28 replies to this topic

[danie garry]

Hi all,

Been a while but after a very long process I now have the engine and box back in the car.... but I'm now running into a clutch issue

The only parts that are not new are the flywheel and pressure plate(pins/arm/plunger/release bearing/clutch plate/diaphragm/hydraulics are all new)
First attempt: Clutch bled fully, had just run the cam in and went to go for a little drive, all gears select ok but no drive when I take my foot off the clutch
Wok off, clutch and flywheel off so I had the spacing for the flywheel to the primary gear machined and the legs on the pressure plate skimmed to suit while it was apart

Second attempt: back together and we have drive, back and forwards a few times and just as I try to leave the garage it's as if the clutch pedal is permanently down
Wok off again, arm/plunger etc all double checked and back together and working again

Third attempt: get maybe a quarter mile, checked I had all gears and then the clutch does the same again, thankfully its level ground to push it back!

It's as if the diaphragm is getting hung up on something and not letting the clutch engage again

The whole lot is on the bench again so any advice greatly received!

[nicklouse]

Any pictures of the set up side on and around. We might spot something odd.

 

you have checked the hydraulics? No pinched hose or failing internals?

[danie garry]

 

don't mind the puller in the pics, just a makeshift clutch pedal! (clutch plate gets clamped and released as expected in the bench test)

 

hydraulics are all new, nothing wrong there, just strange how it will drive, then just let the clutch run free and then the mechanism works again once the wok has been off(suggests Diaphragm or release bearing to me but both new and no issues that i can see)

[blacktulip]

Did you lube the transfer gear splines? If not maybe the fiction plate is catching on the splines?

[danie garry]

Did you lube the transfer gear splines? If not maybe the fiction plate is catching on the splines?

Yup, all lubed up

[Spider]

If it's clamping up OK and is adjusted correctly when fitted, about all I can think of here is the friction face is contaminated with something.

I have found in recent years the new plates available today, don't like being handled with bare hands, I've found they nearly always slip after. I know we are supposed to wear gloves these days, but equally, it's easy to contaminate them too. I always use clean paper towel to pick them up.

 

I'm sure you've checked here, but so as to not make any assumptions;-

 

Have you seen the arm return ?

Does it return all the way ?

Does it do so following the movement of your foot on the pedal or is there some delay ?

[danie garry]

If it's clamping up OK and is adjusted correctly when fitted, about all I can think of here is the friction face is contaminated with something.

I have found in recent years the new plates available today, don't like being handled with bare hands, I've found they nearly always slip after. I know we are supposed to wear gloves these days, but equally, it's easy to contaminate them too. I always use clean paper towel to pick them up.
 
I'm sure you've checked here, but so as to not make any assumptions;-
 
Have you seen the arm return ?
Does it return all the way ?
Does it do so following the movement of your foot on the pedal or is there some delay ?

Hi Spider,

Wouldn't a contaminated clutch plate just feel like a slipping clutch as opposed to just a free spinning clutch?
The arm returns to the 7/16th bolt(should be enough?), when I had come to a standstill at the neighbours house I wound the bolt in to try and pull the arm in some more but I don't remember the arm coming back any further so you could be on to something there
I might double check the master, it's not new but it was unused so was on the shelf for a few years

Thanks for the advice so far lads

[blacktulip]

Be interesting to see the answer on this one...

[danie garry]

Just got 2 minutes to spare and threw the Wok back on(no clutch or flywheel in place) to rule out a hydraulic issue
Clutch arm returns no problem, only with the spring though, without the spring the hydraulics want to push out
Don't think it's anything that would be enough to keep the clutch permanently disengaged

[ACDodd]

Have you got the wrong length bolts fitted to the drive straps which will protrude through and hold the back plate from gripping the friction disc? The short one here is the one that holds the drive straps on, the long one is for the diaphram.

Ac

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Edited by ACDodd, 19 June 2022 - 07:58 PM.

[danie garry]

Have you got the wrong length bolts fitted to the drive straps which will protrude through and hold the back plate from gripping the friction disc? The short one here is the one that holds the drive straps on, the long one is for the diaphram.

Ac

Got the right bolts in the right place too, was hoping for it to be something simple like that too!

[weef]

Just an outside question but have you fitted the flywheel keyway washer as I do not see it in your pictures, just the bolt and the lock washer can be seen ?.

[danie garry]

Just an outside question but have you fitted the flywheel keyway washer as I do not see it in your pictures, just the bolt and the lock washer can be seen ?.

Yep, it was fitted, I was looking at another thread that pointed out it was offset and I hadn't noticed before so was checking that when I was taking the pics!

[nicklouse]

Open up the flywheel. 
 

look very carefully for marking.

 

any heat spots? 
 

photos.

[Spider]

I have been trying to recall as I came across this once before and I've just remembered what it was in that particular instance.

 

Have you had the pedal box apart ? If so, have you refitted the pedal return spring the right way around ?

 

This ^ is incorrect.

Also, is the Hose new and fitted without twists ?

Also, also ! with your foot off the clutch pedal, check that the pedal is clear of the inside of the bulkhead, it must have 2 - 3 mm clearance here.