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Re: Torque convert wear [Re: qwkmopardan] #2484047
04/17/18 05:26 AM
04/17/18 05:26 AM
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Originally Posted By qwkmopardan
What color is the bushing that conveter rides on, inside right behind the seal. If it is bronze color it will wear the converter hub if it has been replaced. Should have a babbit bushing. Silver color.


Why would a bronze bushing wear the converter ?

Re: Torque convert wear [Re: qwkmopardan] #2484250
04/17/18 03:25 PM
04/17/18 03:25 PM
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Originally Posted By qwkmopardan
What color is the bushing that conveter rides on, inside right behind the seal. If it is bronze color it will wear the converter hub if it has been replaced. Should have a babbit bushing. Silver color.


Ding ding ding
You nailed it

Re: Torque convert wear [Re: GoDartGo] #2484283
04/17/18 04:59 PM
04/17/18 04:59 PM
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So what some of you are saying is bronze bushings wear out converters.

So the millions of Chrysler transmissions using bronze bushings have worn out impeller hubs.

Really?

We replace less than 1% of the impeller hubs in the Mopar Reman program - the rest get roller burnished and fall within print specifications.

No arguement that Babbitt bushings are more forgiving on crank journals and converter impeller hubs - but to make a statement that using a bronze bushing is going to wear out your converter is a gross mis-statement.

Re: Torque convert wear [Re: A727Tflite] #2484942
04/19/18 04:14 AM
04/19/18 04:14 AM
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When the hub is replaced, the new hub is not hardened, and the original hubs were. Aftermarket converters rarely have hardened hubs and usually are sold with a babbit bushing in the box, some people don't think the babbit bushing is necessary and therefore ruin the hub on the torque converter.

Re: Torque convert wear [Re: GoDartGo] #2484966
04/19/18 08:06 AM
04/19/18 08:06 AM
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A crankshaft is not hardened after grinding and bearing material doesn't cause the journals to wear.

Dirt, poor journal finish, poor conn. rod big end geometry, wears the bearings and journals.

A properly built converter with impeller hub runout within specifications that has been properly installed in the vehicle won't wear the impeller either.

Again, if the impeller is worn on one side that's because of excessive runout or a mis-installed converter.

The Babbitt bushing will wear faster in this circumstance because it has less durability - it's softer.

There are only a few suppliers that make impeller hubs, all those that I have seen by the way are hardened Sonnax, Tri-Components, and a few others.

Re: Torque convert wear [Re: GoDartGo] #2484967
04/19/18 08:13 AM
04/19/18 08:13 AM
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If the convertor hub is worn on one side it is likely that the hub / snout is not on centre to the convertor. If the hub is worn all the way around then there is an alignment problem between the crank centreline and the trans centreline and it needs to be addressed.

Re: Torque convert wear [Re: Mcode69] #2485010
04/19/18 11:10 AM
04/19/18 11:10 AM
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Originally Posted By Mcode69
If the convertor hub is worn on one side it is likely that the hub / snout is not on centre to the convertor. If the hub is worn all the way around then there is an alignment problem between the crank centreline and the trans centreline and it needs to be addressed.


Your first statement is incorrect - your second statement is correct.

Think of it this way - a piece in the lathe being cut - if it is crooked, as you come in with your tool what happens ?

You cut only a portion of the part.

If it is perpendicular to the drive head you cut all the way around.

The crank is the drive head, the converter is the part being turned and the bushing is equivalent to the cutter.

Re: Torque convert wear [Re: A727Tflite] #2485133
04/19/18 03:32 PM
04/19/18 03:32 PM
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Rio Linda, CA
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If you place a perfectly round part in a lathe chuck that is perfectly perpendicular but isn't dialed in (IOW, the part is in an elliptical orbit), the tool will only cut part way around as it is fed into the spinning part.

Same with the converter hub, if it isn't centered in the bowl or if the bowl wasn't perfectly centered when welded to the cover, the hub will travel in an elliptical orbit and cause the high part of the hub to wear more than the low part.

Also an out-of-round hub will show more wear on the high side.

Any misalignment of the trans, either lateral or angular, would cause even wear on a perfectly round hub.


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Re: Torque convert wear [Re: John_Kunkel] #2485468
04/20/18 08:38 AM
04/20/18 08:38 AM
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Thanks john, I didn't think it was that hard to work out !

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