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84 Cj7 Hydraulic Clutch Slave

Discussion in 'Intermediate CJ-5/6/7/8' started by John A. Shows, Nov 26, 2018.

  1. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    I never have checked that but I can't imagine it not going all the way back in. There is no spring on it, but the clutch fork itself seems to serve as a spring. When the clutch fork returns it pushes the push rod back into the slave cylinder. I have an adjustable nut on a threaded push rod so that I can adjust it outward until it just comes into contact with the clutch fork without applying any pressure. I didn't want the throwout bearing spinning all the time. I think that's how it's supposed to work.
     
  2. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    Yes Mike that's exactly how my jeep was set up when I bought it. The little plastic cone looked kinda like a cap from a tube of caulking if I remember correctly. The first few times it happened the push rod would simply push straight through that plastic cone and do the same thing. Over extend. After that happened a couple times I made my own push rod from a bolt of the same diameter as the push rod. I cut the head off the bolt and rounded that cut end. On the other end...the threaded end, I put a nut on there that was larger than the hole in the clutch fork so it wouldn't pass through. Then I ground the corners off the nut itself so it kinda looked like an acorn nut. It seats in that clutch fork nicely while the end of the bolt passes through the hole. The nut also allows me to adjust the length so that it will come in contact with the fork at just the right location but not put pressure on it so that it causes the throwout bearing to constantly spin.
     
  3. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    The idea I'm toying with now is to attach a short cable from the clutch fork back to some solid point on the frame, or perhaps even to the bellhousing that will limit the throw of the clutch fork. I believe after the slave is extended as far as it will go (initially...when I first install it...before it eventually blows out) I still have another inch or more of travel in the clutch fork.
     
  4. Nov 27, 2018
    45es

    45es Member 2019 Sponsor

    Naches, WA
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    RATTYFLATTY asked: Have you checked to see if the slave is retracting all the way back in the bore? You might have a return action that is not completing the stroke, think 2 steps forward and 1 step back then repeat.

    Your reply:
    I believe the lack of a return spring on the clutch fork is as much a contributor to your problem as anything. Without the return spring, I believe the slave cylinder is retaining a small amount of fluid with each clutch stroke. You are possibly slowly building up the volume of fluid within the slave cylinder which eventually causes the blowout. The clutch fork spring forces the slave cylinder push rod fully into the cylinder preventing the buildup. See the AA installation instructions attached.

    https://storage.googleapis.com/advanceadapters-com/downloads/712568.pdf?1543334813=1
     
  5. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    that is a very good point and I will certainly attach a spring next time.

    Thanks for the tip.
     
  6. Nov 27, 2018
    45es

    45es Member 2019 Sponsor

    Naches, WA
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    Next time? Why not do it now. Cheap and easy test.
     
  7. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    I can't open that file Ed.

    I sure would love to see what it says. Reckon you could email it to me? john.shows@rac.com
     
  8. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    Sorry...I mean...this time...when I put it back in...again.

    I guess by next time that's what I was referring to.
     
  9. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    Disregard...I figured out how to open it. Had to save it to my desk top first.
     
  10. Nov 27, 2018
    45es

    45es Member 2019 Sponsor

    Naches, WA
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    Sorry about the attached file. I didn't think a pdf file would cause issues.
     
  11. Nov 27, 2018
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    I have another question. Every picture I've seen on-line shows that return spring attached to the clutch fork. I can't get my head around why there would need to be a spring here. I'm by no means a mechanic but it seems to me that the clutch itself causes the clutch fork to return. What additional return value could that little spring provide? Unless of course there's enough play in the fork that when the clutch fingers push the fork back it just doesn't push it all the way back. So...the clutch fingers return the fork to a point, and then you need the spring to bring it just a little bit further while pushing the piston back inside the slave. Is that what's going on?
     
  12. Nov 27, 2018
    tarry99

    tarry99 Member

    Northern California
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    To keep the throughout bearing off the clutch fingers.......when driving , needs clearance .................in your case as you mentioned having additional travel behind that location it will just just collapse the spring.......no big deal.................It's all about travel in the system and what it takes to fully disengage the clutch plate and still maintain some free-play.
     
  13. Jun 27, 2019
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
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    Dang! My last post on this stupid topic was Nov 27 of 2018.

    Well...I put the new slave cylinder on and this time I used the return spring and also I bought the slave from Advanced Adapters and they had a really nifty wedge shaped piece that nestled perfectly inside the groove of the nv4500 fork. I finally see the function of the return spring. It pulls the piston back inside the cylinder all the way and completely empties it of fluid. Only took 3 pumps of the pedal to bleed the line. I can't believe I've been so ignorant of that, but...it's on there so hopefully it'll stay this time.

    Optima Battery is dead as a hammer. They say it has a 3 year warranty and I bought it at Autozone and I would have sworn they'd have a record of the purchase but nope. They claim that if they don't have a record of it, that it must have been longer than 3 years. No way to research the actual purchase. All they can do is check the warranty status.
     
    45es and tarry99 like this.

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