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Post Info TOPIC: Flex plate wobble


MUSSELMAN'S LAKE, ONT

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Flex plate wobble
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I bought a rebuild 350 and the numbers on it say it came out of a 76 corvette. Which is what the seller said it came out of. I put it on my run/test stand and when I start it the flex plate has a severe wobble. It is a brand new B&M flex plate 168 teeth. If I lay it on my Table saw table (Flattest surface I have) it lays perfectly flat. I can only lay it on one side so it is only proving the ring gear is even. Eyeballing it, the ring gear looks to be even all way around the inner plate. The engine seems to run fine and doesn't vibrate. It is hard mounted to the stand, so I would think it should vibrate like crazy with the amount of wobble I have, about 1/4 inch. The starter engages all the way around the flex plate. Should I be concerned. I don't want to get this in the suburban, hooked to the tranny and everything and then have to remove it. That's why I built the run/test stand. To work out the bugs before it goes in the vehicle. Should I connect the tranny, torque converter, and such, on the stand to see if it wobbles with all that connected. I don't want to mess up the converter or tranny though.

Sorry this was so long. but wanted to give as much info as possible.

I hope someone can help me figure this out.



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ALLAN PARK, ONT

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"Should I connect the tranny, torque converter, and such, on the stand to see if it wobbles with all that connected. I don't want to mess up the converter or tranny though."

Or try another flex plate first. You are saying that the starter engages all the way around, but once it starts, the gear part is wobbling 1/4 inch?

Just me, but I dont like the idea of starting an engine on the stand with just a flex plate. They are quite flimsy when alone, bolting them to the torque converter stabilizes them, I would think.


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DORCHESTER, ONT

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Darn I had the same thing happen with a Pontiac on a test stand.
Bought the plate used but looked new, it also had a slight wobble to it. So gave it to a buddy put it on a lathe using the inside jaws and spun it at low speed.
The inner section about 1 inch from the crank mount had a tweak in it. You couldn't see it , but that small amount of bend magnified the issue.
Guessing who ever removed the engine had the plate on it and it made contact with something hard enough to throw it out.
Its just a possibility ,and something I went through. Good luck with the diagnosis.

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ORANGEVILLE, ONT

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Woud remove the flex plate and use a dial indicator on the crank flange to make sure there is no runout,would then install the flexplate and repeat the procedure,this will give you an indication if anything is not mounted properly or twisted.



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