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Re: [Fot] Differential Pre-load

To: "TeriAnn J. Wakeman" <tjwakeman@gmail.com>
Subject: Re: [Fot] Differential Pre-load
From: "van.mulders.marcel--- via Fot" <fot@autox.team.net>
Date: Thu, 30 Jan 2020 11:08:14 +0100 (CET)
Cc: fot <fot@autox.team.net>
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Delivered-to: fot@autox.team.net
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Thread-index: KcHDy/iESqGgN3UQ5vDYeGuv4F60kg==
Thread-topic: Differential Pre-load
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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&nbsp; stub axle and brake caliper bracket,&nbsp; 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" &lt;fot@autox.team.net&gt=
;<br><b>Aan: </b>"fot" &lt;fot@autox.team.net&gt;<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">&lt;fot@autox.team.net&gt;</a><br>
          <b>Aan: </b>"fubog1" <a href=3D"mailto:fubog1@aol.com"; target=3D"=
_blank" rel=3D"nofollow noopener noreferrer">&lt;fubog1@aol.com&gt;</a>, "B=
ob Kramer"
          <a href=3D"mailto:rkramer56@gmail.com"; target=3D"_blank" rel=3D"n=
ofollow noopener noreferrer">&lt;rkramer56@gmail.com&gt;</a><br>
          <b>Cc: </b>"fot" <a href=3D"mailto:fot@autox.team.net"; target=3D"=
_blank" rel=3D"nofollow noopener noreferrer">&lt;fot@autox.team.net&gt;</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">&lt;fot@autox.team.net&gt;=
</a> wrote: </div>
              <br>
              <br>
              <div>
                <div id=3D"ydpf5f47a82yiv1894590979">
                  <div>
                    <div dir=3D"ltr">I think the main reason a specified
                      amount of&nbsp; 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.&nbsp; 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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