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Looking at the bearings I am replacing, there is evidence of slight =
uneven loading in the wear pattern. A pinion shaft is in a constant =
position of being forced to try to move out of alignment, over a very =
short axis. Think of it as attempting to climb out of the ring gear on =
every rotation. I=E2=80=99m sure the preload is to try to keep it in =
place with more equal wear on the bearings.
On Jan 29, 2020, at 8:13 AM, van.mulders.marcel--- via Fot =
<fot@autox.team.net> wrote:
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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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Looking at the bearings I am replacing, there is evidence of =
slight uneven loading in the wear pattern. A pinion shaft is in a =
constant position of being forced to try to move out of alignment, over =
a very short axis. Think of it as attempting to climb out of the =
ring gear on every rotation. I=E2=80=99m sure the preload is to =
try to keep it in place with more equal wear on the bearings.<br =
class=3D""><div><br class=3D""><div class=3D"">On Jan 29, 2020, at 8:13 =
AM, van.mulders.marcel--- via Fot <<a =
href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D""><div style=3D"font-family: Verdana, Arial, Helvetica, =
sans-serif; font-size: 10pt;" class=3D""><div class=3D"">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.</div><div =
class=3D"">Marcel.</div><div class=3D""><br class=3D""></div><hr =
id=3D"zwchr" data-marker=3D"__DIVIDER__" class=3D""><div =
data-marker=3D"__HEADERS__" class=3D""><b class=3D"">Van: </b>"fot" =
<<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>><br class=3D""><b class=3D"">Aan: =
</b>"fot" <<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>><br class=3D""><b =
class=3D"">Verzonden: </b>Woensdag 29 januari 2020 04:06:57<br =
class=3D""><b class=3D"">Onderwerp: </b>Re: [Fot] Differential =
Pre-load<br class=3D""></div><div class=3D""><br class=3D""></div><div =
data-marker=3D"__QUOTED_TEXT__" class=3D""><p class=3D"">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.</p><p class=3D"">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!)</p><p class=3D"">Also a =
"clicker" torque wrench isn't the ticket for this. Use an
older beam type.<br class=3D"">
</p><p class=3D"">Hope this helps.</p><p class=3D"">Cheers Bill<br =
class=3D"">
</p>
<div class=3D"moz-cite-prefix">On 1/28/2020 4:34 PM, Scott Janzen =
via
Fot wrote:<br class=3D"">
</div>
<blockquote class=3D"">
=20
I???m rebuilding my differential. ??The manual says the pinion
bearings should be assembled with spacers to yield a??
<div class=3D""><u class=3D"">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>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Either I???m not grasping the concept, or 12 lbs =
<u class=3D"">per</u> inch doesn???t seem right. ??I???m guessing this
is supposed to be 12 inch-pounds,</div>
<div class=3D"">which I think means a one pound weight at the end =
of
a 12??? lever. ??All testing is performed with the seal =
removed.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">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>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Anyone have any experience with this? ??This is a =
GT6
diff, but I???m guessing the instructions don???t vary =
much.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Thanks,</div>
<div class=3D"">Scott</div>
<br class=3D"">
<fieldset class=3D"mimeAttachmentHeader"></fieldset>
<pre =
class=3D"moz-quote-pre">_______________________________________________
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on.net</a>
</pre>
</blockquote>
=20
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