Drive shaft splines.

[mikeyboy]

I don't doubt the shaft may seize, but does that matter ?

It does if you want to get it off.
I get that BWM may state it’s not a sliding joint.
But if it’s stuck solid and there no movement,any flex will put unnecessary load on,the prop trunnions,the bevel and gearbox bearings.
BMw may well be confident about the geometry of the para assy ,how about thermal expansion?
I’ve stripped a WC bevel,the unit is pretty well engineered.
Huge taper rollers throughout.
So if any loads are generated they will put the prop under a fair old bit of grief if there is no movement.
A prop that,up to now,with the research I’ve done,is not repairable.
Bumw have sourced/commissioned uj trunnions that are not commercially available.
So a worn prop uj is a complete new assembly,instead of a couple of hundred to refurb.

 

[Deleted account 250319001]

You've listed several problems, thermal expansion ? No movement etc etc
Show me where the problems are ? Where are the issues posted on here due to a seized drive shaft spline ?
Why would I want to get it off ?

 

[mikeyboy]

As a by the by,
Air head prop trunnions are 44.5 x 19.
Hex head 48x 19
Iirc the wp is 52x 19
None of them are over engineered given the torque going through them.
I’d put good money on a van steering column having bigger uj’s .
Let alone pushing a1/4 tonne motorcycle to 130 mph

 

[mikeyboy]

You've listed several problems, thermal expansion ? No movement etc etc
Show me where the problems are ? Where are the issues posted on here due to a seized drive shaft spline ?
Why would I want to get it off ?

Carry on my good man.
I’ll bow to your superior knowledge.

 

[Deleted account 250319001]

Where's the evidence that they fail ?

 

[mrtee43]

Stop press, BMW says that shaft drive is maintenance free and paralever keeps drive shaft same length, no spline sliding.
https://www.bmwmotorcycles.com/en/d...detail/motor-drivetrain/paralever-cardan.html

That's as maybe, BUT what are you going to do when you want to pivot down the final drive or remove it, for whatever reason, and you can't because your super quality( not) ungreased shaft/ final drive spline set has corroded and grown together so it is impossible to separate. Put that scenario against spending, what, say 20 minutes with a bit of maintenance and applying a bit of grease.

 

[Deleted account 250319001]

Carry on my good man.
I’ll bow to your superior knowledge.

I'm simply stating a seized drive shaft spline is not an issue. Superfluous worrying.

 

[Deleted account 250319001]

That's as maybe, BUT what are you going to do when you want to pivot down the final drive or remove it, for whatever reason, and you can't because your super quality( not) ungreased shaft/ final drive spline set has corroded and grown together so it is impossible to separate. Put that scenario against spending, what, say 20 minutes with a bit of maintenance and applying a bit of grease.

you dont need to

 

[Deleted account 250319001]

Bottom line is this, I understand how it may be a mental thing and its nice knowing they are greased, that's fine... I get that.
But don't post on here that if you don't do it your shaft is going to explode. That simply isn't true. Do it for your own reasons. Not fiction.

 

[Mr Bean]

Where's the evidence that they fail ?

Ok, with a hexhead, but the rear joint on my bike catastrophically failed locking the wheel, punting me in the path of a 40' artic.

If, I had checked beneath the gaiter I'd have spotted the issue.

Apart from changing side I can't see a difference in the waterproofing.

 

[Deleted account 250319001]

Ok, with a hexhead, but the rear joint on my bike catastrophically failed locking the wheel, punting me in the path of a 40' artic.

If, I had checked beneath the gaiter I'd have spotted the issue.

Apart from changing side I can't see a difference in the waterproofing.

The rear joint ? what part is that ? I chose not to buy a 1200 and kept my 1150 for 14 years because of all the final drives that failed.

I've stated previously, of course any mechanical part can and will fail. But in prospective.

 

[Mr Bean]

The rear joint ? what part is that ?

I've stated previously, of course any mechanical part can and will fail. But in prospective.

The one with spines

 

[Deleted account 250319001]

The one with spines

so not an LC and not the spines ?

 

[ianm00]

Bottom line is this, I understand how it may be a mental thing and its nice knowing they are greased, that's fine... I get that.
But don't post on here that if you don't do it your shaft is going to explode. That simply isn't true. Do it for your own reasons. Not fiction.

I cant see anyone on this thread mentioning "exploding shafts" apart from yourself. If others want to perform preventive maintenance that is upto them. I dont understand why you are so against anyone that decides to do this to their bike. You dont do it others do so what?

 

[Deleted account 250319001]

I cant see anyone on this thread mentioning "exploding shafts" apart from yourself. If others want to perform preventive maintenance that is upto them. I dont understand why you are so against anyone that decides to do this to their bike. You dont do it others do so what?

Quite right.
The reason i react is because the posts claiming the shaft spline is going to fail or cause the bike to fail is not true. And continuously posting it is true on here is ...... bollox. Hope that answers your question.

 

[mrtee43]

you dont need to

Your rubber boot is shot and needs replacing or do you just ignore it?

 

[Mr Bean]

so not an LC and not the spines ?

Same design as far as I can see - just on the other side.

My point is, that if I had looked behind the gaiter I'd have seen the problem. The issue is that I didn't, as it wasn't in the service schedule.

A locked wheel at 50mph on a wet M25 is enough is enough for me to have a look-see.

Your call...

 

[Deleted account 250319001]

Your rubber boot is shot and needs replacing or do you just ignore it?

In my experience, 8 GS;s 23 years, never had a boot needed changing.

So now we need to strip the spines just in case the rubber boot is damaged

 

[mrtee43]

In my experience, 8 GS;s 23 years, never had a boot needed changing.

So now we need to strip the spines just in case the rubber boot is damaged

Why do BMW in their infinite wisdom, put a rubber boot where they do. Tell me the reason.

 

[Deleted account 250319001]

Why do BMW in their infinite wisdom, put a rubber boot where they do. Tell me the reason.

That's a nonsense question.