Chris_Xtreme
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| posted on 30/9/16 at 03:07 PM |
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how snug does a lower wishbone bush bolt hole need to be?
HI all,
I had a rusted together and broken lower bush on one side and had to cut it out.. ended up getting a plate welded on etc to make it good.
I replaced the bush and all seems good.
I decided to do the other side, it was indeed rusted together, but this time the bolt head sheared the bolt inside the hole, so I thought I would
drill the bolt down, this worked well, but it made the hole a bit bigger than the bolt, say 11ishmm rather than the 10mm it was for the bolt to fit in
snug.
is this a problem? should I do what I did before I welt a plate on to get me back to a tight fit?
cheers for any words of wisdom!
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Slimy38
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| posted on 30/9/16 at 04:16 PM |
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I may get shot down for this, but since the bracket is clamped between the bolt head/nut and the crush tube, I don't believe it should matter
that much?
(blindfold is on, fire away...  )
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Chris_Xtreme
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| posted on 30/9/16 at 04:20 PM |
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which poses another question for me then - should I be doing these up mega tight?
I haven't done, but I've only ever adjusted them on this car and as the previous bushes were rusted up, they were spinning on the outside
of the bush.
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JC
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| posted on 30/9/16 at 04:37 PM |
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If you are worried, weld a thick washer on of the appropriate size? I seem to remember seeing this suggested in a magazine once....
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Chris_Xtreme
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| posted on 30/9/16 at 05:13 PM |
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quote:
Originally posted by JC
If you are worried, weld a thick washer on of the appropriate size? I seem to remember seeing this suggested in a magazine once....
I guess you are right, being that I have posted the question, makes me think I should do something about it anyway.
a thick washer would save me cutting up and drilling a bit of metal, interesting idea.
I'd still like to know, if anyone knows, if it is necessary or not.
cheers
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coyoteboy
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| posted on 30/9/16 at 06:56 PM |
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Unlikely to use the bolt as the locator unless the shank extends all the way through normally. It will just use the clamp force to resist movement.
I'd just go for Max recommended torque for your fastener.
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Chris_Xtreme
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| posted on 30/9/16 at 07:09 PM |
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quote:
Originally posted by coyoteboy
Unlikely to use the bolt as the locator unless the shank extends all the way through normally. It will just use the clamp force to resist movement.
I'd just go for Max recommended torque for your fastener.
the shank doesn't go all the way through the hole, just the bolt.
I'd best be going back to the guys who made up the bush for me to find out a suggested torque setting!
cheers, Chris
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ashg
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| posted on 30/9/16 at 07:27 PM |
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just weld a washer on.
its a pretty common thing to do when you want to use a 12mm bolt on a suspension bracket with a 1/2 inch hole. the clamping force between the
suspension bracket, the bush and the bolt is what holds everything in place.
having a hole that is slightly too big makes suspension alignment tricky as you can never get everything back in exactly the right place if the hole
is too big and your taking the suspension bolts in and out to do maintenance.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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Chris_Xtreme
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| posted on 1/10/16 at 10:10 AM |
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thanks all - I'll weld some bits on.
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Banana
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| posted on 5/10/16 at 05:26 PM |
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So would it not be better to get crush tubes with 12mm ID?
I was putting mine back together today and was slightly concerned by the amount on play the bolt has in the tube.
I know its meant to be clamped so the bolt size doesn't really matter, but if i was going to get some stainless tubes made up, would i be better
getting some with an ID on 12.1mm maybe? Has anyone else done this?
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CosKev3
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| posted on 5/10/16 at 06:50 PM |
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quote:
Originally posted by Banana
So would it not be better to get crush tubes with 12mm ID?
I was putting mine back together today and was slightly concerned by the amount on play the bolt has in the tube.
I know its meant to be clamped so the bolt size doesn't really matter, but if i was going to get some stainless tubes made up, would i be better
getting some with an ID on 12.1mm maybe? Has anyone else done this?
Your tubes could be for 1/2 UNF bolts,so about 12.8mm?
You are right ideally you need the correct bore tube for the bolts,as the movement you talk of can cause issues if you have to undo the bolt after you
have had the geometry set up.
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