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Oh no.....not another bolt.... - Printable Version

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+--- Thread: Oh no.....not another bolt.... (/showthread.php?tid=72697)

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Oh no.....not another bolt.... - anutz - 29-05-15

OK so i have really messed up again  :'( :'( :'( :'( :'( :'( :'(

Snapped a front mud guard bolt and i really am annoyed - was using a torque wrench to get it to 7NM but it just span round and round then snapped....WTF can i do about this!

yes i can ride without a fender but want to fix it....OMG

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Re: Oh no.....not another bolt.... - Paulfzs - 29-05-15

get drilling!

Re: Oh no.....not another bolt.... - anutz - 29-05-15

i am thinking left had drill bits might be best here after what i learned when the exhaust studs snapped.....

Re: Oh no.....not another bolt.... - Andy Clap - 29-05-15

(29-05-15, 06:44 PM)Paulfzs link Wrote:get drilling!
As the man said.
That's one bolt I would never have thought of using a torque wrench on.  Maybe something to be said for "Feels about right".



Re: Oh no.....not another bolt.... - anutz - 29-05-15

it was a cyclo-torque wrench specifically for low torque - and the service manual does state 7NM....so i figured i would do it right  :\

Re: Oh no.....not another bolt.... - Paulfzs - 29-05-15

7nm new, as above "feels tight enough" is what id use for this.

Re: Oh no.....not another bolt.... - anutz - 29-05-15

Relief.....manged to grab the tinest piece of it and it came out with ease with a pair of neddle nose pliers!!!!

WOHOOOO!

I might just get this back together - eventually!




Re: Oh no.....not another bolt.... - unfazed - 29-05-15

Are you sure the torque wrench was set to 7Nm and not set to 7lbf. 


Re: Oh no.....not another bolt.... - darrsi - 29-05-15

Were you using copper grease?

Re: Oh no.....not another bolt.... - anutz - 29-05-15

so yes wrench was in NM ( other scale is inch-pounds..)

and i was using copper grease...

I really am perplexed as to why it happened, but we all know its usally operator error....so i cannot figure out what i did wrong!

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Re: Oh no.....not another bolt.... - Paulfzs - 29-05-15

lucky then!


maybe it was a worn bolt

Re: Oh no.....not another bolt.... - anutz - 29-05-15

damn lucky - the tinest bit of thread left - i would like to know what happened - it felt like the bolt was twisting when i realised what happened.....exactly the same as the exhaust stud feeling thats what i thought oh no.....and stopped.....but it was too late - literally pinged off....

Re: Oh no.....not another bolt.... - Paulfzs - 29-05-15

it may have been done it too tight before and you just helped it finish itself off.

Re: Oh no.....not another bolt.... - anutz - 29-05-15

yes i like that idea - it was like that when i got there - that will do nicely for this one  :b

Re: Oh no.....not another bolt.... - Andy FZS - 29-05-15

7NM would be for a dry bolt if you put grease on then 7NM on the torque wrench would be greater due to the lower friction due to the grease if that makes sense.

Re: Oh no.....not another bolt.... - Jules-C - 29-05-15

Need to reduce the dry torque setting by 20% or more for greased bolt but can vary a lot depending on grease and materials.  Sometimes a low torque setting is given then an angular measurement given to avoid the problem so you tighten to 3nm say and then tighten another 30 degrees

Re: Oh no.....not another bolt.... - anutz - 29-05-15

Jules-C/Andy FZS - understood about the need to consider the effect of grease.....never considered it!

How would you reliably figure it out - is there a chart that shows how certain greases affect the fixings?


Re: Oh no.....not another bolt.... - anutz - 29-05-15

So can i ask - on bolts such as the suspension clamps, if they are greased - is that advisable or not, i am going to be doing a once over soon before the MOT, not sure wether i should copper grease all threads or not?

Re: Oh no.....not another bolt.... - Andy FZS - 29-05-15

Sorry I can't really advise on % of torque if greased.  I often put grease etc on bolts and seldom use a torque wrench. I tend to just nip things up until they're tight dependant on size. Not really helpful I'm afraid.

Re: Oh no.....not another bolt.... - anutz - 29-05-15

nah its ok m8 don't expect it, i have copper greased the threads on the yoke bolts and tightened them to recommended torque, will re-consider