Clutch master cylinder
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  1. #1
    Burn out champ 2010 Dusty's Avatar
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    Clutch master cylinder

    I have had no end of trouble with the clutch in my Austin.

    I shall be buying a new master cylinder tomorrow and re-plumbing the whole system.

    If I replace the 0.625" bore cylinder with a 0.750" one will the clutch feel noticeably heavier?

    It didn't feel particularly heavy when it was working and I'm hoping that moving more fluid may improve it.

    At the moment the master and slave are a matched new pair, designed for the Essex V6 and overdrive gearbox that they are attached to.

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    Official RnS Addict brading's Avatar
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    Might pay to read what Kapri says in this thread

    https://www.rodsnsods.co.uk/forum/tec...over-v8-327498

  4. #3
    I'm a grown up drunk! chevy2's Avatar
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    If its a girling type like whats fitted to mk2 cortinas etc theres one size in between at 0.700".

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    Off the Xmas card list kapri's Avatar
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    What was the set up from as I can check in my books as to OEM fitment. What problem do you have , clipping gears by any chance ie doesn't quite clear when trying to engage ?

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    Burn out champ 2010 Dusty's Avatar
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    Reliant Scimitar. New cylinders from a specialist which worked for a while but yes, those symptoms Kev although reverse is most troublesome.

    Struggling and failing to bleed the system this time.

    I pressure bled the system by putting the Gunson spare wheel device on the master and a vacuum sucker on the slave. Pressure at the pedal for one push and then gone again.

    The red translucent pipe doesn't show signs of leakage so I'm pretty much stumped.

    The m/c and pipe are very similar to the Marina

  8. #6
    Burn out champ 2010 Dusty's Avatar
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    Full story...

    Both cylinders were rusted and seized when I got the car. I bought new ones from a specialist which although not cheap seemed the obvious and quickest solution. The clutch worked okay but didn't really feel right.

    I lost the clutch while driving around and discovered fluid running down the bulkhead. QRG exchanged it with no quibbling and I had a clutch again.

    I moved the car around last week and all seemed fine. A few minutes later I got in the car and found the pedal up under the dash with the pushrod hanging off it. I replaced the circlip with a stronger one and fabricated a pedal stop.

    Since then I have been unable to achieve a working clutch.

    I have noticed that during the bleeding process, pushing the pedal down causes the fluid to rise toward the filler rather than forward. My deduction is that there is a problem with the seals. The pushrod is definitely coming far enough back, my new stop is only to take pressure off the circlip not limit travel.

  9. #7
    Off the Xmas card list kapri's Avatar
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    Yup, certainly sounds like seals to me Dusty. It may have nicked a seal edge when it popped back . As an aside I've had that happen on a Classic car when driving down the road but it was the brakes !!

    Is the pushrod at the slave adjustable or a fixed length ? I've had them where I've found the pushrod wasn't the correct length so it bottomed out on travel before fully depressing the clutch ie not moving the cyllinder inside the slave far enough back at it's starting point. Like the push rod allows only 1.5" travel when you need 2" a longer pushrod fixes the clearance issue providing it doesn't bottom the slave out ( internally) the other way.

  10. #8
    Burn out champ 2010 Dusty's Avatar
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    The slave isn't moving at all. There was a trace of fluid on the wrong side of the seal so I replaced that.

    I could replace the seal in the master but I am so fed up with it I am inclined to buy new from CBS. This requires a new pipe which means that the whole lot is new.

    Given that the clutch didn't feel heavy for the few dozen miles I've driven the car, will a larger master be an improvement?

    Thanks for the replies so far.

  11. #9
    Off the Xmas card list kapri's Avatar
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    Nope , larger m/c will make it heavier ( more fluid moved at lower pressure).

  12. #10
    Burn out champ 2010 Dusty's Avatar
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    I've gone a replacement of the same size.

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