Rear Wheel Play

[wswartzwel]

Glad you are back rolling Erric, I am back home now, and looking at the tech manual for the pic you were referring to on the phone. Not much to go by.... I found this one, which doesn't really give a good perspective.
The second image is correct.

BTW where did you get my number??? Flattbutts wall??? Nice to talking to you.




This picture from the parts fiche is correct.

[ErricZ]

Yup, those were my exact two dilemma-inducing, photo diagrams.

You'd be surprised what's written on his walls. (Hope it wasn't a bother. )

[wswartzwel]

No bother at all. Glad to help.

[jgrm1]

How much play in these final drive to Paralever bearings is too much when grabbing the rear wheel at 6 & 9?

I have the "tick-tock" as someone eloquently described it, but since these are tapered bearings, I would expect some play. Even when adjusting front wheel bearings on my F-150 pick-em-up truck to spec there is some play.

How do you know when it is time to adjust/replace these babies?

-Jeff

[roger albert]

If you feel play, _any_, then they are loose.

[ErricZ]

Yes, the manual is very adamant about ZERO PLAY.

[gigantic]

as is my wife...

[Dale Flowers]

[i]Originally posted by ErricZ
Sucks paying $35 a bearing for something that small. I'll have to hit up the place we have locally next time -- in advance, of course. [/B]

Last time I did the pivot brgs. they were not a standard size and therefore available only through BMW at their prices. Anyone know otherwise? I'm due again soon.

[roger albert]

pretty odd size/aspect-ratio.
No luck on alternate sources so far, despite a lot of digging.

[ErricZ]

I should have verified the size on the outer race, but is the size listed on the fiche correct and enough to search on? (10x32x17)?

(I also performed the Cam Chain Tensioner Update ... MAN, what a difference in that start-up clack, GONE! )

[Flatbutt1]

Originally posted by ErricZ

(I also performed the Cam Chain Tensioner Update ... MAN, what a difference in that start-up clack, GONE! )

you DID remember how many parts are in the kit this time...right? man I thought I had lost my mind on that one Rev!

[ErricZ]

Yes I did! I confused the guys (and gals) at CCBMW yet again with that one! It sure was much easier this time around after trying it out on your bike 1st.

BTW, I was asked this my the bearing guys, anyone have an answer for it?

"What type of needle bearing? Do needles ride directly on shaft? Is the outside of bearing stamped steel?
( Drawn cup)> Drawn cup is normal for most japanese bikes. "

[wswartzwel]

Originally posted by ErricZ


BTW, I was asked this my the bearing guys, anyone have an answer for it?

"What type of needle bearing? Do needles ride directly on shaft? Is the outside of bearing stamped steel?
( Drawn cup)> Drawn cup is normal for most japanese bikes. "

Tapered/Caged roller bearing with inner and outer races. Similar to auto/trailer wheel bearings.

[ErricZ]

I'll see if that helps! I told him there's a possible group buy involved if they are a good $$ for a bunch of sets of 4.

[JonyRR]

Do any of youze guyz remember that there's a guy at rubber chicken racing that makes these out of oillite bronze?
Way more load tolerance.
When (that's the bad part, there WILL be a 'when' AGAIN on a shaft-driv e bike) I do this again I'm going oillite bronze bush.
A better design for this particular application than a tapered roller.

[Flatbutt1]

Originally posted by JonyRR
Do any of youze guyz remember that there's a guy at rubber chicken racing that makes these out of oillite bronze?
Way more load tolerance.
When (that's the bad part, there WILL be a 'when' AGAIN on a shaft-driv e bike) I do this again I'm going oillite bronze bush.
A better design for this particular application than a tapered roller.

group buy?

[wswartzwel]

How does bronze compare in rolling resistance, under load? Will it deform under pressure? The pivot bearings take a pretty good pounding with every bump.

Also the bearings are tapered for lateral as well as axial loading. How are the bronze bushing made... Tapered as well?

[JonyRR]

Yes, they're tapered like the original design, just oillite bronze.
I've had severeal bearing folks tell me that tapered roller bearings in this particular usage is a misapplication of technology as the tapered roller bearing is designed for a continual rotating action with loading thru the 'roll center' of the bearing roller.
the swingarm moves only a small amount, the same wear surface is exposed to load with no rotation of the rollers into a new position, thus just a few rollers take the major brunt of a straight-thrust impact.
made sense to me.

[wswartzwel]

Originally posted by JonyRR
Yes, they're tapered like the original design, just oillite bronze.
I've had severeal bearing folks tell me that tapered roller bearings in this particular usage is a misapplication of technology as the tapered roller bearing is designed for a continual rotating action with loading thru the 'roll center' of the bearing roller.
the swingarm moves only a small amount, the same wear surface is exposed to load with no rotation of the rollers into a new position, thus just a few rollers take the major brunt of a straight-thrust impact.
made sense to me.

Hmm need to add to the periodic maintenance, disassemble and rotate my pivot bearings every 3,000 miles...




Found THIS online, but am hesitant to try a substitute due to the catastrophic results if these bearings were to let go. Tends to muck up the rear of the bike from the pics I have seen online. would like to find out more about the "oilites" though Jony, is there a website???

[JonyRR]

this is the dude, post him directly...
http://www.rubberchickenracinggarage.com/