Benzine
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| posted on 27/5/09 at 07:39 PM |
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Hydraulic clutch
I've got a hydraulic clutch on my MK, it's all plumbed in okay with no leaks. It seems to bleed okay, it gets nice and firm and moves the
clutch release arm perfectly... but it only does this for maybe 20 or 30 pumps, over which time it fades until I can't change gear anymore.
There are no fluid leaks, there surely isn't trapped air as it was working fine... what could the problem be? Letting air in? Problem with the
slave cylinder in the gearbox?
I've got my engine out at the moment so I want to get it sorted while it's all easy to get to
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r1_pete
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| posted on 27/5/09 at 07:43 PM |
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What sort of flexible hose are you using? if its an old rubber/nylon one, they can as they warm up, swell as you press the clutch, hence fluid
transfer to the slave is reduced.
[Edited on 27/5/09 by r1_pete]
[Edited on 27/5/09 by r1_pete]
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Benzine
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| posted on 27/5/09 at 07:47 PM |
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I've not got flexible hose yet, just a copper line to it to test it
Where could I get a flexible hose made btw? I'm not sure what threads are at each end...
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spdpug98
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| posted on 27/5/09 at 07:52 PM |
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Is the pushrod into the M/C straight, I had a problem with a M/C due to the push rod not being square, and this caused some marking on the inner
surface of the cylinder and was allowing air into the system (but no leak) through the primary seal..........or this is what I believe was causing my
problem
My Blog: http://spdpug98.wordpress.com/
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r1_pete
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| posted on 27/5/09 at 08:06 PM |
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Do you get air out when you re-bleed it, after is starts dragging? if so air must be getting in, check all your connections.
Maybe the seals are starting to fail as they warm up in use.
I got my flexies from Furore Cars, best vfm I found, sure he's on here too.
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blakep82
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| posted on 27/5/09 at 10:05 PM |
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quote:
Originally posted by r1_pete
I got my flexies from Furore Cars, best vfm I found, sure he's on here too.
yep russ bost
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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britishtrident
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| posted on 28/5/09 at 06:30 AM |
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quote:
Originally posted by r1_pete
What sort of flexible hose are you using? if its an old rubber/nylon one, they can as they warm up, swell as you press the clutch, hence fluid
transfer to the slave is reduced.
[Edited on 27/5/09 by r1_pete]
[Edited on 27/5/09 by r1_pete]
Dosen't quite work that way --
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 28/5/09 at 06:32 AM |
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Is the pedal going completely solid after X pumps ? or is the clutch no longer clearing ?
If the former you need a return spring on the slave cylinder
If the latter you have air getting into the system.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Benzine
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| posted on 28/5/09 at 07:17 AM |
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quote:
Originally posted by britishtrident
Is the pedal going completely solid after X pumps ? or is the clutch no longer clearing ?
If the former you need a return spring on the slave cylinder
If the latter you have air getting into the system.
It is the latter, yes. Would the air be getting in at the M/C?
Clutch is one of these units from OBP:
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Benzine
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| posted on 20/6/09 at 05:34 PM |
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Bumpz0r.
I've just refit the clutch since engine rebuild and I've tried to bleed it again. I've got a proper clutch hose made up and
I've used PTFE tape round all the joints, crush washers in the right places and double checked everything. I'm sure the hose is tighter
than a.... Every time the pedal is pumped some clear liquid comes through, then a fine mist of bubbles so it looks milky.
I've phoned OBP and they'll happily replace the unit for me (good on them) but I just wanted to check... is it possible that the problem
is the slave end? Ideally I'd take off the hose at the slave end and watch the liquid when being bled, if all clear then it would comfirm that
M/C is fine... but I don't have anyone to help me bleed the clutch until monday  (can't find eazi bleed kit anywhere)
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