Torque settings.. (Slave)

[Jhonno]

Namely the slave..

Listed above as 15 lbft, which is 20NM...

Which just sheared one of the bolts for my new RP slave allen head bolts.

I am worried I have been a twit, but I can't seem to see where. Am now obviously pissed off I have a snapped bolt in my bellhousing.

Edited by Jhonno on Friday 21st June 23:49

[Supateg]

Hi, never taken out the slave, but I guess original bolts were about 8.8 high tensile steel?
So 15 lb ft is about right.

Just looked at the RP website, they state the bolts are stainless, so require lower torque, about 6 lb ft ish

http://www.fastenal.com/content/feds/pdf/Torque%20...

Stainless steel bolts are lower tensile strength than std HT steel bolts.

At least it will be easier to drill out and extract than a steel bolt.

-Craig

Edited by Supateg on Saturday 22 June 00:27

[Jhonno]

Hmm.. I know stainless bolts do have a lower tensile strength, but I thought the torque would be to do with the sealing of the slave..

Probably best to just ring them and ask what they torque them up to..

Indeed, easier to drill, still a pain though. Pissed me right off, so just closed up shop and went in for the night.

[Supateg]

Torque is to do with stopping the fastner undoing itself.

Here

http://www.amazon.co.uk/Carroll-Smiths-Fasteners-P...

Good book by Carroll Smith, Nuts Bolts & Fastners

Well worth buying, all you need to know about Bolts and Torque etc.

Oh, has your torque wrench been calibrated recently? It could be out.

[Supateg]

Always best to pack in, get some sleep, A fresh head and a new day works wonders.

Yes I agree give RP a ring, You would have thought a brief note of guidance from them for a non standard part when purchasing?

[Jhonno]

I think I was over thinking it a little.. As it was sealing 2 faces I figured the torque was to do with this, in this case. My bad.

Cheers for the link, will have a look.

If it was a non standard tightening procedure I'd have expected a note with the slave to specify this..

[ukkid35]

What torque wrench were you using?

[Jhonno]

ukkid35 said:

What torque wrench were you using?

A weight applied at a distance.. My lower scale torque wrench seems to have gone walkies. I think a mate must have it, just. a bit miffed to spend £80 "replacing" something I already have.

3 of the bolts tightened up btw.. The last one sheared.

[ridds]

10Nm would be way more than enough for even an 8.8 in that diameter.

Important thing is the thread lock!!

[Jhonno]

ridds said:

10Nm would be way more than enough for even an 8.8 in that diameter.

Important thing is the thread lock!!

Noted.

Assumption being the mother of all fk ups, and I have assumed.. Badly.

No threadlock applied either.. Again I did wonder, but assumed (there it is again) there would be notation with the slave to this effect..

[Jhonno]

I do feel quite the dunce on this one.. Tired on a Friday night was probably not the best time to have been working on it.

[ridds]

Thread lock is VERY important.

It's why they are usually a complete arse to get out. Not sue to corrosion. Is the RP slave still Aluminium? I guess that's why they supply stainless bolts.

[Jhonno]

Yup.. Logical really due to nature of the component and location.

They are indeed aluminium still, as you say, hence the stainless bolts.

[Jhonno]

I will just go and sit here for a while, till I know better...

[Supateg]

Don't beat yourself up about it.

We have all done things in hindsight were daft,

At least you had the honesty to post on here for help; and In doing so helped out the members on this forum to this issue.

[ridds]

Yeah we all make mistakes. At least you spotted yours before putting it all back together or thinking "it'll be fine..."

[ukkid35]

ridds said:

Yeah we all make mistakes. At least you spotted yours before putting it all back together or thinking "it'll be fine..."

Yes - but that's not mission critical. The ones that give me pause for thought are cam sprocket bolts and such like.

On the way home from the Spa/Ring at Easter I noticed that all the steering boss bolts were backing out, which was amusing in it's way. I comforted myself with the knowledge that it wasn't my fault because I'd never been there - and then realised that was even more worrying.

[Jhonno]

ukkid35 said:

On the way home from the Spa/Ring at Easter I noticed that all the steering boss bolts were backing out, which was amusing in it's way. I comforted myself with the knowledge that it wasn't my fault because I'd never been there - and then realised that was even more worrying.

Anyone know the bolt size? Forgot to bring one into work to order new ones..

M6x20? M6x15?

[ridds]

I wrote M6 x 16 in this very old post for some reason...

Here

[Jhonno]

Thanks!!

If I've wasted £1.40 it is your fault though..