Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: Winterfield on March 26, 2019, 09:42:32 PM
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So I was struggling to get the rear wheel dampers out of the hub, as well as the bolts themselves, so rather than risk destroying the hub I handed it over to a local tuning and machine shop here in Edinburgh.
They were able to remove the bushings, but to do so they drilled into the hub from the back to get them out.
Have they ruined my hub? They assured me that it won't have affected the structure/performance.
(https://i.imgur.com/3Hkj4P9.jpg)
(https://i.imgur.com/ABgtD2T.jpg)
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I think they have. That shouldn't be necessary because a proper machine shop would be able to get them out without drilling through. It's possible to burn the rubber out and chisel/split the metal sleeve without damaging the hub.
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That's what I thought. I could have ruined the hub myself and saved £50.
Any chance of repair?
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Take it back to the machine shop and tell them to alloy repair the holes that they have made and tell them to skim the drum liner while they are at it ;)
Just pulled a hub out of stock and though what they have done is not very professional, you can get away with those holes. You could insert the new bushes and apply some plastic weld to the inner hub.
[attachimg=1]
[attachimg=2]
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Thanks Trigger.
I have no intention of going back to that shop for any work, paid or unpaid. I had a bunch of other stuff I was going to ask them to do, but I'll show my opinion with my wallet.
My main concern is of the structural weakness of the hub caused by the holes. If it's unlikely to be a concern, I'll find someone to repair the holes and press on with these hubs.
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Nothing useful to add here - I'm just noting that in the original post, the photos aren't showing on my computer - just a "photo-sized" spacer with a little circled dash in it. But others have replied, so I guess it's just me?
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Nothing useful to add here - I'm just noting that in the original post, the photos aren't showing on my computer - just a "photo-sized" spacer with a little circled dash in it. But others have replied, so I guess it's just me?
Nope same here
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Yeah, me too!
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I couldn't see the original pics either, just replied to the description of the problem.
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I could see the pictures, but as oddjob, clearer what's gone on with Trigg's view of other side.
I'd have tried it with a concrete expanding rawlbolt fixing. Sized correctly and wound up inside the sleeve, then use a slide hammer on it to drift out.
:)
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Updated with re-hosted pictures, apologies!
I really wish I had given it a go, but I was worried I'd do more damage than good.
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No pics for me to see either but now I’m replying, the pics show up in the lower previous posts - weird! Anyhoo, at least they have left the strengthening webs in place - if they had been cut through I would have said it was scrap. If you intend using it I would remove any burrs from Roger the bodger’s holes inside and out and leave a little radius on the edges to prevent ‘stress raisers’ where cracks can start. If, however you decide not to use it, I might have a spare but not able to check for a week or so on my return. Unfortunately it too will still have the metalastik bushes in.
Ian
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F me did they try selling you a pound of sausages as well. There are loads of methods to try before resorting to that. No doubt time and cost became a factor. The soggy paper towel method is very effective on blind bearing /bush removal. I was shown this method over 40 years ago and have used it many many times. It even works on broken seloc/roll/spring pins.
https://www.youtube.com/watch?v=ggsEewAg2YM
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Very odd way to resort to doing it like that...... not how I would have tried to do it. Sure I have removed a fair few over the years and never had to resort to that.
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The soggy paper towel method is very effective on blind bearing /bush removal. I was shown this method over 40 years ago and have used it many many times. It even works on broken seloc/roll/spring pins.
https://www.youtube.com/watch?v=ggsEewAg2YM
Now this I gotta see! To the internets, Robin!
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Adding that to the tips list next time I have some blind bearings to remove, in fact I think I have a rotating centre bearing to renew its bearings on. With respect to the machine shop who did the hub job this thread started with, I dabble in machineing jobs as time permits - on they might argue time vs cost constraints to why they did the job like that but frankly when a job like that crops up, a few minutes googling non destructive solutions is something well worth doing, every days a school day and I don't charge my customers for doing a bit of research before wasting time and materials with a bodge rather than doing it properly, bottom line is I'm teaching myself another skill and thsts handy. When I worked for an engineering firm, likewise I didn't put the time figuring out things like that on the job sheet but I did try a bit harder to avoid butchering the object
I was meant to be salvaging. I've removed lots of those type of bushings from motorbike wheels over the years and never had to drill the hub to do it, from memory I think a rawl bolt / expanding concrete fixing has served the perpouse a few times as has drilling through the bushing rubber portion and collapsing in the remains a bit with a chisel. Just seems a very odd way to resolve the issue.
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F me did they try selling you a pound of sausages as well. There are loads of methods to try before resorting to that. No doubt time and cost became a factor. The soggy paper towel method is very effective on blind bearing /bush removal. I was shown this method over 40 years ago and have used it many many times. It even works on broken seloc/roll/spring pins.
https://www.youtube.com/watch?v=ggsEewAg2YM
Time and cost did become a factor, as he charged me more because he said they were a pain to get out. Next time I'm going to save my money and give it a go myself.
Thanks for that link, something to try for next time.
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No pics for me to see either but now I’m replying, the pics show up in the lower previous posts - weird! Anyhoo, at least they have left the strengthening webs in place - if they had been cut through I would have said it was scrap. If you intend using it I would remove any burrs from Roger the bodger’s holes inside and out and leave a little radius on the edges to prevent ‘stress raisers’ where cracks can start. If, however you decide not to use it, I might have a spare but not able to check for a week or so on my return. Unfortunately it too will still have the metalastik bushes in.
Ian
I think for now I'll press on with it (perhaps try to have it repaired somewhere else), at least to make some progress. I would be very happy to take you up on that spare hub when you have a chance to check, thank you.