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Technical Flathead Clutch questions

Discussion in 'The Hokey Ass Message Board' started by Russco, Jul 4, 2021.

  1. Russco
    Joined: Nov 27, 2005
    Posts: 4,327

    Russco
    Member
    from Central IL

    Helping my brother with his ‘40 coupe. When we bolt the pressure plate to the flywheel as the pressure plate mates up to the flywheel the 3 fingers on the pressure plate draw in and then there isn’t t any travel left for the throw out bearing to disengage the clutch. I don’t know any specifics on the clutch parts other than it’s a 10” disc and the pressure plate appears to be the correct size for the disc and flywheel. There is about a .250” gap if you just hold the pressure plate against the flywheel with the disc in place. It seems like shimming the pressure plate out would probably solve the issue but how much would you need to shim it to still have the clamping force needed to engage the clutch? Do he have the wrong part combination or are there spacers used we don’t have?
    It seems like I’ve had Flathead clutch’s in the past that have had spacers between the cover and the flywheel. Anyone ever run across this before? Thanks in advance.
     
  2. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,678

    Jmountainjr
    ALLIANCE MEMBER

    I guess my first question would be are you sure that the disk is installed correctly?
     
    alanp561 likes this.
  3. Russco
    Joined: Nov 27, 2005
    Posts: 4,327

    Russco
    Member
    from Central IL

    Yes it’s facing the correct direction
     
  4. v8flat44
    Joined: Nov 13, 2017
    Posts: 1,211

    v8flat44

    Russco, post this on The Ford Barn too. I have never had this happen to me ??
     
    Russco likes this.

  5. Russco
    Joined: Nov 27, 2005
    Posts: 4,327

    Russco
    Member
    from Central IL

    Thanks I’ll do that too, I haven’t messed with flattie’s for a good while, but seems like there was a certain combination of disc, pressure plate or something I went through in the past on my old coupe. He bought this and it was assembled but the trans was messed up. I fixed the transmission and now the clutch is wrong. We don’t have any idea what flywheel/disc/pressure plate it is other than it all seems to bolt together as it should.
     
  6. 51504bat
    Joined: May 22, 2010
    Posts: 4,794

    51504bat
    ALLIANCE MEMBER

  7. alchemy
    Joined: Sep 27, 2002
    Posts: 20,522

    alchemy
    Member

    I've never seen spacers used between the flywheel and pressure plate. Maybe the disk is too thick. From the wrong application?
     
    Desoto291Hemi likes this.
  8. weathrmn
    Joined: Apr 15, 2008
    Posts: 321

    weathrmn
    Member

    Make sure the clutch and pressure plate is correct for the application. Use no spacers. I had a simaliar problem with my 40 Ford with a Merc Flat head. After I spoke with Fort Wayne Clutch, turned out the transmission case was from a 6 cylinder flat head truck. Bought a new set from Fort Wayne (and a v8 trans) and no problems. I highly recommend Fort Wayne Clutch
     
  9. 19Fordy
    Joined: May 17, 2003
    Posts: 8,056

    19Fordy
    Member

    Stock 40's came with a 9 inch clutch. What engine is in your brother's 40?

    You first need to find out what year vehicle your pressure plate, clutch and throwout bearing are made to fit as there are different combinations that may or may not fit your 40 Ford. Read through these threads:
    https://www.fordbarn.com/forum/search.php?searchid=23873880
     
    Last edited: Jul 5, 2021
    Atwater Mike likes this.

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