[Fot] Differential Pre-load

[TeriAnn J. Wakeman]

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>
> *Aan: *"fubog1" <fubog1 at aol.com>, "Bob Kramer" <rkramer56 at gmail.com>
> *Cc: *"fot" <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> 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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