81 hyraulic clutch

hooksey

hooksey

Hero member
Location
Vic , Australia
G,day fellas,
Had a leaking seal on master cylinder piston so purchased new piston kit and installed it.
Checked bore for scratches , looked good no hone needed.
New fluid dot 4 bled thru system and now the clutch actuation feels like it has a notchy feel about it ?
You pull lever in an inch and you get resistance,( like it hits the stopper) and then you pull harder
and she activates and operates normally until the next gear change.??

New kit solved leak! Clutch activation was normal before new piston kit installed.
Old rubber hoses still fitted !
Slave cylinder has not been touched 15yrs.

Anyone point me in the right direction. Thanks
Hooksey.



 
Long shot, but is the sprocket cover back on square? There are no locating dowels so it is possible to have some movement when retightening.

Try slackening off the bolts and trying to realign the cover. Maybe the piston to pushrod position was off a smidge.

Did you lubricate the new seal with hydraulic fluid? Maybe it is 'dry' and causing the bitty feel you describe.
 
Suggestion 1: Master Cylinder - The outer wiper seal on piston is too tight.

Suggestion 2: Master Cylinder - Piston needs a very liberal smear of assembly grease(supplied in kit).

Of course to fix these the m/c comes apart again.
 
Fellas, Lubricating grease used spareingly on rubber seals only , did not put any on the body of the piston ?

The slave cylinder end has not been dismantled !

That was the word,( BITTEY) i was looking for to describe how the lever felt. Ta
Bit like the mozzies out in the shed t,nite.

Hooksey.
 
guess now that the master delivers more hydraulic pressure, the O-Ring on the slave gets a problem... Replace that one, too, just to be sure it's not that problem. Will else cause you a problem soon anyway...
 
Hooksey,

Put a dab of grease on the piston where the lever pushes it.  And, while you're at it, lube the lever in its' pivot.  Often neglegted, often overseen....

As Lothar stated, not a question if, but only when the slave starts leaking!

piet
 
How much slack should there be at the lever on a hydraulic clutch?  At the moment mine has what you'd expect on a cable clutch- about 5 mm at the end of the lever. 

Reggie
 
Reggie3cl said:
How much slack should there be at the lever on a hydraulic clutch? 
Click to expand...

As little as possible..... what matters is that the piston can return to it's rest position, as little as 0.5mm between lever and piston is enough.  The small amount of clearance helps in getting the maximum travel at the slave cylinder, too much clearance and you are unnecessarily giving away slave piston travel.  Lav gearboxes are prone to grunching, so give it all the freedom you possibly can.

Important to keep an eye on the lever slack, if it changes there's something going on in the hydraulics.


piet
 
Ta, it's been a while since I've had anything as sophisticated as a hydraulic clutch...  Clutch feels much better with the correct number of plates, new line and seal, not much heavier than the GS really.  Hope it doesn't slip tho'

Reggie
 
Lothar, pivot point of lever is has always had lube !

Have you got a part no for the slave o/ring and are there any other
bits at the slave end that may need replaceing ?

Maybe some shite pushed thru when bleeding new fluid thru, at slave end (partial blockage) will strip n clean
for look see.
Hooksey.
 
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