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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 anticipate=
d (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 out=
er wishbone pivots wear out because the wishbone only moves up and down a f=
ew degrees. The tapered roller bearings never fully rotate and cause the ro=
llers and race to pit. Roller bearing must roll 360 degrees around to survi=
ve. Preload makes them do that.
Barry
On Wednesday, January 29, 2020, 09:41:34 AM EST, Bob Kramer via Fot <fo=
t@autox.team.net> wrote: =20
=20
I think the main reason a specified amount of=C2=A0 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.=C2=A0 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
On Wed, Jan 29, 2020 at 8:15 AM fubog1 via Fot <fot@autox.team.net> wrote:
=20
Does someone know why that preload is necessary?=20
Yes it's basically because things want to move around a lot & the pinion w=
ants to stretch.with torque on/off loads.Over time as the bearings wear, th=
e preload will be lost, and any further wear will cause the gears to be out=
of mesh and the pattern will be lost and then they'll wear.Glen
=20
-----Original Message-----
From: van.mulders.marcel--- via Fot <fot@autox.team.net>
To: Bill Tobin <william.tobin31@verizon.net>
Cc: fot <fot@autox.team.net>
Sent: Wed, Jan 29, 2020 8:14 am
Subject: Re: [Fot] Differential Pre-load
Does someone know why that preload is necessary? When I check a differentia=
l before using it and I notice there is almost no preload at all, I tend to=
be lazy, assuming no preload means less friction loss.Marcel.
Van: "fot" <fot@autox.team.net>
Aan: "fot" <fot@autox.team.net>
Verzonden: Woensdag 29 januari 2020 04:06:57
Onderwerp: Re: [Fot] Differential Pre-load
Hi Scott I think that's the torque required to turn the pinion. Put a socke=
t to fit the pinion nut on a?? inch pound torque wrench; measure how much t=
orque it takes to turn the pinion. Get it turning and read the torque wrenc=
h while turning it. 12 to 15 inch pounds sounds ok. With shims either add o=
r remove shims to get the correct preload. Thicker to lessen and thinner to=
increase I think. With a collapsible spacer it's easier. Keep?? tightening=
the nut and measuring the preload until it's right. Small increments. If y=
ou over tighten you take it apart and start over with a new spacer. (Ask me=
how I know this!) Also a "clicker" torque wrench isn't the ticket for this=
. Use an older beam type.
Hope this helps. Cheers Bill
On 1/28/2020 4:34 PM, Scott Janzen via Fot wrote:
=20
I???m rebuilding my differential. ??The manual says the pinion bearings sh=
ould be assembled with spacers to yield a?? 12-16 lb/inch pre-load, using a=
bar affixed to the input flange and a sliding weight. ??Of course there is=
a churchhill tool for that!=20
Either I???m not grasping the concept, or 12 lbs per inch doesn???t seem =
right. ??I???m guessing this is supposed to be 12 inch-pounds, which I thin=
k means a one pound weight at the end of a 12??? lever. ??All testing is pe=
rformed with the seal removed.=20
Even if I am correct, I???ve got it set up with about a 1/2 lb pre-load r=
ight now, and that feels pretty stiff already.=20
Anyone have any experience with this? ??This is a GT6 diff, but I???m gue=
ssing the instructions don???t vary much.=20
Thanks, Scott=20
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
31@verizon.net
=20
=20
_______________________________________________
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Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
arcel@telenet.be
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http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
m
_______________________________________________
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http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
il.com
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Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
south.net
=20
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<html><head></head><body><div class=3D"ydpcdfacf56yahoo-style-wrap" style=
=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 1=
3px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Preload is more for the life=
of the bearings than the gears. You preload a bearing to take up manufactu=
ring 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 b=
ecause the wishbone only moves up and down a few degrees. The tapered rolle=
r 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 tha=
t.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" d=
ata-setdir=3D"false">Barry</div><div><br></div>
=20
</div><div id=3D"ydpf5f47a82yahoo_quoted_0792558679" class=3D"ydpf5=
f47a82yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Wednesday, January 29, 2020, 09:41:34 AM EST, Bob Kr=
amer via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydpf5f47a82yiv1894590979"><div><div dir=3D"=
ltr">I think the main reason a specified amount of preload is require=
d is that it sets it up so that the bearings roll under mild tension. To ti=
ght 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 t=
hat doesn't spin fails.<div><br clear=3D"all"><div><div class=3D"ydpf5f47a8=
2yiv1894590979gmail_signature" dir=3D"ltr"><div dir=3D"ltr">Bob Kramer</div=
></div></div><br clear=3D"none"></div></div><br clear=3D"none"><div class=
=3D"ydpf5f47a82yiv1894590979gmail_quote"><div class=3D"ydpf5f47a82yiv189459=
