When replacing the cable on my clutch recently, I found that the whole clutch body can move axially by between 20 to 30 thou. (Not measured accurately)
Is this normal? If not, what could be the problem?
As I see it, it could be either the clutch body/sprocket is moving on the shaft, or the whole gearbox main shaft is moving.
Any advice please before I start tearing it all apart.
If the clutch is engaged (…
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Previously karl_nixon wrot…
Previously karl_nixon wrote:
If the clutch is engaged (cable is slack) then the diaphragm spring pressure should easily hold the inner and outer baskets firmly together. So play is either sleeve gear bush wear (a common issue) or loose clutch retaining nut (another common issue).
Play between the inner and outer baskets can be checked once diaphragm spring and clutch plates have been removed. Normally there is up to 1/16" movement at the sprocket teeth just due to normal tolerance of the bearing. More than that is a problem or any roughness in the bearing as the outer basket revolves around the inner one.
With the diaphragm spring removed you should also be able to see if the clutch is loose on mainshaft or not. If you remove the clutch adjustment nut an screw from the diaphragm spring you may be able to see the mainshaft through it if you are lucky an it needs removing to fit the spring compression tool if not anyway.
Thank you for this Karl.
I think the easiest is to open it up, see if the clutch is moving on the shaft or if the shaft is moving in the gearbox. Ho Hum, another day gone.
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I have now stripped the cl…
I have now stripped the clutch, taken out the plates but left the outer drum/sprocket and inner hub in place.
The outer drum moves axially on its large roller bearing by about 20-30 thou. It can also rock (about a vertical axis)
The central hub has no axial movement - thank goodness!
Should there be some shim behind the drum to take up all this movement?
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Previously richard_salt wr…
Previously richard_salt wrote:
I have now stripped the clutch, taken out the plates but left the outer drum/sprocket and inner hub in place.
The outer drum moves axially on its large roller bearing by about 20-30 thou. It can also rock (about a vertical axis)
The central hub has no axial movement - thank goodness!
Should there be some shim behind the drum to take up all this movement?
Sounds correct to me. I remember buying a new drum and bearing and was disappointed as the play was about the same as my 50,000 mile one.
Its a single row race so there will always be a small amount of play which is amplified on the large diameter drum.
If you look on youtube at videos of a bike running with the cover off you will see they move about quite a bit
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I agree, nothing to worry…
I agree, nothing to worry about. The play is only apparent when the clutch is lifted - when engaged the spring holds it all in place.
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If the clutch is engaged (cable is slack) then the diaphragm spring pressure should easily hold the inner and outer baskets firmly together. So play is either sleeve gear bush wear (a common issue) or loose clutch retaining nut (another common issue).
Play between the inner and outer baskets can be checked once diaphragm spring and clutch plates have been removed. Normally there is up to 1/16" movement at the sprocket teeth just due to normal tolerance of the bearing. More than that is a problem or any roughness in the bearing as the outer basket revolves around the inner one.
With the diaphragm spring removed you should also be able to see if the clutch is loose on mainshaft or not. If you remove the clutch adjustment nut an screw from the diaphragm spring you may be able to see the mainshaft through it if you are lucky an it needs removing to fit the spring compression tool if not anyway.