need a T90 case

[CoastieReid]

I took apart my T90 finally and do not like what I see in the thrust washer area where the main shaft will sit it is grooved pretty deep.

[4x4M38]

I had the same problem. Got lucky and one of our members here had one.

[RonD2]

Hi Coastie,
https://www.youtube.com/watch?v=PZCUhN5_ZrI

Maybe you've already seen this one.
Metalshaper has several good videos about rebuilding the T90.

Good luck!

[4x4M38]

Hi Ron,
The problem she and I had is the grooved area where the flat washer rides inside the case.

The only way I can see repairing that is put the case in a lathe or mill and run a tool holder in the hole in the opposite side, install the cutting tool, and clean up the area. Now of course you have more clearance which you’ll have to figure out how to fill in.

A replacement case is a much simpler solution.

Brian

[RonD2]

Hi Brian,
Yes, understood. Did you watch the video? (shows it).
According to Metalshaper, a replacement case is the only solution.
His video provides several measurements to determine if the case should be scrapped or not.
Apparently there's no way to build up that surface to mill it back to spec, and more thrust washers doesn't seem to be a solution either.

He seems to know what he's doing with the T90. I couldn't find any min-max measurement specs for the case in the manual.
Maybe an expert machine shop could do something, but as far as I can tell T90's don't seem to be in short supply (yet).

Digging into mine is on the list. Fingers crossed.

[4x4M38]

Hi Ron,
Cast iron can be repaired, but it has to be done right.

Good luck with yours!!

[Xamon]

Just me thinking out loud here. I wonder if it could be machined out entirely and given a lip so you could install a flange, either bolted or interference fit. It would let you use a harder bearing surface.

Probably too expensive unless you can do it yourself but eventually someone will either have to make recasts or figure out how to save cases.

[jake138]

Just me thinking out loud here. I wonder if it could be machined out entirely and given a lip so you could install a flange, either bolted or interference fit. It would let you use a harder bearing surface.

Probably too expensive unless you can do it yourself but eventually someone will either have to make recasts or figure out how to save cases.

Xamon,

As with anything else comes with the age old question, is it worth saving? Yes, with unlimited time, effort, and money, there probably is a way to save a worn down case, and in the end creating a better wearing face for the thrust washers than cast iron. But with the cost of a replacement case around $200, will it be worth it? Someone would have to sit down and calculate an actual cost with a plan of how to restore those faces to near-factory spec. Metalshaper's video is relatively precise in how he measures those dimensions, so I can't imagine that it would take much guess work in how to get back to those dimensions, but again it's a matter of how to go about machining the case that is going to cost someone's time and money.

[RonD2]

Yup. And in the meantime, don't scrap any cases!
Let them sit in the corner and collect dust for awhile. Or just about the time somebody figures it out or develops or finds the tooling to do it there won't be any cases left to do it on.

[CoastieReid]

I called Debellas and got a NOS case for $200.

Repop ones cost the same actually at other locations.


I did the critical measurements procedure that Metalshaper does in his video.
Mine is on the worn out side by the numbers.







I did buy a NOS case. Not chancing the old one.

[jake138]

Yup. And in the meantime, don't scrap any cases!
Let them sit in the corner and collect dust for awhile. Or just about the time somebody figures it out or develops or finds the tooling to do it there won't be any cases left to do it on.

You're probably right. No matter how much "quality" might be in a repro, I will still pursue every other avenue I can first. If I get tons of free time on my hands and decided to start trying to refurbish cases, you'll be the first person I let know

I called Debellas and got a NOS case for $200.

Repop ones cost the same actually at other locations.

I did the critical measurements procedure that Metalshaper does in his video.
Mine is on the worn out side by the numbers.

I did buy a NOS case. Not chancing the old one.

Excellent choice. I honestly had only searched one website and saw a repro price of $200, glad you did your research because you definitely made out well there!

~Jake

[4x4M38]

If you could make a new thicker thrust washer to match the amount of material you’d remove to make the surface flat, you’d still have to do something about your shaft hole. It’s pretty gnarly also.

Not impossible.

[1948willyman]

Most likely have a case. Will have to look at it and make sure it is good though.I believe it is.
Let me know, if you have not already found one, and i will check it out.

[1948willyman]

Sorry, Did not read close enough.See that you have already found one.