Needle roller bearing size in primary cover

A

Aroundtoit

New member
Greetings
I want to get bearings for a jota primary cover
The 2 stuck in cover
Don't have them out but want to order
Before I get there
Anyone know off top of head what they are?

Cheers
 
Aroundtoit, laverdamania.net is a site run by Jean-Louis Olive, a very knowledgeable Frenchman living in the Caribbean, also a hell of a nice guy. The site is in English , German and French, but a lot of it's French only, although not too hard to work out. http://www.laverdamania.net/roulementgb.htm is a listing of all bearings for triples. But do surf the site, JLO does update it fairly often and there's usually something new there whenever I visit.

Ken
 
buy them online from Simply bearings and pay only ?1.50 postage
you will need an extractor, preferably the factory supplied one, and refitting is best done in a press with a shaped wooden block for the primary cover to rest on, although that is desirable (the press I mean) not essential.Removing the inner sleeve from the crank does need a lot of care and attention, it needs to be ground away using, well a grinder! of some sort, but dont grind the crank, just cut the needle bearing inner untill its paper thin(changes colour) then do the same on the other side at 180 degrees and it will pop off.
CLEM
 
Hi
Got the sizes thanks
I didn't realise the inner was on the crank
Better be careful!!
Didn't get much luck sourcing bearings today
In perth but will try more in depth
Tomorrow, also will need to get a puller
Maybe get the lot from Germany  or uk

Always more to the job once you start!!
 
Go to your local engineering tool shop and ask for a blind bearing puller, or have a look for one on ebay, or borrow one.

The bearing outer races are an interference fit in the primary cover, but they're also held in by a punched crimp in the edge of the aluminium housing, usually in 3 spots. When you pull the bearing out, a little piece of the peened edge may come away with it. No big deal, just re-punch in a different spot around the edge after you'be pressed the new bearing in.

The bearings aren't unusual or rare. Your bearing supplier shouldn't have too much trouble finding them. I bought some a couple of years ago from a bearing shop here in Tassie. They had them on the shelf.

Cam
 
primary cover bearings are a common size, if your bearing shop in WA cannot find them, change bearing shops first
if still no luck, I'll send them to you from here in Brisbane, would have at least 24 of each size in stock at the moment

 
Got bearings on order and was looking at
Posts regarding removal of old ones
Options so far are to make a tool
Or try putting it in oven to heat it all up
Worth a shot I guess , I can't find a small internal
Puller off shelf yet 
Any tips??
 
Pretty sure I have a set of blind bearing pullers in the man cave. I'll have a look at noon and get back to you. My shed will be a bit closer than Tassie.
 
Yep, I have a set. I'll be home all day Sunday, well from mid morning anyway as I intend to get out for a ride early, so if you want to bring it over it can be sorted. I'll send my address by email.

Dave
 
I got mine out of the outer case by heating in the oven to 250c and then tapping the cover (gasket face down) on a piece of soft wood. They just dropped out. You can use a heat gun too. For the bearing inner race still on the end of the crank case, I wrapped a rag behind it and used a 1.5mm x 100mm angle grinder disc in the angle grinder to make a cut. It is easy to do without cutting the shaft if you go slowly.
OR you can spend more money on tools.
It all works.
Good luck
 
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