Ring and Pinion

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Model T Ford Forum: Forum 2013: Ring and Pinion
Top of pagePrevious messageNext messageBottom of page Link to this message  By Scott Batta on Sunday, October 27, 2013 - 10:27 pm:

I have an unusual wear pattern on my ring. I call it "Buck Teeth". What could cause this? It is ONLY on 10 to 11 keys. It is between the two small screwdrivers.

Main Picture


This is where the Buck Teeth starts.

Ring #1

This is where the Buck Teeth tapers out to normal teeth.

Ring # 2

This is the worst pinion tooth.

Pinion


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike on Sunday, October 27, 2013 - 10:37 pm:

It looks like something isn't running concentric to me. Are the teeth with the least amount of wear 180 degrees away from the middle of the worn teeth?

Too much runout between the gear & the carrier?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Don Lyon, PDX, OR. on Sunday, October 27, 2013 - 10:46 pm:

This could be caused by a bent axle making the ring gear wobble. Just my thoughts, not an expert, Don.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Allan Richard Bennett on Monday, October 28, 2013 - 12:32 am:

Scott, the pinion gear tooth looks rust pitted to me. Otherwise it is an excellent gear and I would not hesitate to use it if had none better.

The crown wheel may be warped or ill fitted to the carrier, so that that section of the gear runs in deeper mesh.

Hope this helps,

Allan from down under.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Adam Doleshal on Monday, October 28, 2013 - 01:33 pm:

Bent or warped ring gear or 2512c left differential gear case half.

Possibly a bent axle shaft, but you should be able to see an unusual wear pattern on the axle shaft at the bearing journals if that is the case...

It's also possible that something prevented drawing the gear down tight to the flange on the differential gear case when it was last assembled. Sometimes the ring gears can be almost a press fit on the differential gear case and you have to be careful to make sure they draw down properly...


Top of pagePrevious messageNext messageBottom of page Link to this message  By Glen Chaffin on Friday, November 01, 2013 - 02:21 pm:

A bent axle housing would have caused the entire ring gear to be worn. The bad wear on one side indicates that the ring gear was not sitting flat on its mount and had a high spot where the ring and pinion gear had no clearance. This is what caused the bad wear on the top of the gear. This was a really bad rear axle assembly and should have made a lot of noise.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Scott Batta on Tuesday, November 05, 2013 - 10:36 pm:

Glen, the ring was snug against the differential all the way around. Other thoughts? Both the Ring and Pinion are being replaced as it goes back together, but I want to prevent it from happening again.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bill in Adelaida Calif on Tuesday, November 05, 2013 - 11:51 pm:

Look carefully at the carrier. It may have a crack around it that opens up under load. My 14 T had a crack around 1/4 of the bolt flange that I almost missed when I was working on it.

Bill


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Wednesday, November 06, 2013 - 07:33 am:

The differential was likely bent in an accident. Or it could have been machined wrong when new, who knows.

You need to find out what caused the problem before ruining another set of gears.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem on Wednesday, November 06, 2013 - 01:22 pm:

Scott,

Before mounting the new gear, be certain that the flange it bolts to is not bent. Not too uncommon.


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