Still clutch problems, please help

[boss1uk]

First problem was i lost clutch, (very silly i know)
bought a new one and slave cylinder (lightened flywheel while there of course)
Well that all went well but now after driving for a while clutch starts to slip. If i bleed it all works ok again for a few miles and then starts slipping again, again bleed and all ok.
Would have thought air in the system would have stopped me getting in gear as oppose to slip.
Air possibly getting in through bleed nipple so have ordered a new one.
Could it be the master cylinder or has the slave been put in incorrectly.
Any help would be really appreciated.
Thanks

[high52kojak]

Are you losing clutch fluid each time also?

[Tanguero]

Very hard to see how bleeding can stop it sliping, it should only make a difference to gear selection as you say. Could the slave cylinder be jamming in its bore and bleeding frees it somehow? Possibly something to do with fluid contamination on the friction surfaces?

[gruffalo]

Air in the system could cause slippage if it is heating up and expanding which would give the effect of slightly depressing the clutch peddle.

Are you losing fluid, if so check for spots under the car if none then check the master cylinder and the carpet in the foot well.

[amazon]

Hi Darren

Sorry to hear about your clutch problems - I can't offer any advice, sorry.

But on a lighter note - I did want to say - great pic on your 'profile'! I often replay in my mind your dash across the junction with your camera! (And you were still first away when the lights changed! ).

[WorAl]

Tanguero said:

Possibly something to do with fluid contamination on the friction surfaces?

This is what I was thinking too. May just be coincidence that it is not slipping when bleeding.

[boss1uk]

hi, thanks for replies
Im not losing any fluid!
Have washed through complete system with new 5.1 fluid
Im glad no ones mentioned master cylinder, Theres not anything we could have done at the slave cylinder end is there? Not that there are that many ways to put it together.
If for instance the 2 feed holes if where put at 3.45 and not 12.30 on the slave cylinder guess the trapped air could be expanding and holding the clutch off but then it would come back once cooled. It does get a bit better once cooled but not right until bled again.
I really dont want to take it all apart again,

[sk7ine man]

boss1uk said:

hi, thanks for replies
Im not losing any fluid!
Have washed through complete system with new 5.1 fluid
Im glad no ones mentioned master cylinder, Theres not anything we could have done at the slave cylinder end is there? Not that there are that many ways to put it together.
If for instance the 2 feed holes if where put at 3.45 and not 12.30 on the slave cylinder guess the trapped air could be expanding and holding the clutch off but then it would come back once cooled. It does get a bit better once cooled but not right until bled again.
I really dont want to take it all apart again,

Its more than likely if the bleed holes aren't at 12.30!

[Storer]

Too much copper slip grease put on the gearbox shaft by last person to change my clutch was causing drag as the plate had been contaminated. Not sure if it could cause your symptoms but bleeding helped with my problem too.
Solution was a new clutch and to clean the shaft.

[quesnon]

when you open the bleed nipple do you find that you are releasing pressure in the system ,if there is a build up of pressure this will cause slippage .the build up of pressure can be caused by a faulty master cylinder

[boss1uk]

will look at that tomorrow thanks

[WIL35]

I had the same problem with mine when I replaced my clutch, slave and master cylinder. I would bleed the system and everything was fine, then a few miles up the road the clutch would slip on hardish acceleration. I would open the bleed screw and fluid would shoot out!

I traced the problem to the small valve in the end of the (replacement) master cylinder. It must have been letting more fluid into the system as it was being operated. I rebuilt the old master cylinder with the seals from the new one and it has been fine for the last 15k miles.

Hopefully you have the same problem, I was just about to take the slave out to check it, but thankfully this fixed it!

I too like the picture in your profile, being the other Cerb in it!!!!

Edited by WIL35 on Monday 15th February 21:37

[boss1uk]

well hopfully ill be running by the time the next TITT comes along. Thanks will and Amazon

[FarmyardPants]

WIL35 said:

I had the same problem with mine when I replaced my clutch, slave and master cylinder. I would bleed the system and everything was fine, then a few miles up the road the clutch would slip on hardish acceleration. I would open the bleed screw and fluid would shoot out!

I traced the problem to the small valve in the end of the (replacement) master cylinder. It must have been letting more fluid into the system as it was being operated. I rebuilt the old master cylinder with the seals from the new one and it has been fine for the last 15k miles.

Hopefully you have the same problem, I was just about to take the slave out to check it, but thankfully this fixed it!

I too like the picture in your profile, being the other Cerb in it!!!!

Edited by WIL35 on Monday 15th February 21:37

it's called the recuperating valve I think

[boss1uk]

master cylinder ordered. watch this space

[zidmie]

Hi,

I also have a clutch slipping problem.
My clutch is 40000 miles.
I had a different clutch problem (difficult to change gears) 2 years ago, so I changed the master cylinder. It didn't change anything, then I put some isolating material around the exhaust, in order to avoid boyling of clutch fluid around, and it worked perfectly. I did around 1500 miles with this master cylinder, and yesterday the clutch started slipping.
So I guess there are 2 possible problems :
- clutch must be changed
- I have the same master cylinder problem as above?

I think I didn't fully understand how the master cylinder could get the clutch slipping. When I release the clutch, the oil circuit is opened? So it can't be pressurised anymore?

Thanks for the help!

[esso]

If your clutch is slipping then the most likely cause is worn clutch plates and you need to replace the clutch itself.

[Mr Cerbera]

Excuse me for thread-theft but I am in a similar situation.

16K ago (approx) lost clutch.
Replaced Master Cylinder.
Replaced Slave seals.
Bled system.

All OK.

4K ago lost clutch.
New seals in Master.
Replaced Slave with Raceprooved unit.
Replaced Clutch Pack (3 fingers broken).

Just started getting slippage.
Reservoir level fine and no leaks.
Thought it was my push-rod adjustment so slackened it off until it would bite OK.
Now she is difficult to engage when cold but still slips when hot.

I like the idea of air expansion under heat but could there really be enough expansion to separate the plates ??

Guess I’ll have to bleed to test.

Anyone heard of this problem befalling RP Slaves in particular ?

FarmyardPants said:

WIL35 said:

I had the same problem with mine when I replaced my clutch, slave and master cylinder. I would bleed the system and everything was fine, then a few miles up the road the clutch would slip on hardish acceleration. I would open the bleed screw and fluid would shoot out!

I traced the problem to the small valve in the end of the (replacement) master cylinder. It must have been letting more fluid into the system as it was being operated. I rebuilt the old master cylinder with the seals from the new one and it has been fine for the last 15k miles.

Hopefully you have the same problem, I was just about to take the slave out to check it, but thankfully this fixed it!

I too like the picture in your profile, being the other Cerb in it!!!!

Edited by WIL35 on Monday 15th February 21:37

it's called the recuperating valve I think

Hi Rog ‘n’ Clive,

Anmyone got a clue where this “Valve” is in here …



Ta !

Edited by Mr Cerbera on Thursday 21st November 16:47

[WIL35]

Hi,
It was a while ago, but it looks like it was part 13. The real one looked a bit different to the picture, more conical shaped. Was sat in the very end of the cylinder.

I never worked out why it would cause this problem but it definitely fixed my continuously pressurised clutch system.

Good luck!

[Mr Cerbera]

Cheers Clive