[Fot] Differential Pre-load

[Brian Schirano]

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 at 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 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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