Diff centre

[dave in australia]

This explains why I had a tight spot after assembling the diff in my roadster. It was the only thig I didn't measure before assembly. Now to go through my collection of spares to get one that runs true. I don't know how something could get this far out of true. There are assembly marks from someone in the past, so they may have tried to true it up in a lathe or something and really butchered the job.

 

[Joe K]

I have seen issues with the "cone bearings" on either side. The race (moving part) was fine but the "runner" (bearing ring) was machined out of center.

I wondered when I saw it how such a thing could get past Quality Control.


Joe K

 

[katy]

[QUOTE"cone bearings"][/QUOTE]

AKA: tapered roller bearings

 

[Joe K]

[QUOTE"cone bearings"]

AKA: tapered roller bearings[/QUOTE]

Thank you. Cone bearings harkens back to an age before the Model A. Possibly before the Model T.

It seems improbable that someone would actually set up and machine the carrier - and then leave it wrong? If you go to the effort to disassemble, you usually go to the effort to figure out what is wrong and correct it.

I suppose anything is possible. Perception is about 80 percent of problem solving. We're obviously talking here about the 20 percent.


Joe K

 

[gdmn852]

Hello, is that .030 run out ? As mentioned don’t see how that could have gone through OC unless inspector was out that day !Maybe check thickness of the flange area to see if it is relatively uniform, or bearing misalignment.

 

[gdmn852]

Another thing you might try is put the other bearing into the race and reindicate the back side of flange if you get about same amount of run out, could be bearing isn’t seated . Good luck,

 

[dave in australia]

Another thing you might try is put the other bearing into the race and reindicate the back side of flange if you get about same amount of run out, could be bearing isn’t seated . Good luck,

Yes, did that, and had a similar result. Disassembled the halves and tried each half in the house. They ran true. I ran a mic over each half on the face where the two halves join and where the crown wheel sits. The faces were parallel within .001". Then found the culprit, a piece of swarf was stuck on the face where he two halves meet. Remove that and now ready for reassembly and another bunch of measurements.

 

[Joe K]

Remove that and now ready for reassembly and another bunch of measurements.

So you're at the store and they ask you if you like driving an antique car. You reply in the affirmative.

"I bet you REALLY know that car inside and out."

You shake your head affirmatively and no smile. "Yeah, I know it."

You're now qualified to say that.

Joe K

 

[dave in australia]

So you're at the store and they ask you if you like driving an antique car. You reply in the affirmative.

"I bet you REALLY know that car inside and out."

You shake your head affirmatively and no smile. "Yeah, I know it."

You're now qualified to say that.

Joe K

I've been doing Model A stuff for over 40 years, I still wonder some times.