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How long would it take to remove a stuck outer race?

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RickTaff
Nitrous Nuisance



Joined: 28 Jul 2016
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PostPosted: 17:26 - 20 Mar 2017    Post subject: How long would it take to remove a stuck outer race? Reply with quote
Outer race of old bearing is stuck inside wheel hub... taking it to a welding shop tomorrow and they're going to have a go at removing it with oxy torch, or even welding a bead onto the race (whatever that is)


Any idea if this should be a short, quick job using this method?
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 17:54 - 20 Mar 2017    Post subject: Reply with quote
20 seconds.
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zark
Trackday Trickster



Joined: 18 Dec 2013
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PostPosted: 18:07 - 20 Mar 2017    Post subject: Reply with quote
yes, it will be a quick job. not as quick as you larruping it with a hammer though.
as big a chisel/drift/old screwdriver/clutch pushrod/anything solid as you can get in the hole from the other side.

big hammer

Like the man says ^^... 20 seconds. You're not keeping it. Smash it. There's nothing holding it in apart from friction.

Hit it. Then hit it again.

Repeat until it's out.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 18:09 - 20 Mar 2017    Post subject: Reply with quote
More than 20 seconds. Less than 2 minutes.
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Matt B
World Chat Champion



Joined: 01 May 2012
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PostPosted: 10:44 - 21 Mar 2017    Post subject: Reply with quote
I took a set of bearings out of the ZX6 rear wheel yesterday. It literally takes minutes. Warmed the hub with a hot air gun then hit it with a hammer an a long drift.

You are sure there isn't a circlip holding it in there?
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Rogerborg
nimbA



Joined: 26 Oct 2010
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PostPosted: 10:49 - 21 Mar 2017    Post subject: Reply with quote
Tell your husband to just keep the engine running.
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bugeye_bob
World Chat Champion



Joined: 05 Sep 2013
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PostPosted: 11:17 - 21 Mar 2017    Post subject: Reply with quote
Matt B wrote:
I took a set of bearings out of the ZX6 rear wheel yesterday. It literally takes minutes. Warmed the hub with a hot air gun then hit it with a hammer an a long drift.

You are sure there isn't a circlip holding it in there?


Wouldnt heating it all up actually make it harder to remove ?
heat makes things expand, I put bearings in the freezer before fitting them.
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Matt B
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PostPosted: 11:27 - 21 Mar 2017    Post subject: Reply with quote
bugeye_bob wrote:
Wouldnt heating it all up actually make it harder to remove ?
heat makes things expand, I put bearings in the freezer before fitting them.


Yes heat makes things expand. If you heat the hub around the outside of where the bearing sits it expands, this makes it easier to remove.

Look at the coefficients of linear thermal expansion. Ali and it's alloys expand more than steel/stainless, so even if the bearing heats up inside the hub it won't expand as much as the hub around it.

Chilling a bearing to shrink it when fitting is fine but the OP wants to remove a stuck outer race.
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 17:40 - 21 Mar 2017    Post subject: Reply with quote
bugeye_bob wrote:
Matt B wrote:
I took a set of bearings out of the ZX6 rear wheel yesterday. It literally takes minutes. Warmed the hub with a hot air gun then hit it with a hammer an a long drift.

You are sure there isn't a circlip holding it in there?


Wouldnt heating it all up actually make it harder to remove ?
heat makes things expand, I put bearings in the freezer before fitting them.


Differential expansion. Works like the bi-metallic strip in a thermostat switch. One metal expands ore than another for same amount of heat.

Alluminium expands more per degree than steel, so if you have a steel brearing race in alloy hub, heat will make both expand, but the hub, on the outside will expand more than the bearing, so the interferance between the two will get smaller, and bearing more likely to drop out.

