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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@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@autox.team.net> <fot@autox.team.net>
> *Aan: *"fubog1" <fubog1@aol.com> <fubog1@aol.com>, "Bob Kramer"
> <rkramer56@gmail.com> <rkramer56@gmail.com>
> *Cc: *"fot" <fot@autox.team.net> <fot@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@autox.team.net> <fot@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
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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>
>
>
--000000000000a6fb94059d5af39d
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Same answer as the diff. Too tight and the rollers are pre=
ssed too hard against=C2=A0the race, causing one radii edge of the roller b=
earing to slide continuously over the race. Too loose and the rollers are n=
ot kept in alignment and can and will roll at an angle (cocked) and wear qu=
ickly, eventually locking in a cocked position prior to catastrophic failur=
e.=C2=A0 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&#=
39;s your uncle.<div><br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail=
_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr">Bob Kramer<=
/div></div></div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Thu, Jan 30, 2020 at 3:16 AM TeriAnn J. Wakem=
an via Fot <<a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>=
> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
=20
=20
=20
<div>
<div>On 1/30/20 2:11 AM,
van.mulders.marcel--- via Fot wrote:<br>
</div>
<blockquote type=3D"cite">
=20
<div style=3D"font-family:Verdana,Arial,Helvetica,sans-serif;font-siz=
e:10pt;color:rgb(0,0,0)">
<div>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?</div>
<div>Marcel</div>
</div>
</blockquote>
Likewise with Series Land Rover wheel bearings. Leave them tight and
they quickly die.<br>
TeriAnn<br>
<blockquote type=3D"cite">
<div style=3D"font-family:Verdana,Arial,Helvetica,sans-serif;font-siz=
e:10pt;color:rgb(0,0,0)">
<div><br>
</div>
<hr id=3D"gmail-m_2461877812248277208zwchr">
<div><b>Van: </b>"fot"
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank"><fot@a=
utox.team.net></a><br>
<b>Aan: </b>"fubog1" <a href=3D"mailto:fubog1@aol.com"; =
target=3D"_blank"><fubog1@aol.com></a>, "Bob Kramer"
<a href=3D"mailto:rkramer56@gmail.com"; target=3D"_blank"><rkra=
mer56@gmail.com></a><br>
<b>Cc: </b>"fot" <a href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank"><fot@autox.team.net></a><br>
<b>Verzonden: </b>Woensdag 29 januari 2020 19:02:55<br>
<b>Onderwerp: </b>Re: [Fot] Differential Pre-load<br>
</div>
<div><br>
</div>
<div>
<div style=3D"font-family:"helvetica neue",helvetica,ar=
ial,sans-serif;font-size:13px">
<div dir=3D"ltr">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" betw=
een
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.</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Barry</div>
<br>
</div>
<div id=3D"gmail-m_2461877812248277208ydpf5f47a82yahoo_quoted_079=
2558679">
<div style=3D"font-family:"helvetica neue",helvetica,=
arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
<div> On Wednesday, January 29, 2020, 09:41:34 AM EST, Bob
Kramer via Fot <a href=3D"mailto:fot@autox.team.net"; target=
=3D"_blank"><fot@autox.team.net></a> wrote: </div>
<br>
<br>
<div>
<div id=3D"gmail-m_2461877812248277208ydpf5f47a82yiv1894590=
979">
<div>
<div dir=3D"ltr">I think the main reason a specified
amount of=C2=A0 preload is required is that it sets i=
t
up so that the bearings roll under mild tension.
To tight and the components slide over each
other.=C2=A0 Too loose and they cock in place. Withou=
t
rolling, bearings will soon fail the same way a
lifter that doesn't spin fails.
<div><br clear=3D"all">
<div>
<div dir=3D"ltr">
<div dir=3D"ltr">Bob Kramer</div>
</div>
</div>
<br clear=3D"none">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
</div>
_______________________________________________<br>
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
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<br>
<br>
</blockquote></div>
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