MTFCA Forum

I have a pinion gear with one tooth gouge on it pictured. I wonder how it happened? I don't actually need it because I am changing to a higher ratio of 3:1 but I would rather not just throw it away. It is otherwise good. Other than put it in the box of bad parts what can I do with it?

Keep it as a conversation piece or throw it away. It's not good for anything anymore.

Stephen

Paperweight? Maybe a projectile for a BIG slingshot? Definitely not in a differential any more...

That pinion has shuffled off its mortal coil, and should be permanently retired. If it was a one-off only one in existence pinion, I'd consider using it as a pattern to make a new one... ABSOLUTELY worst case it could be welded, machined, heat treated, hardened, and maybe put back into light duty service, knowing you put a grenade in your rear end and expecting it to come back apart and cause a catastrophic failure of your differential.

ivaldes1 wrote: ↑

Wed Aug 05, 2020 12:26 am

It is otherwise good.

No, it really isn't. Keep it as a conversation piece?

I've decided to wear it to church.

ivaldes1 wrote: ↑

Thu Aug 06, 2020 6:52 pm

I've decided to wear it to church.

An excellent idea!

The highest stress on a gear face is not at the surface but below the surface. After many cycles the gear will fail by spalling. The number of cycles it takes depends on the steel and the force. More force means shorter time. Once a spalling failure occurs on one face the rest are close behind. Better to replace the gear.

Ignacio

Your pinion gear is rather nicer than this one

Could only guess how noisy it ran....or if the owner of that T ever added lube to the axle

WOW Dan!
That has to be one for the record books!
Using that gear as a guide for how long they will run makes Ignacios gear look
good for a lot more miles down the road.

A little JB weld and both those pinion gears are good as new !!
My 13 tooth had a missing tooth that developed last fall....it's in the scrap bucket.
Excessive side shim wear and a loose pinion nut were my assumption of the cause.
New spool FP bearings and reshimmed and all good so far, shifting is much smoother too.

Ignacio, does that pinion gear have Ford script on it? Ford, in the Service Bulletins that it sent out to dealers and repair stations, warned against customer's and mechanic's use of cheaper, inferior, non-Ford parts made of cheaper metals. If it has Ford script on it, Ford wouldn't wanted the public to know that one of HIS parts had failed. He would have wanted that one, BACK.

Just a curiosity question from a wannabe mechanic or maybe closer to a non-mechanic pretending to be one...
If you replace a worn pinion gear is the ring gear normally replaced too?
Would a brand new pinion gear and good but somewhat used ring gear not mesh as well as both new?
I am in the process of rebuilding the rear end on my '24 touring so I guess this is a good time to ask.

Thanks for the learning.

Gene

ivaldes1 wrote: ↑

Thu Aug 06, 2020 6:52 pm

I've decided to wear it to church.

As a hat? A ring? A necklace?

Please elaborate.

It would be immodest for me to divulge.

RustyFords wrote: ↑

Tue Aug 11, 2020 2:05 pm

ivaldes1 wrote: ↑

Thu Aug 06, 2020 6:52 pm

I've decided to wear it to church.

As a hat? A ring? A necklace?

Please elaborate.