Flexplate problems - Dodge Cummins Diesel Forum
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Old 03-17-2016, 05:43 PM Thread Starter
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Flexplate problems

Okay, so my truck recently broke a one month old Pioneer flexplate, it is mostly stock, what could be the cause of this? It had the transmission rebuilt last March along with the converter. The transmission later went back due to a bearing in the overdrive section howling. I talked to a transmission guy who said that it could be a thrust bearing, and the crank would move between the 5 and 10 mark of the dial indicator shown below. So I am at a loss of what to do or think, does anyone have any input on what it could be?




93 D350 LE, 135,000 miles, Rebuilt A518 at 119,000m, Diamond Eye 4in. turbo back
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Old 03-17-2016, 11:54 PM
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5 to 10 oclock position! That's way to much crankshaft end play. You need to drop the oil pan and replace the crankshaft thrust bearing. They have been known to separate.

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Old 03-18-2016, 12:03 AM Thread Starter
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What is the proper spec for the end play? I was told it was 5 to 12 thousandths of an inch, which I thought was in the range shown above.

93 D350 LE, 135,000 miles, Rebuilt A518 at 119,000m, Diamond Eye 4in. turbo back
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Old 03-18-2016, 12:42 AM
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That is 12:30 to 1 0clock. I didn't notice your black marks. I was going by a true clock face.

0.005 to 0.012 is what the FSM says.

If your black marks are the range you had. Your good.

If you know how to check crank center line to engine adapter for being centered. I would suggest that also.

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Old 03-18-2016, 03:10 PM Thread Starter
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Unfortunately, I do not know how to check that, or do not know anyone who knows how to either.

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Old 03-18-2016, 07:56 PM
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This about the best I could explaining how to check engine adapter to trans.

Bellhousing Alignment - Alignment Issues - Circle Track Magazine

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Old 04-04-2016, 11:09 PM Thread Starter
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I figured I would give an update. Well after much more investigation and another rebuild on the converter (Double bearing instead of a single, broken fins, and mounting pads back to specs) went to put everything back together and the flexplate was twisting while tightening up the converter bolts. So out came the transmission again to figure out what was going on. Turns out the hole in the flexplate and crank was out of alignment, which was binding the converter up possibly causing the last broken plate. So, any input on how to remedy this situation? A new flexplate has been ordered to see if that makes a difference.

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Old 04-05-2016, 01:11 AM
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Do you have the old still flex plate {flat } or the new one {1/2 inch sides}
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Old 04-05-2016, 01:33 AM Thread Starter
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The OEM flexplate is still out in the shop, but badly broken, and the new flexplate should be in tomarrow

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Old 05-09-2016, 05:44 PM Thread Starter
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Well, the new flexplate didn't work out as I was hoping and broke about a month in. It was a billet plate and was told it would not break, so now I am at a loss, again.



Broken billet flexplate


You can see it was rubbing the converter here.


The converter pads aren't touching the flexplate like they should but the flexplate is supposed to fit my truck, which is in my signature.
Was told by an experienced transmission guy to put washers on the plate to act as a shim on the so get the pads would touch before the torque converter itself, but the shims didn't allow for enough clearance to get the converter to line up.



This is the gap between the converter and the transmission, should there be less gap? It is as far back as it wants to go.


So does anybody have any idea what exactly is going on. The engine is within spec, the converter was just rebuilt, and the transmission just got looked at again to see if there was something wrong with it. Is there something in the transmission pump that could be causing this. Or is there just something I am missing. I am at wits end and don't know what else to do. any help would be greatly appreciated.

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Old 05-24-2016, 01:03 AM Thread Starter
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Okay, so after another Converter rebuild and getting it machined a little it fit on the flexplate correctly, but now I don't know if I am paranoid or if I am actually hearing the new flexplate going out, again. So if anyone can hear anything out of the norm, please let me know, or tell me if I am just hearing things.

This is from under the truck by the drivers side.
http://vid288.photobucket.com/albums...insGuy/013.mp4

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Old 05-24-2016, 12:10 PM
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I m interested also in whats going on. Good luck to you

1991 Non I/C Goat D250 Cummins Diesel 5 Speed Getrag 3.07 Gears( I can run down Mustang Gt's with those gears) , Bone Stock 25-29.5 MPG
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