[Fot] Differential Pre-load

[Greg Blake]

Same here but in my case for big TRs. Also recheck the preload after a very brief break-in period. Sometimes things settle in and I have heard of loss of preload. 

If you have never done it, the preload can seem like a very stiff bearing setup. 

Sent from my iPhone

> On Jan 28, 2020, at 4:02 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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