Apart from all the sparkling stuff and extremely grey oil goo!
Took me a moment ....
Took me a moment ....
Anyone spot the problem here /:-|
- Thread starter DrFarkoff
- Start date
Here's it clean ...
Spotted it Yet??
Spotted it Yet??
You will have to give us a clue.
You have the advantage of the naked eye. We have to rely on your photographs, which you have to agree are not the best you've done.
You have the advantage of the naked eye. We have to rely on your photographs, which you have to agree are not the best you've done.
That gentlemen is where the rear bearing of the input shaft has machined its way through the rear of its cavity
Its a first for me! The little bit is what we used to call a "Coupon" when I was in the piping game
This is what one should look like!
Its a first for me! The little bit is what we used to call a "Coupon" when I was in the piping game
This is what one should look like!
What do you think caused that to happen? Lack of oil?
So the Yellow circle was a Red herring?....
No. It looks like a needle roller.
To a blind man on a galloping horse maybe
I'll dig out the camera and hopefully if there is some decent natural light I'll take photos of both
Very Un -nerving to pull the cover off and to be staring at the inside going Yeugh and Ooops whats that bit doing there
I have no idea what caused it unless some one rebuilt it and didn't get the input shaft into the bearing correctly ??
Very Un -nerving to pull the cover off and to be staring at the inside going Yeugh and Ooops whats that bit doing there
I have no idea what caused it unless some one rebuilt it and didn't get the input shaft into the bearing correctly ??
It's the circle/disc of metal from the case that's been machined out by the input shaft ;D
Yup Steppers is right it was just to draw attention to the wee bit
Here is what it should look like and even this one is wearing against the rear part of the bearing orifice
Here's what it looks like with the bearing sleeve tapped back in
This is the inside of the bit the was "cut" out by the bearing sleeve
This is it against what it should look like (but turned around because its damaged on the other side) You can still see the oil hole basic shape ( the small semi circle that is missing
Here is what it should look like and even this one is wearing against the rear part of the bearing orifice
Here's what it looks like with the bearing sleeve tapped back in
This is the inside of the bit the was "cut" out by the bearing sleeve
This is it against what it should look like (but turned around because its damaged on the other side) You can still see the oil hole basic shape ( the small semi circle that is missing
Interesting damage. I suppose the hole in the standard casing is there to relieve any build up of oil pressure.
So unless it failed due to casting weakness (unlikely as its too uniform) could it have be caused by the hydraulic action from an over filled final drive.
So unless it failed due to casting weakness (unlikely as its too uniform) could it have be caused by the hydraulic action from an over filled final drive.
Al I don't know for sure about that, I could use another casing but I don't have the gear to check the lash/backlash I can do the preload shim checks okay, Note the other casing in the pic the bearing is moving back to the alloy and cutting it too?
The guy that owns the 1150, had a 1200RT seize it's FD So he's understandably "wary" of any issues
Interesting damage. I suppose the hole in the standard casing is there to relieve any build up of oil pressure.
So unless it failed due to casting weakness (unlikely as its too uniform) could it have be caused by the hydraulic action from an over filled final drive.
Ian that bush is on the shaft and is press fitted on and it is supposed to be pretty much immovable and running in the area of the needle roller cage
That's the bit I am struggling to understand, How did it start moving and why did it keep moving so much so it "cut" it's way through the alloy??
My guess: the needle roller bearing jammed due to debris and started to spin its housing. The preload thrust would start the machining process into the housing and would be finished as it moved back and forth?...
What did the owner of the bike decide to do?
What were the symptoms that caused the owner to think they're was something wrong?
It would be interesting to understand
It would be interesting to understand
I can answer both questions: 1. The Doc built a new final drive with a used item from Motorworks along with much fettling. 2. No symptoms whatsoever. I'd ridden it over 1000 miles since purchase before asking The Doc to give it a front to back service and this is one of the things he came up with. It runs sweet now and having had a nasty experience with a 1200 FD I'm extremely grateful for The Doc's skill and attention to detail.
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