[Fot] differential Pinion Height

[J.C. Hassall]

Scott,

This is how I set up my TR4 pinion.  A 1/2" square piece of steel stock
inserted into a socket.  The steel bar thru the square stock was counter
balanced to give zero rotation.  With inch increments lightly notched into
the rod, it was easy to locate the bag of lead shot at precise locations.
When the rod tipped, the pinion torque was dead on.  BTW, the 2x4 was
supporting the diff front, not the drive flange.  It only took a few trials
to tighten the nut to the required torque.

hth

jim

[image: Inline image 1]















[image: Inline image 1]

On Sat, Aug 29, 2015 at 2:54 PM, Scott Janzen <sjanzen at me.com> wrote:

> I'm replacing the bearings in the diff (w/Timken USA) and am puzzled by
> the "set pinion height" instructions.  Here's what the workshop manual says
> (paraphrase):
>  - install the pinion head bearing without the normal 0.10" spacer between
> it and the pinion.
> - install the pinion shaft with bearings, no bearing spacer, shims or oil
> seal, and torque to 12-16 ft-lb
> - put a dial gauge on the housing with the plunger contacting the pinion,
> then putting downward pressure on the gauge, obtain a maximum reading
>  (appears to be one of those special factory tools in the photo though none
> is cited)
> -this reading, subtracted from the normal spacer thickness of 0.10",
> determines the thickness of the "selective spacer required".
>
> Huh?  first of all, the spacer is 0.10" so how can there be a different
> thickness spacer?  The diagram shows no shims at this location.  Second and
> more important, why would the assembly move at all and produce any dial
> indicator readings, given that the pinion bearing assembly is torqued to
> 12-16 lb?
>
> These are not the instructions for shimming the spacer between the
> bearings, I understand those - though I am looking for ideas for a homemade
> preload gauge I could easily make up.
>
> Are the instructions missing something or am I?
>
> thanks!
>
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