Leaking rear hub rearing - any solutions?

[Nic]

After a near-death experience when my rear brake stopped working completely - I'd had problems with it for ages already - the hub came off (again) to find the brake shoes covered in oil. The rear hub bearing (an almost new Casa one which has only done 350 miles) is so slack that it came out with barely a tap from the inside.

I've re-fitted it using Loctite 641 and rebuilt the bottom end yesterday. Unless the brake fades completely again, I'm going to leave the hub for a hundred miles or so and see what gives then. Anything else I could/should so if it does? Is it worth replacing the Casa bearing for another type?

Also, someone mentioned Loctite 620: anyone tried it?

Any ideas, suggestions gratefully accepted. Many thanks....

[cezeta]

620=

Retaining compound is used when press or slip fitting cylindrical components that are not threaded. It fills the gaps between parts, creating a rock solid connection. 609 formula is an all purpose, quick curing compound that is perfect for general press fit applications for gaps up to .005" that will not be exposed to excessive heat. 620 is a high heat slip fit formula that will withstand temperatures of up to 450 F and fill gaps up to .015" while sealing the metal and preventing corrosion. 638 is a super heavy duty compound for use in high stress applications, for slip fit applications of up to .010". For more technical information on 609 Rataining Compound please view the

i have used this at work, it dries to like a resin finish and needs to be heated to get it out again. we use it with the activator spray so it goes off quicker and does not run away.

hasnt mbd got an uprated rear hub bearing?? I would prefer british to italian parts given a choice specially with bearings seals or anything electrical.

can you tell if its the casing thats worn or the bearing thats a bit undersized?

[Nic]

Hi Nick, I've heard many people say that Casa rear hub bearings are not as good as the original ones.

In this case, I wonder if it's the bearing that is undersized, more likely to be the casing that's worn, unfortunately. Any experiences?

I should have taken out the verniers and measured the two but I suspect I wouldn't have noticed any difference as the tolerances are likely to be in the .0000s.?

Yeah, I've just looked up the MBD bearing and also both Rich Presley and Cambridge sell a RIV one which they claim is better quality than the Casa one. Anyone with a view on either? I suspect it's less the fit than the quality of the bearings in the cage that tells them apart. But if anyone had a loose Casa rear hub bearing they cured by fitting a RIV/MBD one, feel free to get in touch.

Also realised afterwards that I didn't check the O-ring on the layshaft before refitting.... Just hope the problem's sorted or else I'll have to start all over again.

Any more similar experiences, tips or advice always welcome.

[jimmers]

hey nic

i purchased a riv of rich pres

good quality and was a good fit to casing, and seal fitted nicely

cheers buddy

[rog60]

Just a point of interest. Casa Lambretta UK (Scootopia) appear to be selling RIV rear bearings. Could they be trying to say something.

[ArmandTanzarian]

remember that a new bearing and seal wont make any difference if the O ring on the layshaft has had it. Unfortunately, replacing it is a pig of a job