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Maver
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 Posted: Wed Apr 02, 2008 10:00 pm Post subject: swingy arm thingy bearing. |
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the bearing the rear axle goes thru mounted in the swingy arm thingy that the exhaust mounts to........
what's the best (proven, not guesswork  ) method of extracting this bearing and refitting a new one??? heat or no heat? big socket and a nut & bolt???
anyone got the bearing dimensions so i can order a new one?
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booboo
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| Posted: Wed Apr 02, 2008 10:19 pm Post subject: |
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I`m sure Glenn used a press to get his out quick and easy
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Maver
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| Posted: Wed Apr 02, 2008 10:25 pm Post subject: |
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| booboo wrote: | | I`m sure Glenn used a press to get his out quick and easy |
glenns got a press???? 
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igarratt
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Location: ANDOVER, HANTS
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| Posted: Wed Apr 02, 2008 10:58 pm Post subject: |
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| Took mine out to get the arm powder coated and just tapped it out with a socket ...came out easy enough with out any heat and the put it back in same way and all is fine... |
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GAVSKIN
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| Posted: Thu Apr 03, 2008 5:20 pm Post subject: |
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| Maver wrote: | | booboo wrote: | | I`m sure Glenn used a press to get his out quick and easy |
glenns got a press???? |
i expect glenn used his thumb the nutter 
however you do it,it realy needs pushing out and pressing in as square as poss,a press is ideal if you can get to one? mav if you get stuck i have use of a fly press at work
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Maver
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| Posted: Thu Apr 03, 2008 5:48 pm Post subject: |
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thanks for the replies chaps 
| GAVSKIN wrote: | | however you do it,it realy needs pushing out and pressing in as square as poss,a press is ideal if you can get to one? mav if you get stuck i have use of a fly press at work |
thanks for the offer gav but we've got all sorts of fly and machine presses at work, it's just i use the scoot for work and if i did it at work and then the bearing place down the road has to order one in it's a bit of an arse.........
would my drill press (you've used it) combined with a socket, as a press tool, do the job ok or do you think it would be a bit feeble 
anyone got the bearing dimensions so i can see if the bearing shop has one in stock before i strip stuff down?
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CheekyThomas
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| Posted: Thu Apr 03, 2008 5:52 pm Post subject: |
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| You dont really need a press unless its grotty in there, they normally tap out easy enough, especially if youve got some heat source.... |
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rainham boy
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| Posted: Thu Apr 03, 2008 6:02 pm Post subject: |
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put the new bearing in the frezzer for a couple of hours or more as this shrinks it a bit and is easier to get in
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Maver
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| Posted: Thu Apr 03, 2008 6:08 pm Post subject: |
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| CheekyThomas wrote: | | You dont really need a press unless its grotty in there, they normally tap out easy enough, especially if youve got some heat source.... |
i hear what your saying CT but wouldn't heating expand the metal and grip the bearing more?
| rainham boy wrote: | | put the new bearing in the frezzer for a couple of hours or more as this shrinks it a bit and is easier to get in |
will do m8
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CheekyThomas
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| Posted: Thu Apr 03, 2008 6:35 pm Post subject: |
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Nope it does the opposite.... the alloy brace expands quicker than the steel bearing and therefore it gets looser....
...keeping the case warm and fitting a cold bearing will make it very easy indeed, it will probably just drop in. |
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Maver
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| Posted: Thu Apr 03, 2008 7:08 pm Post subject: |
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| CheekyThomas wrote: | Nope it does the opposite.... the alloy brace expands quicker than the steel bearing and therefore it gets looser....
...keeping the case warm and fitting a cold bearing will make it very easy indeed, it will probably just drop in. |
but won't the alloy expand "into" the hole and not just outwards round the edge?
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CheekyThomas
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| Posted: Thu Apr 03, 2008 7:11 pm Post subject: |
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Trust me i do millions of them
It expands and therefore the machined place for the bearing gets bigger... its the same with crankbearings etc...
So no it wont expand into the hole...
Think of it like taking a photo of the swingarm... heating it is like then enlargening the picture by 0.01%. |
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Maver
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| Posted: Thu Apr 03, 2008 7:21 pm Post subject: |
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| CheekyThomas wrote: | Trust me i do millions of them
It expands and therefore the machined place for the bearing gets bigger... its the same with crankbearings etc...
So no it wont expand into the hole...
Think of it like taking a photo of the swingarm... heating it is like then enlargening the picture by 0.01%. |
i do trust you, and value your knowledge thomas
i'll be giving it a go soon......
heat, what we talking, hot air gun or in with the sunday roast???
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rainham boy
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| Posted: Thu Apr 03, 2008 7:41 pm Post subject: |
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a hot air gun will do as it don't need to be too hot
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CheekyThomas
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| Posted: Thu Apr 03, 2008 7:43 pm Post subject: |
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| At work i use a Paint stripping gun and just get it hot to the touch... when we raced RS125s i used to do the engine rebuilds at home in the evening and put the crankcases in a low oven... worked a treat |
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