NAA Axle Pivot Pin.

Two0aks · Apr 21, 2018

Advice or opinions. Removed the Front support & Center axle together to press out the pivot pin. Front support all cleaned and pivot pin too. My pivot pin OD 1.7455 top to btm. and 1.7465 side to side. YT store non threaded pin 1.743 Smaller than mine ? My center axle bushing ID, Fwd 1.764 side to side & 1.780 top to Btm. Aft 1.785 top to Btm. YT store 1.778

It all looks pretty good and I would replace except the new ones dimensions don't seem correct. Their new nonthreaded pin is smaller than my old one, and their bushing is only .007" smaller than my largest dimension.

With the tires still on and radius rods out of their brackets ther e wasn't a terrible amount of movement up and down. What say you all ?

Tall T · Apr 21, 2018

[Hmmm,

You have this curious habit of starting the same subject all over again in a new thread, whenever the progress of the same repair changes a little — like the battery box.

Just curious

TheOldHokie · Apr 22, 2018

(quoted from post at 21:18:46 04/21/18) Advice or opinions. Removed the Front support & Center axle together to press out the pivot pin. Front support all cleaned and pivot pin too. My pivot pin OD 1.7455 top to btm. and 1.7465 side to side. YT store non threaded pin 1.743 Smaller than mine ? My center axle bushing ID, Fwd 1.764 side to side & 1.780 top to Btm. Aft 1.785 top to Btm. YT store 1.778

It all looks pretty good and I would replace except the new ones dimensions don't seem correct. Their new nonthreaded pin is smaller than my old one, and their bushing is only .007" smaller than my largest dimension.

With the tires still on and radius rods out of their brackets ther e wasn't a terrible amount of movement up and down. What say you all ?

I know almost nothing about the NAA but have a lot of time making those parts for the N-series. The clearance between the pin and axle bushing is not critical. Start to worry when the number right of the decimal is greater than zero.

What is of more concern is the clearance between the pin and the bore in the axle support. That should be .000/.003 and I try to keep the pins I make on the low end of that range. On an N-series that means a pin OD at the support points of 1.749/1.748 - which is the specification on the original Ford print for the N-series pins. If I overshoot by more than a thousandth it goes in the scrap bin.

TOH

Two0aks · Apr 22, 2018

Thanks TOH for the advice. After cleaning with fine emery the pin just barely fits the Supt. Brkt. It was interesting but not surprising to see the pin is hardened and that the bushing was not as bad as seen in many of the archived posts. Certainly not worn through as some others. I replace the pin and bushing in my Fergy TO30 years ago and the bushing was bronze.

NAA Axle Pivot Pin.

Two0aks

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Tall T

Well-known Member

TheOldHokie

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Two0aks

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