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Hot Rods clutch diagnosis

Discussion in 'The Hokey Ass Message Board' started by goldmountain, Jun 25, 2018.

  1. goldmountain
    Joined: Jun 12, 2016
    Posts: 4,476

    goldmountain

    I can't move my shifter with the engine running so I figure my clutch isn't disengaging fully. Does anyone know how far it should move at the throwout bearing? Got all sorts of mismatched parts on my car. Chev 350 with a Ford toploader overdrive IMG_1061.JPG trans (T176?) with Jeep shifter, cast iron truck bellhousing with rh clutch fork, 85 Mustang diaphragm clutch, Datsun pickup slave cylinder and Toyota vanwagon clutch master cylinder. Everything seems to work when I step on the pedal. Hope someone looking at the picture can figure it out.
     
    chryslerfan55 and Bandit Billy like this.
  2. F-ONE
    Joined: Mar 27, 2008
    Posts: 3,271

    F-ONE
    Member
    from Alabama

    That is a mixed bag.

    I know on flathead adaptions like this the three finger Older Ford Clutch is preferred over the diaphragm type.

    The leverage is not looking right to me. Can you move the slave rod out on the clutch lever?
     
    3340 likes this.
  3. vtx1800
    Joined: Oct 4, 2009
    Posts: 1,719

    vtx1800
    ALLIANCE MEMBER

    I had a similar issue with my clutch and there was a thread on it. I was using a Borg and Beck three finger clutch, it had served me very well but suddenly wouldn't disengage. I won't go through all of the fun stuff I did but ultimately I installed a diaphragm clutch from Speedway. I still had issues until I "adjusted" my linkage to give more throw. With a mechanical linkage and Z Bar it is easier to do.

    I am not sure (and this may be because of the camera angle) but it seems to me that your clutch release arm angle should be at this point (angle) when the clutch is depressed. Maybe move the pivot point closer to the engine? Thicker throw out bearing?
     
  4. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,929

    jimmy six
    ALLIANCE MEMBER

    Sounds like it's not releasing. Have some one sit in the car and step on the clutch and use a feeler gauge to read the gap between the disc, plate, flywheel. I'll bet there is not any.
    Also watch to see the fork arm movement as they step on the pedal. Have them tell you how estimate each inch the pedal moves down to how much movement you see. If not much, reblead the system. If it doesn't move enough you may need a slave cylinder with a smaller diameter piston.
     

  5. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,874

    302GMC
    Member
    from Idaho

    My memory tells me that should have the long release bearing, not the short.
     
  6. alwaysamopar
    Joined: Oct 2, 2015
    Posts: 126

    alwaysamopar

    The one pic doesn't seem to show the tob pushing the fingers on the diaphragm. When clutch pedal is released. .is there play on adjustment rod? If yes then I'd adjust that rod longer first. Looks bottomed out short. You do need some play there though .

    Sent from my SM-G900V using The H.A.M.B. mobile app
     
  7. alwaysamopar
    Joined: Oct 2, 2015
    Posts: 126

    alwaysamopar

    This too possibly!

    Sent from my SM-G900V using The H.A.M.B. mobile app
     
  8. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 12,687

    Johnny Gee
    Member
    from Downey, Ca

    Needs longer throw out bearing or adjustable ball pivot to correct pivot ratio. That is of course that I'm assuming everything in the photo is at rest?
     
  9. Looks like the fork is hitting the bell housing ?

    The way to fix that is a long throw out bearing. Then you have the slave adjustment to figure out because the fork will move much closer to the slave.
    Just by the bellows boot, it's in relaxed position with no room for the fork to move.

    I have no idea how far the clutch fingers need to move but they need to move enough to get you an air gap of 0.030 between the clutch disc and the pressure plate. Minimum.
     
  10. goldmountain
    Joined: Jun 12, 2016
    Posts: 4,476

    goldmountain

    Thanks for the response,guys. Guess I'll try the long throw out bearing idea. Just hate the thought of dropping the transmission. Should have used something with an aluminum case.

    Sent from my SM-T350 using The H.A.M.B. mobile app
     
  11. Witle up a spacer to simulate along bearing and see if that will give you a 0.030 air gap. Know before you try all the labor.
     
    Johnny Gee likes this.
  12. BJR
    Joined: Mar 11, 2005
    Posts: 9,915

    BJR
    Member

    Is the disc put in facing the correct way?
     
  13. X-cpe
    Joined: Mar 9, 2018
    Posts: 1,985

    X-cpe

    With the car jacked up and in gear have someone push the clutch in and try to turn the drive shaft by hand.
     
  14. SASROD
    Joined: Feb 7, 2007
    Posts: 150

    SASROD
    Member

    Johnny Gee is asking if you are pushing the clutch in when you took the photo. Are you?
     
  15. And I believe the access to the pivot has something in the way, like a transmission. Possible to slide it back to get access, make up some pilots (cut the heads off long bolts..) to make it easier.
     
  16. goldmountain
    Joined: Jun 12, 2016
    Posts: 4,476

    goldmountain

    Well, after giving it some more thought, since r&r tranny isn't really something I want to do, I adjusted my pushrod at the master cylinder and the magic happened! Finally took the car for its first drive out of the garage. Went around the block; no insurance, no plates, no registration. Seems like I've never done a totally legal first drive ever. IMG_1063.JPG
     
    Erv here..., bobss396 and saltflats like this.

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