TA Leaf Springs

[Rob Reilly]

I have disassembled my rear springs, and I find that, like Herman Munster's ears, they are not a matched pair.

Leaf length measurements in inches, top to bottom.
Left......18-3/4, 26-1/4, 37 loop C/L to end, 34, 30,...........22-1/2, ..15,...........10-7/8, 7-1/4
Right..18-7/8, 27-3/4, 37 loop C/L to end, 33, 30-3/8, 22-5/8, 14-3/4, 11,............7

All leaves are symmetrical with a central alignment button except the 33" on the right is non-symmetrical by an inch. (Maybe it lost an inch somehow?)

The alignment buttons and cavities on the left are 7/16" diameter, where on the right they are 3/8" diameter.
Both have carriage bolts and sleeves in the U-clips, but the left are 5/16" dia. where they are 1/4" dia. on the right.

I also find the leaf ends are not tapered nor is there a radius, they are just whacked off straight, with the result that the sharp ends have worn a mark on the next leaf, not much but still could have been avoided by a radius or taper. I'll put one on them.

The curvature is not the same on all leaves, so unless I hear otherwise I will assume the straighter ones have lost a bit and should be recurved to match the curvier ones.

Thoughts and comments?

[Steve Simmons]

Here is the factory data on the TA springs. Hopefully this helps.

[Rob Reilly]

Wonderful! Thanks so much, this is exactly what I needed.
I'll be working on the front springs next. Is there such a drawing for the fronts?

[Steve Simmons]

This may work. It's labeled TB but I think (not 100% sure) that the TA front spring is the same. Maybe someone can confirm or deny this?

[Rob Reilly]

Thanks Steve.
Someone else sent me the similar drawing for TA from the Blower Manual, and there are some differences. So that answers that question, TA and TB are not quite the same. Perhaps due to different weight engines?
Anyway the arch is given, so I have enough to go on now.

[Steve Simmons]

I realized why I didn't find it the first time. The rear spring was under TA/TB but the TA uses the same front spring as P-Type, which is where the drawing was. Here's a copy.

Looks like the weight load is the same but the rate was changed and some of the leaves thickened. Probably an improvement in durability.