[Fot] Differential Pre-load

[Bob Kramer]

Same answer as the diff. Too tight and the rollers are pressed too hard
against the race, causing one radii edge of the roller bearing to slide
continuously over the race. Too loose and the rollers are not kept in
alignment and can and will roll at an angle (cocked) and wear quickly,
eventually locking in a cocked position prior to catastrophic failure.  Set
them up right and there is mild tension on both the outer and inner
rollers, friction causes them to roll over the race surface and Bob's your
uncle.

Bob Kramer


On Thu, Jan 30, 2020 at 3:16 AM TeriAnn J. Wakeman via Fot <
fot at autox.team.net> wrote:

> On 1/30/20 2:11 AM, van.mulders.marcel--- via Fot wrote:
>
> Barry, if that is true about the rollers/races, how do you explain the
> prescripion about the front wheel bearings : you need to back off the stub
> axle nut to get some play for the bearings?
> Marcel
>
> Likewise with Series Land Rover wheel bearings. Leave them tight and they
> quickly die.
> TeriAnn
>
>
> ------------------------------
> *Van: *"fot" <fot at autox.team.net> <fot at autox.team.net>
> *Aan: *"fubog1" <fubog1 at aol.com> <fubog1 at aol.com>, "Bob Kramer"
> <rkramer56 at gmail.com> <rkramer56 at gmail.com>
> *Cc: *"fot" <fot at autox.team.net> <fot at autox.team.net>
> *Verzonden: *Woensdag 29 januari 2020 19:02:55
> *Onderwerp: *Re: [Fot] Differential Pre-load
>
> Preload is more for the life of the bearings than the gears. You preload a
> bearing to take up manufacturing tolerances and account for the anticipated
> (by the manufacturer of the bearings) wear during their life time. There
> does need to be some 'squeeze" between the bearing races and the rollers or
> the rollers will not roll in lubrication. If any of you have ever rebuilt
> the rear outer suspension on old XKEs, the tapers roller bearing in the
> outer wishbone pivots wear out because the wishbone only moves up and down
> a few degrees. The tapered roller bearings never fully rotate and cause the
> rollers and race to pit. Roller bearing must roll 360 degrees around to
> survive. Preload makes them do that.
>
> Barry
>
> On Wednesday, January 29, 2020, 09:41:34 AM EST, Bob Kramer via Fot
> <fot at autox.team.net> <fot at autox.team.net> wrote:
>
>
> I think the main reason a specified amount of  preload is required is that
> it sets it up so that the bearings roll under mild tension. To tight and
> the components slide over each other.  Too loose and they cock in place.
> Without rolling, bearings will soon fail the same way a lifter that doesn't
> spin fails.
>
> Bob Kramer
>
>
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