What you don't want to find.

[Steptoe]

A high mileage 1150 limped in today. Gearbox all rattley and jumping out of the lower gears and no 6th. But still able to plough on to it's destination in 5th gear .

Took the box out and the input shaft was wobbling about with the input bearing hangin out.
Took it apart and i'm amazed it kept going, these 1150's have crude but tough old boxes.

Took the cover off, and 1st gear is toast





Oh, and these rolled out



Second gear is hanging on in there





Sixth did try.



Sorted through the "assorted gearbox parts" box and have almost all the replacement gears, here's the diference between the two types of input shaft constant speed gear.



And while i've got the gearbox bits out here's an input shaft with good splines and a worn one. And that was enough for me today, i hate the smell of burnt gear oil.

 

[Wanderer]

Any idea as to what caused the damage Steppers, the first step in the destructive chain so to speak?

 

[Steptoe]

Any idea as to what caused the damage Steppers, the first step in the destructive chain so to speak?

i think, but can't be 100% sure it was the input shaft bearing failing.

 

[Flashman]

Thanks for an interesting & informative post. When you say high mileage, what do you class as high?

 

[Steptoe]

Thanks for an interesting & informative post. When you say high mileage, what do you class as high?

210K miles.

 

[JonF]

'kin amazing it was still running at all

 

[Twotter]

Is it the original gearbox?

 

[Stewart H]

Just pop a bri nylon shirt in there and its good for another 210k

Stewart

 

[Buz]

Good post Steptoe, one cog looks just like another to me i'm afraid

 

[motobiker]

To be honest i found this post hugely reassuring. not that i needed reassuring.

however.

ignore the damage which is due to a catastrophoc failure.. and a rare one at that.

The undamaged cogs are in amazingly good condition given the mileage. crude they may be - but "tough" is right on the button.

 

[DutchBryn]

Yes, but what oil was he using?

 

[bart2181]

210k miles,mr bmw designers got alot to answer for,i knew i should have bought a africa twin

 

[MattW]

Ouch
That's a bit of a mess!
Looks like the gears tried to eat those loose balls.

 

[elevensies]

bet its on original clutch though