the load on the bolt. I would agree with 30 and a soft thread lock in this case. I'd probably check it occasionally.
Fair play mate, agreed it says 60nm the only thing is normally they say +_10% don’t they? So maybe on the new one go 57nm ish and a tiny tiny bit of thread lock. I’ll be honest the bolts on my V2 were really greased, all along the threads, excessively so I would say. i regreased the working parts and added a tiny smear of thread lock because actually 45nm doesn’t feel that much! you could have somehow just caught a bolt that’s been over torqued in the past? Assuming you aren’t the first owner
Maybe mate. Not the first owner but only 3K miles and two years old. Who knows... Problem is finding another M14 x 1.25 x 40mm now the dealerships are closed and it’s not a common size bolt. At least the weather looks shit round here for the next couple of weeks. Won’t be missing much riding time!
They do snap. Mine are changed every time my shock comes out. I’ve unluckily had one snap whilst racing. Turn 1 at assen! Got some TV time but for all the wrong reasons
Cheers lads. Looks like a possible mod is to fit a Ti bolt all the way through and a flanged nut on t’other end.
