new converter problems,

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DARTLARRY

DARTLARRY

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I recently purchased and installed a new Coan converter this year. After less than 50 miles the trans started leaking, I am thinking the front seal. I pull the transmission and converter, and notice a groove worn into the shaft of the converter. I sent the transmission out for a rebuild while it was out, but now I don't know what to do at this point. I know I can't put the converter back in. Can it be polished? Do I need to send it back for repair?
 
Never seen a sleeve like that.

Post a pic of how bad the groove is and it
will be able to assess if it is going to eat up
the front pump bushing or OK to run it. Although
if it wiped out the pump seal you are likely screwed.

I always have to take the converter apart to replace
the hub. It is expensive to do! Look at it for cracks as well.
 
I have used them on groved balancers. They do work. I would ask the rebuilder about them.
 
I regularly use them on my Balancers
as well and it works great!

But I am 98 % sure that they are not available
for the converters. I wish they were feasible
as I am sending out a convertor next week to
be replace the hub and I bet it will cost me $300
or more to get it fixed.
 
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The Turbo Action converter I use requires the babbit material front pump bushing. Check with Coan and see if the OEM or babbit is required. I would think a new hub needs to be installed.
 
Without pictures, how the HECK are we even supposed to GUESS? What I would do is contact Coan, send THEM pictures and see what they say.
 
mderoy340 said:
The Turbo Action converter I use requires the babbit material front pump bushing. Check with Coan and see if the OEM or babbit is required. I would think a new hub needs to be installed.
Click to expand...
We run Babbit in all our rebuilds = Even our Street cars and trucks.
 
I was able to polish the groove out to the point where they look and feel like small scratches now. The shaft prior to polishing was 1.87", it now measures at the smallest diameter 1.84". I took about .030" out of it. I hope that doesn't cause a leak when it is all said and done.
 
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My opinion, is that I would not chance the converter hub in a rebuilt transmission. A friend of mine just went through this, had a leak at the front of the transmission so he removed it. The hub of the converter was scored, and the front pump bushing was bad. He sent the converter out to the manufacturer, they cut it apart and found some issues. They repaired the converter and polished the hub. He reinstalled it and it leaked. I measured a hub I have in my garage from a used converter, and his measured less. Took it back apart, sent the converter to another place and they found some more issues. So he bought a converter from the second place, installed it and no leaks.
 
DARTLARRY said:
I was able to polish the groove out to the point where they look and feel like small scratches now. The shaft prior to polishing was 1.87", it now measures at the smallest diameter 1.84". I took about .030" out of it. I hope that doesn't cause a leak when it is all said and done.
Click to expand...
The pump seal is pretty big so I would give it
a try. However, .030 is a pretty large removal IMO.

I wish you had posted a picture.

Of course, for us with lifts and trans jacks it is a lot easier now
than when I had to do it on jackstands and laying on my back!

Replacing the hub will not be cheap.
 

I may send it back anyway just to be safe. I already had the transmission rebuilt, and had the hub was replaced. I am laying on my back still to put it in.
 
DARTLARRY said:
I may send it back anyway just to be safe. I already had the transmission rebuilt, and had the hub was replaced. I am laying on my back still to put it in.
Click to expand...
Smart move. The converter hub needs to be as smooth as a crank journal. Babbitt bushings are typical of what builders use, but I also know some that prefer the bronze bushing. Most if not all transmission, Chrysler, Ford, GM and a lot of others from the factory use babbitt bushings. And it's a wise idea to send it back, and have them replace the hub. The converter shop we had where I worked, replaced ALL hubs on converters, stock, high performance, diesel or industrial when we rebuilt them.
 
DARTLARRY said:
I was able to polish the groove out to the point where they look and feel like small scratches now. The shaft prior to polishing was 1.87", it now measures at the smallest diameter 1.84". I took about .030" out of it. I hope that doesn't cause a leak when it is all said and done.
Click to expand...

I`d bet it will !!
 
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