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Post by baz69 on Nov 12, 2019 20:38:15 GMT 1
Evening all,have a strange one ,just starting to refurbish my 4l0 wheels ,going to replace bearings ,both bearings in rear wheel were tight but needed replacement,when I removed the bearing on brake shoe side it came out with a small piece of tin around outer circumference of bearing to hold it in tight,placed bearing in without tin piece and sure enough it's loose ,it's correct bearing have new skf bearings ,so tried the new one and its same ,has anyone come across this problem and what would cause the inner diameter of the wheel to lose its manufactured width,it seems perfectly round in diameter just increased in diameter,completely stumped by this.just measured the piece of tin its width is quite small 0.40mm,and can reuse it with new bearing seems like it will be a tight fit ,
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Post by stusco on Nov 12, 2019 21:02:43 GMT 1
I think it’s quite common I’ve got a mate that races twin shock motorcross I’m sure every bearing on his Maico has a bit of coke can round them,but you can’t get parts for them,you could always get another wheel if your not happy
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Post by shaunthe2nd on Nov 12, 2019 22:12:41 GMT 1
Use diet coke tin to save on the sugar tax!
Seriously I've not come across this and would be as worried as you are.
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Post by headcoats on Nov 12, 2019 22:33:46 GMT 1
It can happen when wheels are blasted for powdercoating etc and fecks the size up where the bearings fits
Have heard where folks dimpled all the inside of the bearing surface then applied bearing lock on outer surface of the bearing !!!
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Post by JonW on Nov 12, 2019 22:57:03 GMT 1
Yes you can use a punch to give a bunch of raised areas that will hols a bearing and many bikes are fine like that. having a shim like on this wheel is the next level.
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Post by cb250g5 on Nov 12, 2019 23:11:48 GMT 1
My DR5650 seized and then spun the sprocket carrier bearing. The replacement was a bit loose...
It's called bearing shim, not coke can, but the effect is the same.
Just make sure it's central(ish) when done, it'll be fine
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Post by headcoats on Nov 12, 2019 23:55:37 GMT 1
Would the wheel have to be machined for the shim though , as it would have to be paper thin ?
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Post by baz69 on Nov 13, 2019 1:12:25 GMT 1
ok so from what I can figure out wheels have never been powdercoated they look original I have replaced every bearing from steering to swingarm and now wheels ,all bearings were original koyo or were replaced with original somewhere along its life ,except that side on rear wheel was aftermarket ,but why would there be so much play in that side that you would need to shim it when bike from what I can see is completely std ,and all bearings were in fact in good condition just as a matter of course I decided to replace as i am going to refurb wheels.
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Post by JonW on Nov 13, 2019 1:21:23 GMT 1
I reckon you either need to trust the tin shim you have (cos it fits) or get another wheel. You could have this one cut back to a larger bearing size or something at a machine shop, but another wheel is easier and they are not that hard to find, probably cheaper too.
0.4mm of shim means the hole is 0.8mm 'baggy'. Thats a lot of movement and seems like someone had it cut back on a lathe to accept the bearing and the shim. I doubt it could have worn itself that much without killing someone lol
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Post by cb250g5 on Nov 13, 2019 12:47:20 GMT 1
On my DR, the seized bearing wore the hole noticeably bigger very quickly. Steel bearing not rotating in aluminium carrier...
I can't remember how big shim I needed, but it's available in a variety of sizes.
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Post by oldelsieboy on Nov 13, 2019 12:54:14 GMT 1
Evening all,have a strange one ,just starting to refurbish my 4l0 wheels ,going to replace bearings ,both bearings in rear wheel were tight but needed replacement,when I removed the bearing on brake shoe side it came out with a small piece of tin around outer circumference of bearing to hold it in tight,placed bearing in without tin piece and sure enough it's loose ,it's correct bearing have new skf bearings ,so tried the new one and its same ,has anyone come across this problem and what would cause the inner diameter of the wheel to lose its manufactured width,it seems perfectly round in diameter just increased in diameter,completely stumped by this.just measured the piece of tin its width is quite small 0.40mm,and can reuse it with new bearing seems like it will be a tight fit , The code of the brake side bearing is 6302 which is 42mm O/A diameter. It is possible to buy a bearing that is 1mm larger, 43mm diameter, might be worth a measure to see if it would fit. simplybearings.co.uk/shop/advanced_search_result.php?keywords1=15&keywords2=43&keywords3=13OEB |
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Post by baz69 on Nov 13, 2019 13:23:04 GMT 1
Yeah ,thanks oldelsieboy,I am going to bring wheel and bearing over to a bearing supplier to see what's available.
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