r1200gs final drive rebuild.

[DrFarkoff]

Well Talk about a wee un waiting their sweeties

Mines made it from a young fellers workshop (£5 there Mikeyboy ) and I missed the parcelfarce twat "but" had sense to leave a note to ask him to please leave it in the post office

So my sweeties are outta range till tomorrow

looking forward to fitting Gerties FD and getting her MOT'd and down to the Hubb Ireland meet

 

[Bendy toy]

As I understand it, the 1150 crown wheel had a deep groove ball bearing (as does the 1200) with a taper roller on the inside. The 1200 has a roller bearing on the inside. Bikes have minimal side forces, but it seems odd to me for the designers to reduce the lateral strength of the unit.

There is a thread on Adv Rider where a guy's 1150 wheel bearing kept failing on a long tour through South America. He eventually fitted an angular contact ball bearing in place of the deep groove and the FD was fine thereafter. Funnily enough the old BL Mini front wheel bearings also had taper roller and angular contact ball bearings. They never failed even in heavily modded cars.

My FD (drain plug type) is running with 200ml measured from the gauge on the side of the bottle, so with whatever oil left over inside, its def got more than 200ml. There have been no leaks (yet) and the vibration (that I can't track down) is unchanged. The chances are its not the FD, but Ive not yet proved it.

 

[patzx12]

As I understand it, the 1150 crown wheel had a deep groove ball bearing (as does the 1200) with a taper roller on the inside. The 1200 has a roller bearing on the inside. Bikes have minimal side forces, but it seems odd to me for the designers to reduce the lateral strength of the unit.

There is a thread on Adv Rider where a guy's 1150 wheel bearing kept failing on a long tour through South America. He eventually fitted an angular contact ball bearing in place of the deep groove and the FD was fine thereafter. Funnily enough the old BL Mini front wheel bearings also had taper roller and angular contact ball bearings. They never failed even in heavily modded cars.

My FD (drain plug type) is running with 200ml measured from the gauge on the side of the bottle, so with whatever oil left over inside, its def got more than 200ml. There have been no leaks (yet) and the vibration (that I can't track down) is unchanged. The chances are its not the FD, but Ive not yet proved it.

I believe this is a fundamental issue, no proper thrust bearing. BMW are asking a roller bearing (6013) to take the thrust forces, replacing this bearing with a thrust type of bearing could be good.

 

[mikeyboy]

I believe this is a fundamental issue, no proper thrust bearing. BMW are asking a roller bearing (6013) to take the thrust forces, replacing this bearing with a thrust type of bearing could be good.

while i see the point being made here.if we take a look at bikes in general ,none of them have any type of thrust bearing on the wheels,a bike does not have side forces acting on the wheels(unless a side car is fitted).
all of the "wheel bearing " failures on 1200's that i have seen(play in wheel)have been down to bearing wear caused by water ingress/lubrication failure.the worst case senario being a seized bearing followed by total collapse.most riders tend to pick up on the vibes and noise before this happens!!

 

[mikeyboy]

having reread ref thrust bearings ,it would not be as simple as fitting an angular contact bearing on the wheel side as presumably it would need some way of preloading it(or setting a clearance) ,such as a taper bearing on the opposite side.i think it is safe to say that we are stuck with the design for the time being.

 

[ebbo]

I too read the post about an angular contact bearing being used and thought it the ideal solution, but if its obvious to me, why don't BMW do it that way

BTW, that is what I would fit...