Fix for rusty shaft ? Discuss

[Warlord]

Even if this drilling point is not in the optimum position, so long as it is left open when the bike is in use, any water will be forced forwards and backwards by acceleration and deceleration, and side to side by leaning into corners, so should find its way out.

If you fitted some sort of spigot, if that's the right word, permanently open and with a short rubber drain tube attached then it is very unlikely that water would get in by this route. However ingress of moist air, subsequently condensing on the inside surfaces when the bike cools, could be an issue.

Seems like this is something which BMW just haven't paid enough attention to.

But that's not the main issue... washing bike on centre stand will put water in the shaft housing. It'll just sit there once you put your bike back in the garage.... coating and rusting the shaft as you push your bike back and forth.

Yes a hole somewhere is better than no hole... but having it sited at a good static drain point would be better surely. Rather than having to rely on swishing it around hoping it hits the drain hole.

 

[Deleted account 191119001]

But that's not the main issue... washing bike on centre stand will put water in the shaft housing. It'll just sit there once you put your bike back in the garage.... coating and rusting the shaft as you push your bike back and forth.

Yes a hole somewhere is better than no hole... but having it sited at a good static drain point would be better surely. Rather than having to rely on swishing it around hoping it hits the drain hole.

Just thinking it might be worth buying an older crap swingarm for a few quid as a guinee pig first before drilling away at your own, just see see how strong the metal is etc, I would do it but am far from having the skill to decide how strong the metal would hold up, or not.

 

[Mr Bean]

washing bike on centre stand will put water in the shaft housing.

Hasn't on my LC and yes i did look at my previous 30k plus 63 plate.

Correct me if I'm wrong, but I seem to remember yours had a replacement swing arm and the dealer didn't apply any grease to seal the boot - which probably caused the puddle in the swing arm?

I use the correct grease (£20 for a little 50gm tube) which has the thickness of Sudocrem and is very sticky too - some are too tight to buy the right sealing grease; maybe that's causing some of the reported issues?

Maybe that's why I haven't suffered water ingress on recent bikes - I did on my hexhead where some numpty didn't fit the internal spreader clip and the joint snapped, locking the wheel.

 

[Deleted account 191119001]

Link to BMW oem paste if interested, name has changed simply

https://www.ebay.co.uk/itm/100g-Tub...875365&hash=item33e6ba21b2:g:fPMAAOSwB3JdN0OB

 

[Mr Bean]

Isn't that for the splines, rather than the sealing?

I have the Optimol too - very different to the correct sealing grease.

 

[Deleted account 191119001]

Isn't that for the splines, rather than the sealing?

I have the Optimol too - very different to the correct sealing grease.

Yep for splines sorry should have mentionned, for the gaitor below.

https://www.ebay.co.uk/itm/Staburag...917713?hash=item23c222d3d1:g:BPkAAOSwefldOdiB

 

[Mr Bean]

Yep for splines sorry should have mentionned, for the gaitor below.

https://www.ebay.co.uk/itm/Staburag...917713?hash=item23c222d3d1:g:BPkAAOSwefldOdiB

Yep, that's the stuff. About £20 for 50gm.

Some would rather spend a fiver on a 500gm tin of moly grease in the hope that it will job, rather than 25 times the price on the specified and researched product.

 

[Deleted account 191119001]

Yep, that's the stuff. About £20 for 50gm.

Some would rather spend a fiver on a 500gm tin of moly grease in the hope that it will job, rather than 25 times the price on the specified and researched product.

Yep and this is the actual OEM stuff BMW use for the gaitor sealing.

https://www.ebay.co.uk/itm/GENUINE-...091459?hash=item1cd3898d43:g:StEAAOSwDNRcr6BQ

Actual price of both items needed with part numbers oem BMW

Schmierstoff Staburags NBU 30 PTM 50G (07559056992) 18,71 €
Montagepaste 100G (18219062599) 13,90 €

https://www.leebmann24.de/

 

[Engineer]

But wouldn't you agree, water runs downwards.

The lowest standing point is where water pools.

So thats where the drain hole should be sited?

Errrr it will not necessarily pool at the lowest point, think about it - also the lowest point may not always be in the same place. I’m not surprised that I had to explain that to a non engineer

 

[Delboy777]

Errrr it will not necessarily pool at the lowest point, think about it - also the lowest point may not always be in the same place. I’m not surprised that I had to explain that to a non engineer

Ffs, heard it all now

 

[Engineer]

Ffs, heard it all now

Local maxima and minima.

 

[Deleted account 191119001]

Errrr it will not necessarily pool at the lowest point, think about it - also the lowest point may not always be in the same place. I’m not surprised that I had to explain that to a non engineer

Will do us a favour and do some studies on will the swingarm crack if drilled at some stage due to stress, that will help a lot.

 

[Warlord]

Errrr it will not necessarily pool at the lowest point, think about it - also the lowest point may not always be in the same place. I’m not surprised that I had to explain that to a non engineer

Ok, yes that makes sense, and in the R1200 shaft drive you are right, there are other pooling areas, but you just can't get to those.

i) Water pools by the Final Drive seal, rusting the sealing cap.

ii) Water pools in the rubber boot consatinered recesses.

iii) Water pools in the shaft housing, which then maintains the level on all other areas above.

So draining item iii above keeps the other areas at their lowest level.

As the shaft heats up, the heat will dry out the water quickly, rather than just slosh it around over and over...

 

[Engineer]

Now where do you actually drill the hole?, you will need at least two, one for when the bike is on the side stand and one for the centre stand position - then of course it will also depend on the suspension setting best to drill a bloody great big hole, about 50 mm did should do it but on the other-hand that might not be a great idea - I’ll let you figure out why.

 

[Deleted account 191119001]

Now where do you actually drill the hole?, you will need at least two, one for when the bike is on the side stand and one for the centre stand position - then of course it will also depend on the suspension setting best to drill a bloody great big hole, about 50 mm did should do it but on the other-hand that might not be a great idea - I’ll let you figure out why.

Right in the middle of the circle, as on sidestand it is perfect, and on centerstand also, only worry is will it weaken the swingarm, and if so will jbweld help to fix the problem of the hole..... or if the knobbly part with the grill on it is hollow, drill a hole through that, as surely the weld around it would help keep the swingarm more solid, would be brilliant if somebody had an old swingarm, and could drill through that knobbly bit.


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[Deleted account 250319001]

Just remove the whole swingarm ?

 

[beaver]

a small hole in the circle will be fine... JB weld will only block it up again?... 3 to 4 mm... perfect location for all stands and on the move

 

[Deleted account 191119001]

a small hole in the circle will be fine... JB weld will only block it up again?... 3 to 4 mm... perfect location for all stands and on the move

Nah mate I was thinking of a small threaded tube to put in the hole held in place by JBweld, that way it is sealed solid top and bottom, and a tiny screw with a rubber gasket to close hole at times.

 

[beaver]

why not scrap all that tube bit and just tap the hole... add screw with rubber washer if you like... same thing?

 

[Deleted account 191119001]

why not scrap all that tube bit and just tap the hole... add screw with rubber washer if you like... same thing?

Yep we agree on that same as the original video, was just thinking of making the swingarm more solid around the hole, as once a hole has been drilled, it might crack around the hole, maybe jbweld could avoid that, maybe overthinking.