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Hi All.

Need some help here: LHS swingarm bearing is wobbly.

I've searched around the net and seen references to worn or loose tapered roller bearings in the swingarm pivot, and also references to pivot bolts.

So last night I pulled out the RHS pivot bolt for a look-see at how things fit.

For the life of me I couldn't see how there is space for a roller bearing within the swingarm boss on that side, and nor was there anything that looked like an adjuster.

Can anyone help me get my head around this pls?

Before U ask, I don't have the big socket needed for the LHS nut and all the shops are closed today.

Thanks.

viewtopic.php?p=139656&sid=1111be6276ae ... 9f49693461

Drawing posted during above conversations should help.

Cheers and good luck.

Corvus wrote:http://www.boxertrix.com/phpBB2/viewtopic.php?p=139656&sid=1111be6276aee14c919b4c9f49693461

Drawing posted during above conversations should help.

Cheers and good luck.

Well it does - sort of - although I have seen that earlier.

It's bearing(s) 5 I'm talking about, but what I don't get is the purpose of stud bolt 8 and lock nut 9. (those at the swingarm pivot). Why not just use the same arrangement as on the RHS unless they serve a pre-load function?

Up till now I had the idea that (5) were tapered roller and so needed pre-loading, but reading that conversation there is a mention they are needle roller, which is making less sense.

HerrFlick wrote:

Corvus wrote:http://www.boxertrix.com/phpBB2/viewtopic.php?p=139656&sid=1111be6276aee14c919b4c9f49693461

Drawing posted during above conversations should help.

Cheers and good luck.

Well it does - sort of - although I have seen that earlier.

It's bearing(s) 5 I'm talking about, but what I don't get is the purpose of stud bolt 8 and lock nut 9. (those at the swingarm pivot). Why not just use the same arrangement as on the RHS unless they serve a pre-load function?

Up till now I had the idea that (5) were tapered roller and so needed pre-loading, but reading that conversation there is a mention they are needle roller, which is making less sense.

I've never stripped this part of this machine, but I'd say item 5 are taper roller bearings, opposed and adjusted by the "stud" and locknut on the LHS. This is purely my interpretation from looking at the drawing.

Speak to them at Munich Motorcycles.
http://www2.munichmotorcycles.com.au/pr ... ts_id=5533

As Corvus suggests , item 5 is taper roller hopefully not as well lubricated as mine..
viewtopic.php?t=16148&highlight=bevel+box

nab 301 wrote:As Corvus suggests , item 5 is taper roller hopefully not as well lubricated as mine..
viewtopic.php?t=16148&highlight=bevel+box

Aaaaah! All becomes clear.

Hope my LH bearing is not looking like that either.

Thanks Nigel.

Cheers nab301.

Next observation then, is that, in an opposed taper roller setup like this, the clearance will be shared out both sides. In reality though, the load won't be even, so maybe that's why you're only feeling it one side?

Mainly, I guess, you'd need to remove at least the wheel and shock to get a truer feel for the total amount of play.

I notice that the items on the Mitch1100 link have grease nipples and are plain bearings, not rolling element type.

Corvus wrote:Cheers nab301.


I notice that the items on the Mitch1100 link have grease nipples and are plain bearings, not rolling element type.

Correct , although they're for the bevel box .

As to you other comment
I couldn't detect the play in the swing arm until the bevel box , paralever arm and shock had been removed.

nab 301 wrote:

Corvus wrote:Cheers nab301.


I notice that the items on the Mitch1100 link have grease nipples and are plain bearings, not rolling element type.

Correct , although they're for the bevel box .

As to you other comment
I couldn't detect the play in the swing arm until the bevel box , paralever arm and shock had been removed.

Thanks again.

Is it fair to say then, that it could be either bearing, or both, which is worn? The "play" would just make itself felt at one side or another due to lopsided static weight/leverage of the components you describe.

Because the bearings are opposing each other, adjusted against each other, without stripping down would it be possible to judge which is duff?

Corvus wrote:

nab 301 wrote:

Corvus wrote:Cheers nab301.


.

.

Thanks again.

Is it fair to say then, that it could be either bearing, or both, which is worn? The "play" would just make itself felt at one side or another due to lopsided static weight/leverage of the components you describe.

Because the bearings are opposing each other, adjusted against each other, without stripping down would it be possible to judge which is duff?

Unfortunately I had neither the time nor the intellect to figure it out but my local disenfranchised dealer had a set in stock at the time and I had the ability to replace them for which I am very grateful..

nab 301 wrote:

Corvus wrote:

nab 301 wrote: .

Thanks again.

Is it fair to say then, that it could be either bearing, or both, which is worn? The "play" would just make itself felt at one side or another due to lopsided static weight/leverage of the components you describe.

Because the bearings are opposing each other, adjusted against each other, without stripping down would it be possible to judge which is duff?

Unfortunately I had neither the time nor the intellect to figure it out but my local disenfranchised dealer had a set in stock at the time and I had the ability to replace them for which I am very grateful..

I suspect it's nothing to do with your intellect and everything to do with my inability to express myself clearly.

Out of interest, what clearance did you adjust the two taper roller bearings to?

Out of interest, what clearance did you adjust the two taper roller bearings to?

I guess I'm more of a fitter than a thinker , I just followed the instructions in the OE shop manual . Fixed journal torques to 9Nm and floating l/h to 7Nm ,locknut to 160 Nm . Checked there was no play and it was swinging ok , never looked back since
I'm sure I read here later on that the floating journal is assembled and over torqued , loosened and retorqued to the above values?

nab 301 wrote:

Out of interest, what clearance did you adjust the two taper roller bearings to?

I guess I'm more of a fitter than a thinker , I just followed the instructions in the OE shop manual . Fixed journal torques to 9Nm and floating l/h to 7Nm ,locknut to 160 Nm . Checked there was no play and it was swinging ok , never looked back since
I'm sure I read here later on that the floating journal is assembled and over torqued , loosened and retorqued to the above values?

Two taper roller bearings, adjusted against each other so that all clearance is removed and there is a small amount of preload?

Corvus wrote:Is it fair to say then, that it could be either bearing, or both, which is worn? The "play" would just make itself felt at one side or another due to lopsided static weight/leverage of the components you describe.

Because the bearings are opposing each other, adjusted against each other, without stripping down would it be possible to judge which is duff?

Wear takes place on both sides, the final drive/bevel can move from side to side on the pivot pins.. In over 20 years of working on BMW's i've never seen just the one bearing worn.