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Hydraulic clutch question

Discussion in 'Early CJ5 and CJ6 Tech' started by DanStew, Apr 29, 2006.

  1. Apr 29, 2006
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
    Joined:
    Sep 22, 2002
    Messages:
    4,585
    My hydrolic clutch works just fine, i dont have problems with it, but it is tough bugger to push the peddle in to engage the clutch. Looking at the fireway, the clutch Mc has bent and deformed the friewall palte i put in to mount the brake and clutch MCs. I am going to repalce the plate on the wall, and probably weld it in. The MC is mounted in the same palce as my older one that was a bit smaller bore, and that other MC didnt bend the firewall plate. The original clutch was a hydrolic clutch for a T90, now since i am using the T18, i am not sure why the clutch would be harder to push. I kept the bracket to the slave cylidner prett much the same but it just is much harder to use the clutch. Any reason why it is diifuclt to push the pedal in? The return spring on the pedal and slave are not that heavy and are not responsible. Lets brainstorm about this, since i have it apart and can easily get to things.
     
  2. Apr 29, 2006
    LWB

    LWB ..they call me "Cooter"

    Chicago
    Joined:
    Feb 25, 2003
    Messages:
    206
    Re: Hydrolic clutch question

    A bigger master cylinder bore will give you less travel and take more effort to move.
     
  3. Apr 29, 2006
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
    Joined:
    Sep 22, 2002
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    4,585
    HHHHMMMM.... OK. I do have anothe MC sitting around, the smaller one, i will toss that on and see what it does. If i remember the problems i had before, it turned out i had too much throw, so i will try it.

    Thanks cooter!!!
     
  4. Apr 30, 2006
    Posimoto

    Posimoto Hopeless JEEP Addict

    Minden, Nevada
    Joined:
    Aug 7, 2003
    Messages:
    4,538
    Re: Hydrolic clutch question

    I'm not so sure that's true. I was under the impression that a larger bore on the MC pushed more fluid and should give you more mechanical advantage on the pedal end. I don't see how it could give you less travel on the slave.
     
  5. Apr 30, 2006
    chevyjeep

    chevyjeep Member

    Elkgrove, Ca
    Joined:
    Dec 17, 2005
    Messages:
    80
    What type of pressure plate are you useing? A three fingure is harder to push than a diaframe type.
     
  6. Apr 30, 2006
    Hawkes

    Hawkes Member

    Nova scotia
    Joined:
    Jun 18, 2003
    Messages:
    490
    I've been researching this lately for a project, and read all the old posts. From what you said before your pushrod doesn't bottom out does it? The only other thing I thought of was the leverage on the pedal, same pedal setup as before? A bigger lever means less effort.

    Paul
     
  7. Apr 30, 2006
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
    Joined:
    Sep 22, 2002
    Messages:
    4,585
    It is a diaphram type of pressure plate. I got the other MC hooked up, i didnt use it yet, but it is connected and will try that again later. From the problems i had before, after it was all said and done, it turned out i was getting too much throw. I wasnt bottoming out, i believe i was actually pushing it soo far it was making the throwoutbearing bind against the pressure plate. So i will try it again with the old. It was still making the noise with the original MC and the larger one, but i decided to try adn just push the pedal a little bit and not all the way and the clutch engaged. So quick possibly i was pushing it all the way with the old one when i should have just did it a little. I can already tell just by bench bleeding the smaller MC it is much easier to push. There is that spring inside, quite possible it is also stronger for the larger bore MC. Thanks All!!
     
  8. Apr 30, 2006
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
    Joined:
    Sep 22, 2002
    Messages:
    4,585
    I got the oter MC in and the clutch works fine, still it is just not as soft as you would think a hydrolic clutch would be, or am i just mislead thinknig that a hydro clutch will just be much easier to use than a cable clutch or linkage clutch? I mean the effort to push th epedal in is not that bad, I am just worried about bending the firewall plate again.

    here is pictures of the firewall plate. it is not wimpy steel, it is about 16-18 gauge. It lasted a long time, maybe it was just time it gave up. If you notice i did bolt it on to the firewall, and from the looks at the bolting points there would be some give at the metal above the clutch MC. So this time i would weld in a new piece of steel rather than bolt it in.

    what sayeth you all?
     
  9. Apr 30, 2006
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
    Dec 17, 2002
    Messages:
    2,362
    Here's a thought. On my Clutch MC there is a steel washer that holds the rod into the bore. If the rod isn't aligned just right. the rod may bind while sliding though the washer. I found that mine was sticking because of this.
     
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