[Fot] Differential Pre-load

[Jason Sukey]

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 at autox.team.net>
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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