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Cylinder head hardware

Discussion in 'Norton Commando Motorcycles (Classic)' started by Dean, Jun 12, 2019.

  1. Dean

    Dean

    Joined:
    Jul 26, 2014
    Hi all

    Can anyone confirm that the cylinder head nut that comes up from the underside of the barrel at the back has no washer. Is this correct?

    Thanks
    D
     
  2. Peter R

    Peter R

    Joined:
    Dec 13, 2010
    Correct, no washers indeed.
     
  3. Dean

    Dean

    Joined:
    Jul 26, 2014
    Thanks
     
  4. rvich

    rvich VIP MEMBER

    Joined:
    Jul 25, 2009
    It has been argued that the washer was left off in order to get enough threads into the nut to achieve 30 pounds of torque. The same argument suggested that custom studs should be made that are slightly longer (4mm) in order to accommodate a washer in this location. The same stud could be made a bit longer where it goes into the alloy to help achieve the torque without tearing out. It's common to find Helicoils in this location.

    There are old threads about this somewhere.
     
  5. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Really,! so what is the folk lore regarding the lack of washers on the sleeve nuts?

    Bit puzzled that the threads often fail.....but you can't apply enough torque?

    Never mind, if there were washers specified I don't suppose I could guarantee to get one in there whilst juggling the nut on my fingertip!
     
    Hortons Norton likes this.
  6. rvich

    rvich VIP MEMBER

    Joined:
    Jul 25, 2009
    Below is a stock stud with nut...

    IMG_2044.jpg

    And now a longer stud with nut and washer...

    IMG_2043.jpg

    Which one appeals most to your sense of mechanical aesthetics?
     
  7. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Joined:
    Dec 3, 2012
    To some degree that might depend on how much stud is engaged into the nut verses the stud diameter on the OEM set up.... but I prefer the later.

    Is that longer stud an off the shelf item ?

    These are very good on ferrous metal to metal ....... if the stud was long enough. :D
    https://schnorr.com/products/safety-washers/
     
    Last edited: Jun 13, 2019
  8. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    How do we get this longer Stud. We are all interested. Girls and Guys.
     
  9. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
    Can the head be removed while in the bike with the longer stud?
     
  10. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Good question.
     
    texasSlick likes this.
  11. rvich

    rvich VIP MEMBER

    Joined:
    Jul 25, 2009
    The longer stud idea is from old conversations here in this forum. I used my old head bolts (3/8" X 26 tpi) to make the studs. I've had my head off with the longer stud without removing the engine from the frame.

    Edit: I may have removed the front iso bolt to give extra clearance when removing the head.
     
    Last edited: Jun 14, 2019
  12. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
    Thanks, good to know.
    I’m going through a Combat right now.
    And yes, your’s has much better ‘Mechanical Aesthetics.’
     

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