how do I set up tapered roller bearings?

Discussion in 'Motorbike Technical Discussion' started by Charlie, Jul 29, 2005.

  1. Charlie

    Charlie Guest

    I have a pair of tapered roller bearings and races to replaces the worn out
    steering head bearings on my CBR600.

    There was no documentation with the bearings; how do I set them up in terms
    of preload or torque?? I don't wanna over or under tighten them and shorten
    their lifespan.


    Charlie, Jul 29, 2005
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  2. You can initially torque the steering stem nut to 29 to 36 foot pounds
    to seat the bearings. This is the procedure from my GSXR-750 manual.

    Work the lower steering bracket side to side several times to be sure
    there is no excess play anywhere in the rotation.

    Then back off the steering stem nut 1/4 to 1/2 turn and retorque the
    bearing to somewhere between 21.5 and 29.0 foot pounds. If you just
    torque to 21.5 foot pounds initially, you can just torque the steering
    stem nut more to get the initial turning force in the middle of the
    range specified below.

    Attach a fish scale to the end of the handlebar, and check to see how
    much force it takes to start turning the bars with the front wheel off
    the ground. It should between 200 and 500 grams (4 ounces to 18
    ounces). You can then adjust the torque on the steering stem nut until
    you get in the middle of that range (350 grams or 11 ounces).

    As a final check, grab the fork leg and try to move it back and forth
    from front to rear. You shouldn't feel any slop.
    krusty kritter, Jul 30, 2005
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