• ken douch
    15 February 2013 at 01:49 #50009

    Have just removed the RH coupling and found the serrations fatigued.
    Only half of the serrations have failed because only half of them transmit drive torque.
    Is a repair feasible ?
    Are there any spares available?

    Attached files

    Mark Whitehead
    27 February 2013 at 21:47 #50031

    Hi Ken,

    I have the parts, but will need to dismantle to check the condition of the teeth.

    Will do so in the next day or two,


    Mark Whitehead
    28 February 2013 at 06:27 #50033

    Hullo Ken,
    I have dismantled the hub carriers that I bought from Ivan Forshaw (Aston Service Dorset) in 1969. the offside inner flange is perfect, the outer is missing one half of an inner tooth.

    Having never mastered the art of putting a photo up on this forum – despite Peter Schirg telling me how to years ago – I will send photos if you wish to your email address.


    ken douch
    28 February 2013 at 18:24 #50039

    Thanks Mark
    I know what you mean about photos; 200 K is smaller than usually taken and either you photo-reduce or set the camera to a small frame size and hope it is a small enough file
    About serrated drives, I wonder how many DBLs are about to fail
    At wheel lock up or wheel spin a torque of about 1000 lb-ft is transmitted. For a 1.575 OD 0.75 ID shaft this calculates to 15.45 KSI
    A spline has 50% area and the serrated version 25% area so the stress can reach 62 KSI . As the hub appears to be a low carbon steel this is asking for problems even under normal driving conditions
    May be we should advise our co-owners to check the tightness of their 3/4 bolts!

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