0979yqt6108547910" id=3D"ydpf5f47a82yiv1894590979yqt53328"><div class=3D"yd=
pf5f47a82yiv1894590979gmail_attr" dir=3D"ltr">On Wed, Jan 29, 2020 at 8:15 =
AM fubog1 via Fot <<a shape=3D"rect" href=3D"mailto:fot@autox.team.net"; =
rel=3D"nofollow" target=3D"_blank">fot@autox.team.net</a>> wrote:<br cle=
ar=3D"none"></div><blockquote class=3D"ydpf5f47a82yiv1894590979gmail_quote"=
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex;">
<div style=3D"color: black; font-style: normal; font-weight: normal; font-s=
tretch: normal; font-size: 10pt; line-height: normal; font-family: Arial, H=
elvetica, sans-serif;">
<div> <br clear=3D"none">
</div>
<div style=3D"font-family:arial, helvetica;font-size:10pt;color:black;"><bl=
ockquote style=3D"border-left:2px solid blue;padding-left:3px;">Does someon=
e know why that preload is necessary? </blockquote></div>
<div> <font size=3D"2">Yes it's basically because things want to move aroun=
d a lot </font><font size=3D"2"><font size=3D"2">& the pinion wants to =
stretch.</font>with torque on/off loads.</font></div>
<div><font size=3D"2">Over time as the bearings wear, the preload will be l=
ost, and any further wear will cause the gears to be out of mesh and the pa=
ttern will be lost and then they'll wear.</font></div>
<div><font size=3D"2">Glen<br clear=3D"none">
</font></div>
<div><font size=3D"2"><br clear=3D"none">
</font></div>
<div> <br clear=3D"none">
</div>
<div style=3D"font-family:arial, helvetica;font-size:10pt;color:black;">---=
--Original Message-----<br clear=3D"none">
From: van.mulders.marcel--- via Fot <<a shape=3D"rect" href=3D"mailto:fo=
t@autox.team.net" rel=3D"nofollow" target=3D"_blank">fot@autox.team.net</a>=
><br clear=3D"none">
To: Bill Tobin <<a shape=3D"rect" href=3D"mailto:william.tobin31@verizon=
.net" rel=3D"nofollow" target=3D"_blank">william.tobin31@verizon.net</a>>=
;<br clear=3D"none">
Cc: fot <<a shape=3D"rect" href=3D"mailto:fot@autox.team.net"; rel=3D"nof=
ollow" target=3D"_blank">fot@autox.team.net</a>><br clear=3D"none">
Sent: Wed, Jan 29, 2020 8:14 am<br clear=3D"none">
Subject: Re: [Fot] Differential Pre-load<br clear=3D"none">
<br clear=3D"none">
<div id=3D"ydpf5f47a82yiv1894590979gmail-m_-29625174874098953yiv6457723921"=
>
<div>
<div style=3D"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:1=
0pt;color:rgb(0,0,0);">
<div>Does someone know why that preload is necessary? When I check a differ=
ential before using it and I notice there is almost no preload at all, I te=
nd to be lazy, assuming no preload means less friction loss.</div>
<div>Marcel.</div>
<div><br clear=3D"none"></div>
<hr id=3D"ydpf5f47a82yiv1894590979gmail-m_-29625174874098953yiv6457723921zw=
chr">
<div id=3D"ydpf5f47a82yiv1894590979gmail-m_-29625174874098953yiv6457723921y=
qtfd62075">
<div><b>Van: </b>"fot" <<a shape=3D"rect" href=3D"mailto:fot@autox.team.=
net" rel=3D"nofollow" target=3D"_blank">fot@autox.team.net</a>><br clear=
=3D"none"><b>Aan: </b>"fot" <<a shape=3D"rect" href=3D"mailto:fot@autox.=
team.net" rel=3D"nofollow" target=3D"_blank">fot@autox.team.net</a>><br =
clear=3D"none"><b>Verzonden: </b>Woensdag 29 januari 2020 04:06:57<br clear=
=3D"none"><b>Onderwerp: </b>Re: [Fot] Differential Pre-load<br clear=3D"non=
e"></div>
<div><br clear=3D"none"></div>
</div>
<div>
<div id=3D"ydpf5f47a82yiv1894590979gmail-m_-29625174874098953yiv6457723921y=
qtfd34314">
<div>Hi Scott I think that's the torque required to turn the pinion.
Put a socket to fit the pinion nut on a?? inch pound torque wrench;
measure how much torque it takes to turn the pinion. Get it
turning and read the torque wrench while turning it. 12 to 15 inch
pounds sounds ok. With shims either add or remove shims to get the
correct preload. Thicker to lessen and thinner to increase I
think.</div>
=20
<div>With a collapsible spacer it's easier. Keep?? tightening the nut
and measuring the preload until it's right. Small increments. If
you over tighten you take it apart and start over with a new
spacer. (Ask me how I know this!)</div>
=20
<div>Also a "clicker" torque wrench isn't the ticket for this. Use an
older beam type.<br clear=3D"none">
</div>
=20
<div>Hope this helps.</div>
=20
<div>Cheers Bill<br clear=3D"none">
</div>
=20
<div>On 1/28/2020 4:34 PM, Scott Janzen via
Fot wrote:<br clear=3D"none">
</div>
<blockquote>
=20
I???m rebuilding my differential. ??The manual says the pinion
bearings should be assembled with spacers to yield a??
=20
<div><u>12-16 lb/inch pre-load,</u> using a bar
affixed to the input flange and a sliding weight. ??Of course
there is a churchhill tool for that!</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>Either I???m not grasping the concept, or 12 lbs <u>per</u> inch doesn=
???t seem right. ??I???m guessing this
is supposed to be 12 inch-pounds,</div>
=20
<div>which I think means a one pound weight at the end of
a 12??? lever. ??All testing is performed with the seal removed.</d=
iv>
=20
<div><br clear=3D"none">
</div>
=20
<div>Even if I am correct, I???ve got it set up with about
a 1/2 lb pre-load right now, and that feels pretty stiff
already.</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>Anyone have any experience with this? ??This is a GT6
diff, but I???m guessing the instructions don???t vary much.</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>Thanks,</div>
=20
<div>Scott</div>
<br clear=3D"none">
<fieldset></fieldset>
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