Help needed on rear hub bearings

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Nic
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Sun Mar 14, 2010 7:25 pm

Anyone with a set of Verniers who can measure up a new RIV rear hub bearing they might have lying around? Also need measurements for a Casa one and an MBD Race-Tour one. All at standard rom temperature, if possible.

Reason being is that I'm getting a leak at the rear hub and it's definitely the bearing. Have already tried to re-seat the existing (Casa) bearing using standard Loctite, without much luck. I have now got hold of some thicker Loctite and will also be replacing the layshaft O-ring.

But I'm also hoping the tolerances for each different gearing might be very slightly different, in which case I'll be ordering the one with the tightest potential fit.

Many thanks...

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sean brady scooters
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Sun Mar 14, 2010 7:36 pm

unless the bearing was a real loose/sloppy fit into maybe worn casings,I would first suspect the seal and o ring as you say.........
another think to maybe check is your breather......it could be blocked and pressurising the crankcase....and so forcing oil out where it would not normally go.......
but anyway i,ll check out some bearing sizes for you.
Sean Brady Scooters - 01765 690 698

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sean brady scooters
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Sun Mar 14, 2010 8:03 pm

ok matey, i,ve just measured about 20 different ones of various makes.....
most are 51.97/51.98........
however, the NBC india one was the biggest at 52.06...........

RIV....51.97
nachi....51.98
GF..........51.98
NBC india........52.06
JBL india ....51.99
Sean Brady Scooters - 01765 690 698

Nic
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Sun Mar 14, 2010 8:05 pm

sean brady scooters wrote:unless the bearing was a real loose/sloppy fit into maybe worn casings,I would first suspect the seal and o ring as you say.........
another think to maybe check is your breather......it could be blocked and pressurising the crankcase....and so forcing oil out where it would not normally go.......
but anyway i,ll check out some bearing sizes for you.
Cheers Sean, you're a star.

The seal is only a couple of months old. I might have fitted it wrong, but it's not one of those you can cock up easily, like a crank or kickstart one. Checking the breather is a cracking suggestion, hadn't thought of that.

I strongly suspect the casing IS worn, as you say. Measuring different bearing sizes is just an added bit of insurance in the hope that if there is a tiny, tiny difference it might help a bit.

Any idea what the two Indian ones are like, especially the NBC India?

Again, many thanks.

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RinB
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Sun Mar 14, 2010 8:36 pm

Nic PM sent
If its made of Metal Fettle it !!

shocky
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Sun Mar 14, 2010 9:20 pm

http://www.archerengineering.com.au/retaining.htm
have u tried something like this iv not used it on a lammy but on one of these
when i worked for BAE
http://en.wikipedia.org/wiki/FV432
We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm

Nic
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Sun Mar 14, 2010 9:35 pm

shocky wrote:http://www.archerengineering.com.au/retaining.htm
have u tried something like this iv not used it on a lammy but on one of these
when i worked for BAE
http://en.wikipedia.org/wiki/FV432
No I haven't, thanks for the tip....

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dapper
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Mon Mar 15, 2010 11:27 am

These photos might help. Copy and paste somewhere ;) :D
Image

Image
Compact Toolbox Flywheel Holder

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sean brady scooters
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Mon Mar 15, 2010 1:31 pm

dont know where you got those 54mm measurements from........ :shock:
Sean Brady Scooters - 01765 690 698

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dapper
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Mon Mar 15, 2010 1:34 pm

Don't blame the messenger Sean. Just something I copied from another thread a while ago and thought useful!!
Compact Toolbox Flywheel Holder

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