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Does someone know why that preload is necessary?
Yes it's basically because things want to move around a lot & the pinion wants
to stretch.with torque on/off loads.Over time as the bearings wear, the 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
-----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 differential
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 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. 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!)
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:
I???m rebuilding my differential. ??The manual says the pinion bearings should
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!
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 think
means a one pound weight at the end of a 12??? lever. ??All testing is
performed with the seal removed.
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.
Anyone have any experience with this? ??This is a GT6 diff, but I???m
guessing the instructions don???t vary much.
Thanks, Scott
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<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><bloc=
kquote style=3D"border-left: 2px solid blue; padding-left: 3px;">Does someo=
ne 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>
</font></div>
<div><font size=3D"2"><br>
</font></div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: van.mulders.marcel--- via Fot <fot@autox.team.net><br>
To: Bill Tobin <william.tobin31@verizon.net><br>
Cc: fot <fot@autox.team.net><br>
Sent: Wed, Jan 29, 2020 8:14 am<br>
Subject: Re: [Fot] Differential Pre-load<br>
<br>
<div id=3D"yiv6457723921">
<div>
<div style=3D"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:1=
0pt;color:#000000;">
<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"yiv6457723921zwchr">
<div class=3D"yiv6457723921yqt3701688517" id=3D"yiv6457723921yqtfd62075">
<div><b>Van: </b>"fot" <fot@autox.team.net><br clear=3D"none"><b>Aan:=
</b>"fot" <fot@autox.team.net><br clear=3D"none"><b>Verzonden: </b>W=
oensdag 29 januari 2020 04:06:57<br clear=3D"none"><b>Onderwerp: </b>Re: [F=
ot] Differential Pre-load<br clear=3D"none"></div>
<div><br clear=3D"none"></div>
</div>
<div>
<div class=3D"yiv6457723921yqt3701688517" id=3D"yiv6457723921yqtfd34314">
<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 class=3D"yiv6457723921moz-cite-prefix">On 1/28/2020 4:34 PM, Scott Jan=
zen 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 class=3D"yiv6457723921"><u class=3D"yiv6457723921">12-16 lb/inch pre-l=
oad,</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 class=3D"yiv6457723921"><br class=3D"yiv6457723921" clear=3D"none">
</div>
=20
<div class=3D"yiv6457723921">Either I???m not grasping the concept, or 12 l=
bs <u class=3D"yiv6457723921">per</u> inch doesn???t seem right. ??I???m gu=
essing this
is supposed to be 12 inch-pounds,</div>
=20
<div class=3D"yiv6457723921">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 class=3D"yiv6457723921"><br class=3D"yiv6457723921" clear=3D"none">
</div>
=20
<div class=3D"yiv6457723921">Even if I am correct, I???ve got it set up wit=
h about
a 1/2 lb pre-load right now, and that feels pretty stiff
already.</div>
=20
<div class=3D"yiv6457723921"><br class=3D"yiv6457723921" clear=3D"none">
</div>
=20
<div class=3D"yiv6457723921">Anyone have any experience with this? ??This i=
s a GT6
diff, but I???m guessing the instructions don???t vary much.</div>
=20
<div class=3D"yiv6457723921"><br class=3D"yiv6457723921" clear=3D"none">
</div>
=20
<div class=3D"yiv6457723921">Thanks,</div>
=20
<div class=3D"yiv6457723921">Scott</div>
<br clear=3D"none">
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