1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Cj5 Clutch Conversion

Discussion in 'Early CJ5 and CJ6 Tech' started by tripilio, Apr 1, 2020.

Tags:
  1. Apr 1, 2020
    tripilio

    tripilio Proud American!

    Miami
    Joined:
    Aug 12, 2018
    Messages:
    930
    I am planing to convert my clutch to hydraulic and I'm looking for a true and tried approach. I have an F134/T90/D18 set. I was thinking about a pull style slave but I do not know where to attach it to yet. I was contemplating the option of drilling and tapping the two bosses on the side of the T90 that are leftovers from the side shifting system to use them as attachement points. Any idea is welcome. Thanks. (y)
     
  2. Apr 1, 2020
    OzFin

    OzFin Vintage Jeep Guy

    Michigan
    Joined:
    Jul 16, 2007
    Messages:
    940
    Not the same drive train as you are asking about, but maybe use this for ideas.
    I made this bracket for my 225 / T14 / D20.

    [​IMG]
    I bent flat stock steel into the shape of the letter C and welded it on the side of the triangle bracket so that it "cups" the boss on the transmission. To the rear of that I anchored it with a bolt through a spacer into the threaded hole on the transfer case. On the D20 that hole was previously used for the mechanical clutch torque tube pivot stud.
    This bracket is a very solid setup and work well.

    [​IMG]
     
    dozerjim, Tom_Hartz, Jonbbrew and 7 others like this.
  3. Apr 1, 2020
    wasillashack

    wasillashack Member

    Wasilla, Alaska
    Joined:
    Mar 17, 2008
    Messages:
    268
    My compliments, very sanitary work!
     
  4. Apr 1, 2020
    Jeepsterjim

    Jeepsterjim Member

    Lincoln, CA
    Joined:
    Apr 25, 2019
    Messages:
    401
    Nice job.
     
  5. Apr 2, 2020
    Jrobz23

    Jrobz23 Member

    Northern, WI
    Joined:
    Oct 3, 2016
    Messages:
    942
    I’ve had the same. What are you thinkin for pedals?
     
  6. Apr 2, 2020
    tripilio

    tripilio Proud American!

    Miami
    Joined:
    Aug 12, 2018
    Messages:
    930
    OzFin, awesome fabrication! Very clean! Is that a pull slave? Can you provide part numbers for the slave and master? Thanks!
     
  7. Apr 2, 2020
    OzFin

    OzFin Vintage Jeep Guy

    Michigan
    Joined:
    Jul 16, 2007
    Messages:
    940
    jackdog, Tom_Hartz and tripilio like this.
  8. Apr 3, 2020
    tomtom

    tomtom Sponsor

    Huntington Beach, CA
    Joined:
    Jun 20, 2007
    Messages:
    149
    I did mine with a push cylinder. Made the bracket and a push rod. Bracket attaches to the bell housing bolts. I had the mechanical linkage set up for a really easy pedal and wanted to keep that with the hydraulic conversion. I used the dorman catalog to look up specifics on master and slave cylinders until I got an area ratio close to the mechanical ratio. It worked out great. It does have a pretty short throw for the release but once I drove it a bit it doesn't bother me at all. Pedals are from an intermediate.

    Master
    https://www.amazon.com/gp/product/B003H0W0RG/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1

    Slave
    https://www.amazon.com/gp/product/B001PYG9EG/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

    [​IMG]

    [​IMG]

    [​IMG]
     
    tripilio likes this.
  9. Apr 3, 2020
    tripilio

    tripilio Proud American!

    Miami
    Joined:
    Aug 12, 2018
    Messages:
    930
    Looks awesome, but I have a different bell housing. I have an F134. In my case, the fork is fully enclosed by the bell housing and a cable pulls through a hole in it. I don't think I can do it like that.
     
  10. Apr 3, 2020
    iharding

    iharding Quitter

    Tacoma, WA
    Joined:
    Feb 24, 2013
    Messages:
    354
    I just learned about so-called hydraulic throwout bearings. It puts the slave cylinder in the bellhousing with the throwout bearing. Seems simple!

     
    tripilio likes this.
  11. Apr 3, 2020
    tomtom

    tomtom Sponsor

    Huntington Beach, CA
    Joined:
    Jun 20, 2007
    Messages:
    149
    Oh yeah, I forgot about that! I have an F134 too, but I swapped the bell housing to use a different transmission.
     
    tripilio likes this.
  12. Apr 3, 2020
    Jrobz23

    Jrobz23 Member

    Northern, WI
    Joined:
    Oct 3, 2016
    Messages:
    942
    I’ve heard of people using internal slaves on a F134 but I’ve never seen any pics or details of a project.
     
    tripilio likes this.
  13. Apr 3, 2020
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
    Joined:
    Feb 9, 2018
    Messages:
    5,627
    I've heard a lot of negatives about the hydraulic slave inside the bell housing. Mostly that they aren't very reliable, and you're pulling the motor or the transmission to fix it.

    At least an external slave is easy to fix. You aren't trail fixing an internal one.
     
    45es, wheelie, Tom_Hartz and 2 others like this.
  14. Apr 3, 2020
    sterlclan

    sterlclan Member 2022 Sponsor

    exploring the...
    Joined:
    Feb 21, 2009
    Messages:
    3,869
    Everything I’ve ever seen with an internal slave has broken at least once.
     
    tripilio likes this.
  15. Apr 3, 2020
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
    Joined:
    Aug 13, 2015
    Messages:
    6,656
    When I worked at the 4wd shop, the most frequent job I did was replace leaky YJ throw out bearings.
     
    FinoCJ and tripilio like this.
  16. Apr 3, 2020
    tripilio

    tripilio Proud American!

    Miami
    Joined:
    Aug 12, 2018
    Messages:
    930
    ...and they are pricey!:shock:
     
    ITLKSEZ likes this.
  17. Apr 3, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
    Jul 18, 2013
    Messages:
    5,593
    Did you by any chance do this in Colo Springs and replace the one on my 89YJ back in the golden days of 1997?

    and yes it broke my budget as a college student...that was probably when I decided I better learn to fix stuff myself. Not long after I had a leaky fuel 'roll-over/shut off' valve that I did myself. Not a lot to it of course, but it was a start. Sold the 4cyl YJ a few months later for a 6cyl cj7...
     
    ITLKSEZ likes this.
  18. Apr 3, 2020
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
    Joined:
    Aug 13, 2015
    Messages:
    6,656
    Nope, this was in Auburn, PA.
    Maybe ‘99-ish
     
  19. Apr 4, 2020
    wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

    York, PA
    Joined:
    Mar 6, 2004
    Messages:
    4,491
    Internal slave cylinders and hydraulic throw out bearings are 2 of the worst automotive innovations in history. Just my .02.
     
    Tom_Hartz and tripilio like this.
  20. Apr 4, 2020
    Jrobz23

    Jrobz23 Member

    Northern, WI
    Joined:
    Oct 3, 2016
    Messages:
    942
    I generally dislike the internal slaves since they are a bear to replace. That being said, this isn't being put behind an engine that will go 200k-300k between rebuilds. An F134 would be lucky to outlive its clutch. In that frame of thinking, on top of the fact that no OEM mounting bosses exist for an external, I wouldn’t mind an internal on this application.
     
    tripilio likes this.
New Posts