Re: [Fot] Differential Pre-load

[Brian Schirano via Fot <fot@autox.team.net>]

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If you have a digital torque wrench check it, there may be an option. Not
long ago I found inch pounds option on the one I borrowed

On Tue, Jan 28, 2020, 5:01 PM Jason Sukey via Fot <fot@autox.team.net>
wrote:

> Hi Scott,
>          Instead of the bar and weight method, I have a 0-30 in*lbs dial
> type torque wrench I use.  For the spitfire/GT6 diffs, I use the book
> preload spec you are using (no seal/new bearings).  The only "trick" I've
> noticed, the static friction (break free) torque is always a bit higher, =
I
> measure the actual torque to rotate once moving.
>
> Jason
>
> On Tue, Jan 28, 2020 at 4:35 PM Scott Janzen via Fot <fot@autox.team.net>
> wrote:
>
>> I=E2=80=99m rebuilding my differential.  The manual says the pinion bear=
ings
>> 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=E2=80=99m not grasping the concept, or 12 lbs *per* inch doesn=
=E2=80=99t seem
>> right.  I=E2=80=99m guessing this is supposed to be 12 inch-pounds,
>> which I think means a one pound weight at the end of a 12=E2=80=9D lever=
.  All
>> testing is performed with the seal removed.
>>
>> Even if I am correct, I=E2=80=99ve 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=E2=80=
=99m
>> guessing the instructions don=E2=80=99t vary much.
>>
>> Thanks,
>> Scott
>> _______________________________________________
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>>
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>> _______________________________________________
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>
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>
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<div dir=3D"auto">If you have a digital torque wrench check it, there may b=
e an option. Not long ago I found inch pounds option on the one I borrowed<=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Tue, Jan 28, 2020, 5:01 PM Jason Sukey via Fot &lt;<a href=3D"mailto:fot@=
autox.team.net">fot@autox.team.net</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><div dir=3D"ltr">Hi Scott,<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Instead of the bar and weight method, I have a 0-30 in*lbs dial type =
torque wrench I use.=C2=A0 For the spitfire/GT6 diffs, I use the book prelo=
ad spec you are using (no seal/new bearings).=C2=A0 The only &quot;trick&qu=
ot; I&#39;ve noticed, the static friction (break free) torque is always a b=
it higher, I measure the actual torque to rotate once moving.</div><div><br=
></div><div>Jason</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Tue, Jan 28, 2020 at 4:35 PM Scott Janzen via Fot=
 &lt;<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank" rel=3D"norefer=
rer">fot@autox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex"><div>I=E2=80=99m rebuilding my differential.=C2=A0 T=
he manual says the pinion bearings should be assembled with spacers to yiel=
d a=C2=A0<div><u>12-16 lb/inch pre-load,</u> using a bar affixed to the inp=
ut flange and a sliding weight.=C2=A0 Of course there is a churchhill tool =
for that!</div><div><br></div><div>Either I=E2=80=99m not grasping the conc=
ept, or 12 lbs <u>per</u> inch doesn=E2=80=99t seem right.=C2=A0 I=E2=80=99=
m guessing this is supposed to be 12 inch-pounds,</div><div>which I think m=
eans a one pound weight at the end of a 12=E2=80=9D lever.=C2=A0 All testin=
g is performed with the seal removed.</div><div><br></div><div>Even if I am=
 correct, I=E2=80=99ve got it set up with about a 1/2 lb pre-load right now=
, and that feels pretty stiff already.</div><div><br></div><div>Anyone have=
 any experience with this?=C2=A0 This is a GT6 diff, but I=E2=80=99m guessi=
ng the instructions don=E2=80=99t vary much.</div><div><br></div><div>Thank=
s,</div><div>Scott</div></div>_____________________________________________=
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