1 [solved]moved pilot bearing bush Thu Nov 07, 2019 9:30 am
tinyspuds
Life time member
Sorry to bring up a problem thats been discussed a couple of times in the last 15 years but I wonder if anyone has developed a low tech solution.
I used a 3 legged puller to slide my clutch housing off the output shaft. Unfortunately, the point of the puller has driven the brass centre of the shaft about 8mm down the shaft towards the bike front.
From what I’ve read this brass piece is the ‘pilot bearing bush’.
1) is there actually a ‘pilot bearing’ or just this bush?
2) I gather that the bevelled end of the clutch release rod must ride in the hole at the centre of the bush?
3) Number 2 being the case, I guess I need to get the bush out and replaced.
Previous solutions included tapping and extracting the bush. Anyone think I could achieve the same using a left hand drill?
I think the shaft has oil holes so the presence of brass swarf doesn’t sound like a great plan with either solution.
Some of this info is a bit unclear due the the number of design changes that occurred with the shaft 85/86.
Even though the tap solution has apparently worked I applied quite some pressure to move the bush down the shaft before I worked out that something must be wrong. Not convinced that tapping a thread would allow the bush to be pulled with a screw short of using a slide hammer (any thoughts)?
And if you can get it out that way, how would you secure the replacement ((heat)?
So far I have been unable to locate a source for a replacement bush.
Tapping and machining are way out of my skill set, which means I have to build a stand for the bike to get the sump off and the shaft out and take it somewhere or source a used shaft
Given that the bike is already stripped from the clutch backwards I am hoping for a low tech fix that minimises the chance of more cock ups.
Cheers, Stu
PS a thin walled socket that matched the shaft diameter with the puller point inserted in the 3/8 square socket hole allowed me to get the housing off without further damage.
I used a 3 legged puller to slide my clutch housing off the output shaft. Unfortunately, the point of the puller has driven the brass centre of the shaft about 8mm down the shaft towards the bike front.
From what I’ve read this brass piece is the ‘pilot bearing bush’.
1) is there actually a ‘pilot bearing’ or just this bush?
2) I gather that the bevelled end of the clutch release rod must ride in the hole at the centre of the bush?
3) Number 2 being the case, I guess I need to get the bush out and replaced.
Previous solutions included tapping and extracting the bush. Anyone think I could achieve the same using a left hand drill?
I think the shaft has oil holes so the presence of brass swarf doesn’t sound like a great plan with either solution.
Some of this info is a bit unclear due the the number of design changes that occurred with the shaft 85/86.
Even though the tap solution has apparently worked I applied quite some pressure to move the bush down the shaft before I worked out that something must be wrong. Not convinced that tapping a thread would allow the bush to be pulled with a screw short of using a slide hammer (any thoughts)?
And if you can get it out that way, how would you secure the replacement ((heat)?
So far I have been unable to locate a source for a replacement bush.
Tapping and machining are way out of my skill set, which means I have to build a stand for the bike to get the sump off and the shaft out and take it somewhere or source a used shaft
Given that the bike is already stripped from the clutch backwards I am hoping for a low tech fix that minimises the chance of more cock ups.
Cheers, Stu
PS a thin walled socket that matched the shaft diameter with the puller point inserted in the 3/8 square socket hole allowed me to get the housing off without further damage.
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1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106.
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
2000 Hayabusa with Charnwood chair, Wasp forks and EZS wheels.