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Re: [Fot] Differential Pre-load

To: fubog1 <fubog1@aol.com>
Subject: Re: [Fot] Differential Pre-load
From: "van.mulders.marcel--- via Fot" <fot@autox.team.net>
Date: Wed, 29 Jan 2020 18:26:15 +0100 (CET)
Cc: fot <fot@autox.team.net>
Delivered-to: mharc@autox.team.net
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Thread-topic: Differential Pre-load
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Glen, 
Thanks , that's a clear and sensible explanation! 
Marcel 


Van: "fubog1" <fubog1@aol.com> 
Aan: "van mulders marcel" <van.mulders.marcel@telenet.be>, "Bill Tobin" 
<william.tobin31@verizon.net> 
Cc: "fot" <fot@autox.team.net> 
Verzonden: Woensdag 29 januari 2020 15:15:11 
Onderwerp: Re: [Fot] Differential Pre-load 




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: 

BQ_BEGIN
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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<html><body><div style=3D"font-family: Verdana, Arial, Helvetica, sans-seri=
f; font-size: 10pt; color: #000000"><div>Glen,</div><div>Thanks , that's a =
clear and sensible explanation!&nbsp;</div><div>Marcel</div><div><br></div>=
<hr id=3D"zwchr" data-marker=3D"__DIVIDER__"><div data-marker=3D"__HEADERS_=
_"><b>Van: </b>"fubog1" &lt;fubog1@aol.com&gt;<br><b>Aan: </b>"van mulders =
marcel" &lt;van.mulders.marcel@telenet.be&gt;, "Bill Tobin" &lt;william.tob=
in31@verizon.net&gt;<br><b>Cc: </b>"fot" &lt;fot@autox.team.net&gt;<br><b>V=
erzonden: </b>Woensdag 29 januari 2020 15:15:11<br><b>Onderwerp: </b>Re: [F=
ot] Differential Pre-load<br></div><div><br></div><div data-marker=3D"__QUO=
TED_TEXT__"><div style=3D"color:black;font:10pt 'arial' , 'helvetica' , san=
s-serif">
<div> <br>
</div>

<div style=3D"font-family:'arial' , 'helvetica';font-size:10pt;color:black"=
><blockquote style=3D"border-left:2px solid blue;padding-left:3px">Does som=
eone 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">&amp; 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 &lt;fot@autox.team.net&gt;<br>
To: Bill Tobin &lt;william.tobin31@verizon.net&gt;<br>
Cc: fot &lt;fot@autox.team.net&gt;<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;fo=
nt-size:10pt;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" &lt;fot@autox.team.net&gt;<br clear=3D"none"><b>Aan:=
 </b>"fot" &lt;fot@autox.team.net&gt;<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">
      <fieldset class=3D"yiv6457723921mimeAttachmentHeader"></fieldset>
      <pre class=3D"yiv6457723921moz-quote-pre">___________________________=
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