The bead weld takes this a bit further; adding a ring of hot molten metal to the bearing, will heat the assembly, both race and hub, and you will get differential expansion... but the locally applied weld will be much hotter still, and when the weld cools, will contract even more, and shrink the race a little more with it

Even if hardened race was in a steel hub, with little or no differential expansion to be had, the very high temperature, locally applied heat, could still cause the same effect from getting the inner race that much hotter, and so shrunk more when cooling, than outer hub.

It's using the cooling distortion you usually try and avoid in welding to positive effect.
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Matt B
World Chat Champion



Joined: 01 May 2012
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PostPosted: 18:13 - 21 Mar 2017    Post subject: Reply with quote
Teflon-Mike wrote:
Differential expansion... etc. etc.


Mike, did you even read the post where I already explained that? Autopilot keyboard.
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sickpup
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Joined: 21 Apr 2004
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PostPosted: 17:41 - 23 Mar 2017    Post subject: Re: How long would it take to remove a stuck outer race? Reply with quote
RickTaff wrote:
Outer race of old bearing


I think people may not have read this correctly.

The bead of weld or welding a plug in so it can be knocked out. Assume about 30 minutes work.
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Matt B
World Chat Champion



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PostPosted: 17:56 - 23 Mar 2017    Post subject: Re: How long would it take to remove a stuck outer race? Reply with quote
sickpup wrote:
RickTaff wrote:
Outer race of old bearing


I think people may not have read this correctly.


Based upon what exactly? From what I see people are talking about removing bearings.
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 19:46 - 23 Mar 2017    Post subject: Re: How long would it take to remove a stuck outer race? Reply with quote
Matt B wrote:
Based upon what exactly? From what I see people are talking about removing bearings.


Pretty much what you just wrote. This isn't a complete bearing from the OP's first post it is just the outer race.
The outer race will often sit lower that the shoulder of the wheel so just knocking it out isn't an option as there is nothing that you can knock out.
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dydey90
World Chat Champion



Joined: 01 Oct 2013
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PostPosted: 20:11 - 23 Mar 2017    Post subject: Reply with quote
Shouldn't be a problem as long as there's not a lip there to stop you getting a drift in.

I've seen bearings refuse to move after being pounded with a hammer, but then just drop straight out with enough heat.
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Matt B
World Chat Champion



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PostPosted: 11:02 - 24 Mar 2017    Post subject: Re: How long would it take to remove a stuck outer race? Reply with quote
sickpup wrote:
The outer race will often sit lower that the shoulder of the wheel so just knocking it out isn't an option as there is nothing that you can knock out.


Often, but not always. Depends upon the bike, which wheel and the specific bearing. Rear wheel bearings sitting behind a sprocket carrier for example tend to have no shoulder.
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V2
Nearly there...



Joined: 06 Feb 2006
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PostPosted: 14:44 - 24 Mar 2017    Post subject: Reply with quote
or this...

https://www.amazon.co.uk/Bearing-Puller-Remover-Internal-Hammer/dp/B00L7FO2EW/ref=sr_1_3?ie=UTF8&qid=1490363023&sr=8-3&keywords=bearing+slide+hammer
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 15:42 - 24 Mar 2017    Post subject: Reply with quote
So yeah. More than 20 seconds, less than 2 minutes.

https://youtu.be/w6ZWAnuDAG4
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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Commuter_Tim
World Chat Champion



Joined: 09 May 2013
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PostPosted: 23:08 - 24 Mar 2017    Post subject: Reply with quote
stinkwheel wrote:
So yeah. More than 20 seconds, less than 2 minutes.

https://youtu.be/w6ZWAnuDAG4


Good old Stinky, fisting Bovine anus and putting an end to bickering for the good of mankind.
Neither are pretty jobs, but someone has to do them. Laughing
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neptune8
Nova Slayer



Joined: 22 Nov 2016
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PostPosted: 12:44 - 26 Mar 2017    Post subject: Reply with quote
If a bead of weld is applied with an arc welder, as the job cools afterwards, you hear a click as the outer bearing cracks across its width. It then comes out easily. Been there done that.
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