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Technical diaphragm pressure plate

Discussion in 'The Hokey Ass Message Board' started by rustymetal, Jul 20, 2020.

  1. rustymetal
    Joined: Feb 18, 2003
    Posts: 536

    rustymetal
    Member

    looking for a diaphragm pressure plate that will bolt to ford 1952 flathead flywheel.
    like to have a part # might be able to buy at local part house thanks
     
  2. sdluck
    Joined: Sep 19, 2006
    Posts: 2,702

    sdluck
    Member

  3. 42merc
    Joined: Dec 19, 2010
    Posts: 754

    42merc
    Member

    SDLUCK asks.
    More info needed what spline and size,but start looking here

    Stock '52 Ford would be a 9 1/2" Long style pressure plate. At this stage, don't care about "spline".
     
  4. krylon32
    Joined: Jan 29, 2006
    Posts: 7,200

    krylon32
    Alliance Vendor
    from Nebraska

    Part number was CA30. 51/52 Truck PP
     
    Last edited: Jul 20, 2020

  5. jimmy six
    Joined: Mar 21, 2006
    Posts: 8,757

    jimmy six
    Member

    I’m not sure that a Ford ever used anything other than a Long bolt pattern on their flywheels then or if there is a diaphragm with that pattern but you could have a standard GM diaphragm pattern drilled into yours. A good machine shop can do this. Do remember that the diaphragm style pressure plate comes off the flywheel at a 90* angle where the long is near 45* angle so you may need a smaller diameter to clear your bell housing That may not affect the Ford flathead.
     
  6. rusty valley
    Joined: Oct 25, 2014
    Posts: 2,438

    rusty valley
    Member

    this just came up on the fordbarn recently. from that, it was thought that there is no diaphragm style that works with a known throw out bearing for the stock ford.
     
  7. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,750

    V8 Bob
    ALLIANCE MEMBER

    I know there are some diaphragm pressure plates that directly replace Longs. Check out your NAPA or your local clutch re-builder.
    The '49-'53 Mercury flywheels are drilled for Borg & Beck plates which have the same evenly spaced bolt pattern as common GM diaphragms.
    Diaphragms have two designs; straight finger for large inputs and T/O bearings, and bent finger for smaller inputs and T/O bearings, like the one pictured below on my '32s flathead using a stock '51 Mercury T/O bearing, which is basically the same bearing as '49-'53 Ford/'51-'53 Mercury car.
    upload_2020-7-21_8-14-48.jpeg
     
  8. rusty valley
    Joined: Oct 25, 2014
    Posts: 2,438

    rusty valley
    Member

    Bob, yes, the mercs came with the borg an beck, but is there one for a pre 8ba motor?
     
  9. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,750

    V8 Bob
    ALLIANCE MEMBER

    The pre-8BAs used Long style plates, both Ford and Merc. Your choice is re-drilling the flywheel for a B&B/diaphragm plate, or use an aftermarket flywheel that are usually drilled for Long and B&B/diaphragm bolt patterns.
     
    Desoto291Hemi likes this.
  10. Redrilling the flywheel is a slam dunk for any machine shop. A guy could do it at home with a drill press if he was at all proficient at measuring.
     
  11. ekimneirbo
    Joined: Apr 29, 2017
    Posts: 1,848

    ekimneirbo
    Member
    from Brooks Ky

    Call Kentucky Clutch 502 955 9173 around noon and ask for Dave. He's the retired former owner and works there at lunch time. Good people and good prices and they ship everywhere.. He knows everything about clutches.
     
  12. Fordors
    Joined: Sep 22, 2016
    Posts: 3,463

    Fordors
    Member

    I’m not a late model Ford guy but I believe they do use the Long style bolt pattern on pressure plates and flywheels.
     
  13. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,750

    V8 Bob
    ALLIANCE MEMBER

    Ford stopped using the Long pressure plate in the '70s when they switched to the diaphragm.
     
  14. Fordors
    Joined: Sep 22, 2016
    Posts: 3,463

    Fordors
    Member

    @V8 Bob , I agree, but I think they have the Long bolt pattern on their clutches. B3E204C1-075C-4A2F-A01D-F1003F0BDD31.jpeg

    The photo is of a clutch job in a 1993 F150, it shows two bolts close together in three pairs, Long style. F150 might be too big but maybe a Ranger pickup clutch would work.
     
    Last edited: Jul 22, 2020
  15. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,750

    V8 Bob
    ALLIANCE MEMBER

    I know that Ford used a Long style bolt pattern on some of their diaphragms, just not sure if the dimensions are the same as the older Longs. Finger height is also another critical dimension.
     

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