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Only a post mortem on the parts could tell for sure, but it is fun to specul=
ate. If we take the inspector at his word and the wheel bearing was =E2=80=9C=
loose=E2=80=9D, the question of why that condition existed should have been a=
nswered before tightening down the hub. Either bearing could have already su=
stained damage from misalignment and bringing damaged and scarred rollers ba=
ck to spec could quickly result in overheating and terminal failure.=20
That would not be fun.
Sent from my iPhone
> On Jan 30, 2020, at 4:08 AM, van.mulders.marcel--- via Fot <fot@autox.team=
.net> wrote:
>=20
> =EF=BB=BF
>=20
> 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 t=
hese there and then to pass the MOT and on the way home a stub axle broke of=
f because the bearing had seized, luckily without too much damage : besides t=
he 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
>=20
> 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 pre=
scripion 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 q=
uickly die.
> TeriAnn
>=20
> Van: "fot" <fot@autox.team.net>
> Aan: "fubog1" <fubog1@aol.com>, "Bob Kramer" <rkramer56@gmail.com>
> Cc: "fot" <fot@autox.team.net>
> Verzonden: Woensdag 29 januari 2020 19:02:55
> Onderwerp: Re: [Fot] Differential Pre-load
>=20
> 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 do=
es need to be some 'squeeze" between the bearing races and the rollers or th=
e rollers will not roll in lubrication. If any of you have ever rebuilt the r=
ear outer suspension on old XKEs, the tapers roller bearing in the outer wis=
hbone pivots wear out because the wishbone only moves up and down a few degr=
ees. The tapered roller bearings never fully rotate and cause the rollers an=
d race to pit. Roller bearing must roll 360 degrees around to survive. Prelo=
ad makes them do that.
>=20
> Barry
>=20
> On Wednesday, January 29, 2020, 09:41:34 AM EST, Bob Kramer via Fot <fot@a=
utox.team.net> wrote:
>=20
>=20
> 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 th=
e components slide over each other. Too loose and they cock in place. Witho=
ut rolling, bearings will soon fail the same way a lifter that doesn't spin f=
ails.
>=20
> Bob Kramer
>=20
>=20
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.mulders.=
marcel@telenet.be
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rkramer56@gm=
ail.com
>=20
>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Only a post mortem on the parts could tell f=
or sure, but it is fun to speculate. If we take the inspector at his word an=
d the wheel bearing was =E2=80=9Cloose=E2=80=9D, the question of why that co=
ndition existed should have been answered before tightening down the hub. Ei=
ther bearing could have already sustained damage from misalignment and bring=
ing damaged and scarred rollers back to spec could quickly result in overhea=
ting and terminal failure. <div><br></div><div>That would not be fun.<b=
r><br><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blockq=
uote type=3D"cite">On Jan 30, 2020, at 4:08 AM, van.mulders.marcel--- via Fo=
t <fot@autox.team.net> wrote:<br><br></blockquote></div><blockquote ty=
pe=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div style=3D"font-family: Verdana, Ar=
ial, Helvetica, sans-serif; font-size: 10pt; color: #000000"><div><br></div>=
<div>TeriAnn,</div><div>Some years ago, a friend of mine took his freshly re=
stored TR4 to the MOT. There he was told he had to adjust the front wheel be=
arings. He tightened these there and then to pass the MOT and on the way hom=
e a stub axle broke off because the bearing had seized, luckily without too m=
uch damage : besides the stub axle and brake caliper bracket, a w=
ing had to be repaired.</div><div>Marcel</div><hr id=3D"zwchr" data-marker=3D=
"__DIVIDER__"><div data-marker=3D"__HEADERS__"><b>Van: </b>"fot" <fot@aut=
ox.team.net><br><b>Aan: </b>"fot" <fot@autox.team.net><br><b>Verzon=
den: </b>Donderdag 30 januari 2020 10:16:08<br><b>Onderwerp: </b>Re: [Fot] D=
ifferential Pre-load<br></div><div><br></div><div data-marker=3D"__QUOTED_TE=
XT__"><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-ser=
if;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-ser=
if;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"nof=
ollow 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>, "Bob=
Kramer"
<a href=3D"mailto:rkramer56@gmail.com"; target=3D"_blank" rel=3D"no=
follow 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><b=
r>
<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:'h=
elvetica 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"ydpf5f47a8=
2yahoo_quoted">
<div style=3D"font-family:'helvetica neue' , 'helvetica' , 'aria=
l' , 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 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.
<div><br clear=3D"all">
<div>
<div class=3D"ydpf5f47a82yiv1894590979gmail_signat=
ure" 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<br=
><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.htm=
l<br>Archive: http://autox.team.net/archive http://www.team.net/pipermail/fo=
t<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.mulde=
rs.marcel@telenet.be<br></div></div><span>__________________________________=
_____________</span><br><span>fot@autox.team.net</span><br><span></span><br>=
<span>http://www.fot-racing.com</span><br><span></span><br><span>Donate: htt=
p://www.team.net/donate.html</span><br><span>Archive: http://autox.team.net/=
archive http://www.team.net/pipermail/fot</span><br><span>Unsubscribe/Manage=
: http://autox.team.net/mailman/options/fot/rkramer56@gmail.com</span><br><s=
pan></span><br><span></span><br></div></blockquote></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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