Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: Hydraulic Throw-out bearing / crank bearing problem
          
   
   

Reply To Thread
Results 1 to 4 of 4
  1. #1
    Ace High is offline CHR Junior sMember Visit my Photo Gallery
    Join Date
    Mar 2018
    Location
    Stoneham
    Posts
    2

    Hydraulic Throw-out bearing / crank bearing problem

     



    Anybody familiar with Hydraulic Throw-Out Bearings. I have a McLoed Racing throw out bearing in my rod. Early Hemi backed up by Muncie 4spd. Trying to find out if the problem I'm having is something others have run into. The Throw-Out bearing was originally set up with approximately 1/8 - 3/16 clearance between the T/O bearing and the pressure plate clutch fingers. (it's a diaphragm type pressure plate.) Well as time went on, the clearance gap closed up and the bearing is constantly against the fingers and is under slight pressure. The problem is that this constant pressure is pushing the crankshaft forward and wearing out the thrust surface on the crankshaft main bearings.
    I've been told that as the clutch "disc" wears, the pressure plate fingers extend backward closing up the clearance gap to the T/O bearing. This doesn't make sense to me. ANY THOUGHTS ?

  2. #2
    34_40's Avatar
    34_40 is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    New Bedford
    Car Year, Make, Model: 34 Ford 3W Coupe Replica
    Posts
    14,606

    Hi, Welcome to the site, it's good to see you here.
    Actually, if you think more about the way the pressure plate and the "fingers" work. It should become more clear.
    They are levers and as the disc wears it becomes more narrow/thin, the lever passes over the fulcrum (pivot point) it will move a greater distance the thinner the disc becomes.

    So there goes your bearing gap/clearance. I had a F-150 4x4 and when I replaced the clutch and related parts I found the internal hydraulic setup was always in contact and was actually spring loaded to keep the bearing in contact with the pressure plate. Just seemed wrong to me but it always worked well.

    Hope it helps.

  3. #3
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,831

    Fix the oil supply to the thrust surfaces of the main bearing, comfirm that all the belt/accessories are alighned up front( misalignment will cause severe end loading on crankshaft) and stop riding the clutch pedal with your foot---------

  4. #4
    Ace High is offline CHR Junior sMember Visit my Photo Gallery
    Join Date
    Mar 2018
    Location
    Stoneham
    Posts
    2

    Changed all bearings. Mic'd the end play gap which is nice at .007. Re-assembled same clutch, -throw out bearing, & transmission , and rear crankshaft end play is "ZERO" as T/O bearing is touching clutch fingers
    Last edited by Ace High; 04-09-2018 at 03:18 AM.

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink