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TeriAnn,
Some years ago, a friend of mine took his freshly restored TR4 to the MOT.
There he was told he had to adjust the front wheel bearings. He tightened these
there and then to pass the MOT and on the way home a stub axle broke off
because the bearing had seized, luckily without too much damage : besides the
stub axle and brake caliper bracket, a wing had to be repaired.
Marcel
Van: "fot" <fot@autox.team.net>
Aan: "fot" <fot@autox.team.net>
Verzonden: Donderdag 30 januari 2020 10:16:08
Onderwerp: Re: [Fot] Differential Pre-load
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
BQ_BEGIN
Van: "fot" [ mailto:fot@autox.team.net | <fot@autox.team.net> ]
Aan: "fubog1" [ mailto:fubog1@aol.com | <fubog1@aol.com> ] , "Bob Kramer" [
mailto:rkramer56@gmail.com | <rkramer56@gmail.com> ]
Cc: "fot" [ mailto: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 [
mailto: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
BQ_END
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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<html><body><div style=3D"font-family: Verdana, Arial, Helvetica, sans-seri=
f; font-size: 10pt; color: #000000"><div><br></div><div>TeriAnn,</div><div>=
Some years ago, a friend of mine took his freshly restored TR4 to the MOT. =
There he was told he had to adjust the front wheel bearings. He tightened t=
hese there and then to pass the MOT and on the way home a stub axle broke o=
ff because the bearing had seized, luckily without too much damage : beside=
s the stub axle and brake caliper bracket, a wing had to be rep=
aired.</div><div>Marcel</div><hr id=3D"zwchr" data-marker=3D"__DIVIDER__"><=
div data-marker=3D"__HEADERS__"><b>Van: </b>"fot" <fot@autox.team.net>=
;<br><b>Aan: </b>"fot" <fot@autox.team.net><br><b>Verzonden: </b>Dond=
erdag 30 januari 2020 10:16:08<br><b>Onderwerp: </b>Re: [Fot] Differential =
Pre-load<br></div><div><br></div><div data-marker=3D"__QUOTED_TEXT__"><div =
class=3D"moz-cite-prefix">On 1/30/20 2:11 AM,
van.mulders.marcel--- via Fot wrote:<br>
</div>
<blockquote>
=20
<div style=3D"font-family:'verdana' , 'arial' , 'helvetica' , sans-se=
rif;font-size:10pt;color:#000000">
<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>
<div style=3D"font-family:'verdana' , 'arial' , 'helvetica' , sans-se=
rif;font-size:10pt;color:#000000">
<div><br>
</div>
<hr id=3D"zwchr">
<div><b>Van: </b>"fot"
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank" rel=3D"no=
follow noopener noreferrer"><fot@autox.team.net></a><br>
<b>Aan: </b>"fubog1" <a href=3D"mailto:fubog1@aol.com"; target=3D"=
_blank" rel=3D"nofollow noopener noreferrer"><fubog1@aol.com></a>, "B=
ob Kramer"
<a href=3D"mailto:rkramer56@gmail.com"; target=3D"_blank" rel=3D"n=
ofollow noopener noreferrer"><rkramer56@gmail.com></a><br>
<b>Cc: </b>"fot" <a href=3D"mailto:fot@autox.team.net"; target=3D"=
_blank" rel=3D"nofollow noopener noreferrer"><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 class=3D"ydpcdfacf56yahoo-style-wrap" style=3D"font-family:'=
helvetica neue' , 'helvetica' , 'arial' , 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" 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.</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Barry</div>
<br>
</div>
<div id=3D"ydpf5f47a82yahoo_quoted_0792558679" class=3D"ydpf5f47a=
82yahoo_quoted">
<div style=3D"font-family:'helvetica neue' , 'helvetica' , 'ari=
al' , sans-serif;font-size:13px;color:#26282a">
<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" rel=3D"nofollow noopener noreferrer"><fot@autox.team.net>=
</a> wrote: </div>
<br>
<br>
<div>
<div id=3D"ydpf5f47a82yiv1894590979">
<div>
<div dir=3D"ltr">I think the main reason a specified
amount of 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. 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 class=3D"ydpf5f47a82yiv1894590979gmail_signa=
ture" 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>
=20
<br>_______________________________________________<br>fot@autox.team.net<b=
r><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.h=
tml<br>Archive: http://autox.team.net/archive http://www.team.net/pipermail=
/fot<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.m=
ulders.marcel@telenet.be<br></div></div></body></html>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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