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 Slave Cylinder Seal

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Duquois
Montanarolo
Montanarolo


Posts : 17
Join date : 2014-01-24

PostSubject: Slave Cylinder Seal   Wed Jun 24, 2015 9:28 am

Hi All,

Does anyone have the part number or a reference for the clutch slave cylinder seal please.

A few days ago I lost virtually all of the clutch lever travel in the space of a ride out and just got back home.
I bled the clutch which worked fine for two days, (the fluid was black from being done last summer). Then it failed completely about 25 miles from home. Luckily I managed to get back without needing to change gear much. I bled it again and the fresh 2 days old fluid had turned black. It's working again but obviously needs attention so I'm not using it.

The master clutch seals are fine and the grub screw to the plunger on the clutch lever is ok so I'm guessing it's the slave cylinder seals? There are no apparent leaks from the slave cylinder housing.

I've found the Grimeca 'cluch command cylinder' part number which is 978739 but can't find one for a replacement seal, which I intended doing next.

The bikes done close to 60k miles now. Any ideas please? Are there any other parts you'd recommend I'd change whilst I've got access to the clutch area?

Is it possible to gain access to the slave cylinder without removing the swinging arm? The shock linkages are 'now' nicely greased so don't need attention!

Any thoughts appreciated. Thanks

Andrew
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pauldaytona
Fra Cristoforo
Fra Cristoforo


Posts : 379
Join date : 2014-01-07

PostSubject: Re: Slave Cylinder Seal   Wed Jun 24, 2015 10:53 am

I've never seen the seal as available item. So get the whole thing. I've also never heard of one failing

Ive never tried to get it out, start with removing the 3 screws and see if you are lucky.
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Pete Roper
GRiSO
GRiSO


Posts : 3769
Join date : 2013-05-29
Age : 59

PostSubject: Re: Slave Cylinder Seal   Wed Jun 24, 2015 11:00 am

Are you sure it isn't the plunger in the small barrel on the clutch lever having come loose and spinning around of its own volition?

Take the lever off the master cylinder and see of the plunger moves. If it does? Check to see if the 2.5mm grub screw in the barrel is still there.

This is by far the biggest cause of clutch issues.

Pete
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Duquois
Montanarolo
Montanarolo


Posts : 17
Join date : 2014-01-24

PostSubject: Re: Slave Cylinder Seal   Wed Jun 24, 2015 1:56 pm

Hi Pete, I checked the plunger screw and its fine.That did happen to me once before.The seal in the master cylinder is ok too.
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Duquois
Montanarolo
Montanarolo


Posts : 17
Join date : 2014-01-24

PostSubject: Re: Slave Cylinder Seal   Wed Jun 24, 2015 1:58 pm

Paul, I'll probably end up getting the whole slave cylinder.
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pauldaytona
Fra Cristoforo
Fra Cristoforo


Posts : 379
Join date : 2014-01-07

PostSubject: Re: Slave Cylinder Seal   Wed Jun 24, 2015 2:30 pm

Thats what I was telling you :-)

But you are shure leak isn't at the master ?
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Duquois
Montanarolo
Montanarolo


Posts : 17
Join date : 2014-01-24

PostSubject: Re: Slave Cylinder Seal   Thu Jun 25, 2015 12:27 am

Hi Paul,
Yep, pretty sure it's not the master. The fluid levels haven't altered between bleeds.
Cheers
Andrew
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Pete Roper
GRiSO
GRiSO


Posts : 3769
Join date : 2013-05-29
Age : 59

PostSubject: Re: Slave Cylinder Seal   Thu Jun 25, 2015 12:32 am

Well it can't be the slave either. If the integrity of the system is bad then fluid would have to be escaping somewhere. If it isn't? Then seals can't be the problem.

Pete

PS. Loose bolts retaining the slave maybe?
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Duquois
Montanarolo
Montanarolo


Posts : 17
Join date : 2014-01-24

PostSubject: Re: Slave Cylinder Seal   Thu Jun 25, 2015 12:41 am

Could be the slave bolts, I'll check tonight.
I wondered if the seal in the slave have failed then the plunger wouldn't have any effect?
Maybe talking shite.
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