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spring perch question

Discussion in 'The Hokey Ass Message Board' started by 61bone, Sep 29, 2009.

  1. 61bone
    Joined: Feb 12, 2005
    Posts: 890

    61bone
    Member

    On front spring perches, there is a tapered shoulder on the bolt at the top and a cone washer on the bottom. Why is that?
     
  2. F&J
    Joined: Apr 5, 2007
    Posts: 13,223

    F&J
    Member

    It's the only way to keep the perch bolt tight with all the forces on it. Just like cones on a lug nut.
     
  3. 325w
    Joined: Feb 18, 2008
    Posts: 5,608

    325w
    ALLIANCE MEMBER

    What he said.
     
  4. 61bone
    Joined: Feb 12, 2005
    Posts: 890

    61bone
    Member

    Sounds reasonable. Thanks
     

  5. drbuck62
    Joined: Jan 12, 2009
    Posts: 23

    drbuck62
    Member

    Can I steal your phrase "Just like cones on a lug nut"? Seems I know some lug nuts without cones, hmmm...
     
  6. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    pasadenahotrod
    Member
    from Texas

    The taper of the top of the perch and the nut on the bottom fit into the matching taper of the wishbone knuckles and keep the wishbone solidly centered and in position on the axle. This solid style of mounting eliminates wear unless the perch nut is loose or the perch has been bent and stretched so slop is possible.
     
  7. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    Yes, exactly. Think about a simple straight bolt being strongly shoved laterally with spring movent and getting multiple fore&aft forces when brakes are applied...it would not last long. Bolts are not right for properly designed locating and lateral force situations, which as why there are so many dowel pinned or otherwise designed locating systems on critical bolted parts. The cones have much the same function, to solidly locate and to resist forces not controllable by the linear clamping that bolts do.
     
  8. VAPHEAD
    Joined: May 13, 2002
    Posts: 3,257

    VAPHEAD
    BANNED

    guessing you have aftermarket perch pins (bolts)
    you can replace the coned washers on the bottom with the correct tapered nut.
    cheap,$5.00 pr ??
     
  9. mottsrods
    Joined: Jul 9, 2008
    Posts: 742

    mottsrods
    Member

    Sounds like 'Man-Boobs'.....or 'Moobs'
     
  10. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    pasadenahotrod
    Member
    from Texas

    Why is it, do you think, that the makers of the new perches don't make their own correct tapered castellated perch nuts or simply supply new ones from theanttique parts market with their perches rather than sending a tapered WASHER with them?
     

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