I removed my rear shock for a service .First time i have done this .Got skock out ok but also got all the roller pins falling out all over the place .
Am i right in thinking if they have fallen out of the cage they are stuffed and new bearings needed ?
It looks like 6 bearings in total , are the ones in the bottom of the swing arm the same size as the dog bone looking ones ?
Are they a bearing shop type ,please say yes any good bearing shop .
Thanks
No the pins that fell out aren't necessarily stuffed. I would suggest a lack of grease has caused them to all fall out. It is pretty well essential to get them ALL back in.
As to whether they are all the same size I honestly don't know, but I'm sure Dave at MotoItalia can confirm/supply the necessary items for you, if you call/PM oe email him.
Hoh, Hum, another shitty day in paradise!
The needle roller bearings at either end of the dog bone are the same AP number, not sure which ones you mean by "the ones in the bottom of the swing arm". If you mean the ones that swing arm pivots on, then no, they are not the same as AP number is different.
The AP Schematic shows a caged needle roller bearing. The purpose of the cage, amongst other things, is to retain the needle rollers. So I'd suggest that if the needles are falling out, the caged needle roller bearing is fucked.
Yes the ones in the bottom of the swingarm are the same. You should be fine cleaning yours up and regressing. Just make sure you have not lost any needles. I have some spare needles if you need them. From memory, they take 29 per cage, but you better check this.
Well im in trouble as i 've lost about 6 .Fell through floor boards .I have to say i'd like to replace them 70,000 kls .
If these are looking a bit dodgy what mileage do swing arm bearings get ? I thinking these must be ready for a change as well .
Last edited by tasi; 05-13-2012 at 06:05 AM.
They will get looser even if well maintained. They come out of the factory with too little grease. Another thing is the case hardened bushing in the left of the swingarm. It grooves up after 20-30k miles. Don't replace it, just reinstall it upside down! I bought the replacement cages and seals from simplybearings.co.uk. much cheaper than Aprilia.
Asked my partner to go to the local bearing shop to ask if they stocked them .She came back with 6 new ones .Oh well saves me making the replace or not decision .$80
for 6 .
Originally Posted by tasi
Hoh, Hum, another shitty day in paradise!
The old bearings are loose sitting in a a cage lets say 30 rollers .
The new bearings are not loose but sit in a cage that sits in a cage .15 rollers .
They both seem to fit the shaft the same .Snug .
I'm hoping just different brand of bearing and can use the new ones .
Any thoughts ?
The old rollers -Half seem to be shinny ,half black .Is this two differant metals so the dont wear against each other .So they sit in the cage black-shinny-black -shinny .
This is getting complicated .(and annoying )
Last edited by tasi; 05-14-2012 at 05:14 AM.
So the number of needle rollers has halved??? Yeah? This, being the case, is bad. In the application of suspension linkage, the load is considered static from a design point of few (not spinning at speed, just oscillating), so the number of needles in the load zone is very important. In any given load condition, the load zone of your new bearings will have nominally half the number of needles to cope with the load applied = a nominally doubling of the surface pressure between needle and load surface = drastically reduced life of needle roller bearing and its mating components (shaft and inner bore).
They are just corroded or otherwise damaged. New they are all the same. As Nonno stated, caged rollers will not hold up well. You want the full compliment bearings like the originals.
Bearings are my gig, and whether they be "standard caged needle rollers" or "full compliment caged needle rollers", the cage should hold them in place. In high speed rotational applications (dynamic load), they normally have some sort of spacer in the cage to keep the rollers from "running over" each other and locking up.
In suspension applications (static load) full compliment is the go because it's all about load capacity in a shock sense (not as in the spring thing at the swing arm by the way, but shock as in "surprise" or "sudden" loading). Either way though, the cage should keep the needle rollers in situ. This is, if for no other reason, a requirement of mass assembly of the motorcycle, eg. you can't be assembling by trying to hold needle rollers in place with grease and what have you, you need to be able to pick up a caged needle roller bearing and push it into place, job done.
The fact is, the bearings fitted in our mass produced aprilia's do not have a cage. They are and always have been full compliment needle bearings with no cage.
I'll take your word, I've no idea, other then to say the AP schematic shows a caged item (and tasi mentions a cage in regard to his f%6ked one, is there a variation on some models)?
No, there is no variation. All Mille, RSVR, Tuono, Falco, Futura, etc. V60 equipped bikes have always had full compliment bearings in the suspension linkage and that's what you get if you buy oem parts.
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