Yorkie
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| posted on 14/6/17 at 08:27 PM |
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Hub nuts on Sierra driveshaft
I'm in the process of changing the Sierra push in shafts and think I have a problem.
The replacement shafts I've got have the L/H thread on the offside (longer shaft) and R/H thread on the nearside which is different to what the
Haynes manual says. (L/H on left side)
Is this OK?
If not, are they easily changed or am I looking at new shafts?
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SteveWalker
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| posted on 14/6/17 at 08:37 PM |
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L/H on the offside sounds right - having the tendency to tighten when the shaft is rotating normally.
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big-vee-twin
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| posted on 14/6/17 at 08:43 PM |
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Hi Mate,
Right hand thread on Offside, Left hand on Nearside the on newer ones I have fitted. So the nut revolves in the tightening direction not loosening.
My original Pair had RH thread on both, so I drilled carefully with carbide bit and put a split pin in the end for security.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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loggyboy
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| posted on 14/6/17 at 08:58 PM |
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Haynes is incorrect. Its the counter intuitive way, it's to stop precessional rotation. Google it.
[Edited on 14-6-17 by loggyboy]
Mistral Motorsport
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SteveWalker
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| posted on 14/6/17 at 10:14 PM |
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quote:
Originally posted by SteveWalker
L/H on the offside sounds right - having the tendency to tighten when the shaft is rotating normally.
Further research shows that I am wrong - despite the couple of searches I checked before commenting agreeing with me!
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craigdiver
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| posted on 26/9/17 at 06:48 PM |
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Sorry to resurrect this but for the benefit of my pea brain, just to ensure I am fitting the correct shaft to the correct side of the car;
LH thread on the left (UK nearside)
If it ain't broken, fix it anyway (just because).
Building - BMW powered Haynes Roadster/442E hybrid.
Volvo C30 T5 Polestar
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loggyboy
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| posted on 26/9/17 at 07:16 PM |
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Left hand thread should be on the right
[Edited on 26-9-17 by loggyboy]
Mistral Motorsport
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craigdiver
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| posted on 26/9/17 at 07:18 PM |
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quote:
Originally posted by loggyboy
Left hand thread should be on the left yes.
[Edited on 26-9-17 by loggyboy]
Thanks :-)
If it ain't broken, fix it anyway (just because).
Building - BMW powered Haynes Roadster/442E hybrid.
Volvo C30 T5 Polestar
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loggyboy
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| posted on 26/9/17 at 07:20 PM |
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quote:
Originally posted by craigdiver
quote:
Originally posted by loggyboy
Left hand thread should be on the left yes.
[Edited on 26-9-17 by loggyboy]
Thanks :-)
Sorry i got it wrong. It takes me 5 mins of waggling my finger to work it out. Its the way you think it will unwind itself with the forward motion,
but in fact its the opposite due to precesional rotation. It should be on the right.
[Edited on 26-9-17 by loggyboy]
Mistral Motorsport
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nick205
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| posted on 27/9/17 at 07:54 AM |
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My Sierra donor (push-in) drive shafts were the same when removed from the donor and after a refurb went straight onto my MK Indy. Research on here
and with my local Ford main dealer confirmed they're correct this way.
As mentioned above the principle is for the nuts to tighten (rather than loosen) in normal rotation.
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jps
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| posted on 27/9/17 at 08:10 AM |
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quote:
Originally posted by loggyboy
Haynes is incorrect. Its the counter intuitive way, it's to stop precessional rotation. Google it.
[Edited on 14-6-17 by loggyboy]
You get lots of pages about the earths rotation but nothing I could see about Sierra hubs....
Can't actually pick out the correct answer from this thread. Is it LH on the near side or the offside?
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loggyboy
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| posted on 27/9/17 at 08:33 AM |
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quote:
Originally posted by jps
quote:
Originally posted by loggyboy
Haynes is incorrect. Its the counter intuitive way, it's to stop precessional rotation. Google it.
[Edited on 14-6-17 by loggyboy]
You get lots of pages about the earths rotation but nothing I could see about Sierra hubs....
Can't actually pick out the correct answer from this thread. Is it LH on the near side or the offside?
https://en.wikipedia.org/wiki/Precession_(mechanical)
Left hand thread on Right (offside in UK)
[Edited on 27-9-17 by loggyboy]
Mistral Motorsport
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craigdiver
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| posted on 27/9/17 at 09:42 AM |
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quote:
Originally posted by nick205
My Sierra donor (push-in) drive shafts were the same when removed from the donor and after a refurb went straight onto my MK Indy. Research on here
and with my local Ford main dealer confirmed they're correct this way.
As mentioned above the principle is for the nuts to tighten (rather than loosen) in normal rotation.
Nick, for the sake of my sanity!, which side of the car had the LH thread when you removed from donor?
Cheers
If it ain't broken, fix it anyway (just because).
Building - BMW powered Haynes Roadster/442E hybrid.
Volvo C30 T5 Polestar
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jps
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| posted on 13/4/18 at 09:31 AM |
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Craig - you asked a few months old I know but...
I am just about to paint my hub carriers then fit up the whole back end. I went out and looked at my donor Sierra - which still has it's, drum,
backend on it (I am using a disc back end that I got elsewhere). On the donor the L/H thread hub nut is on the nearside.
So - either Ford built it like that (and L/H nut DOES go on the nearside), or during the cars life time someone has taken the driveshafts off and put
them back on the wrong way round...
[Edited on 13/4/18 by jps]
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40inches
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| posted on 13/4/18 at 09:46 AM |
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quote:
Originally posted by jps
Craig - you asked a few months old I know but...
I am just about to paint my hub carriers then fit up the whole back end. I went out and looked at my donor Sierra - which still has it's, drum,
backend on it (I am using a disc back end that I got elsewhere). On the donor the L/H thread hub nut is on the nearside.
So - either Ford built it like that (and L/H nut DOES go on the nearside), or during the cars life time someone has taken the driveshafts off and put
them back on the wrong way round...
[Edited on 13/4/18 by jps]
That seems right. Logically the nut should tighten up the same way that the wheel revolves
My old ones had the L/H thread on the nearside.
Just to throw a spanner in the works. I have fitted new drive shafts, the drivers side is around 60mm longer than
the nearside, and they both have r/h threads
Should say that after 3000miles they are still on the car and when I checked the nut torque a few weeks ago it was still 220ft/lb on both sides.
[Edited on 13-4-18 by 40inches]
[Edited on 13-4-18 by 40inches]
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jps
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| posted on 13/4/18 at 12:56 PM |
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quote:
Originally posted by 40inches
That seems right. Logically the nut should tighten up the same way that the wheel revolves
[Edited on 13-4-18 by 40inches]
This is pretty much how I see it also - but Loggyboy is admanat in several posts above that it's the offside...
I have turned up some discussion on this here: https://www.f1technical.net/forum/viewtopic.php?f=6&t=11503 (some of which seems to be about wheels
without studs - i.e. F1 cars) which still doesn't help me much...
Oh - and p34-35 of this edition of RaceTech https://issuu.com/thisisnotadrill/docs/rceteh115webpub
[Edited on 13/4/18 by jps]
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