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Flex Plate Spline Measurement HELP!

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Old Mar 24, 2018 | 01:49 PM
  #1  
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Default Flex Plate Spline Measurement HELP!


1985 928 32v auto
please see the picture it looks like there's too much spline showing based on a write-up I read on a 93 928 GTS.
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Old Mar 24, 2018 | 01:55 PM
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Yes way to much.

Looks like the shaft moved to the back. You'll need to check the back for sure.

The front should look like this.
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Old Mar 24, 2018 | 02:07 PM
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I should have mentioned I am reinstalling a new/used motor after TBF.

Do I just loosen the rear pinch bolt and move it back?

Any suggestions on how to do this?

I have the plug out of the rear pinch bolt location and have loosened it a little, but may need to do more. Also sprayed pb blast liberally in the tt hole.
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Old Mar 24, 2018 | 02:33 PM
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Ok, I see.

You need to move the shaft forward until everything is well aligned.
Make sure the front bolt is lose. Remove the back bolt and aligned everything.

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Old Mar 24, 2018 | 02:36 PM
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I can tell you exactly what is happening here Ryan.

Your rear clamp bolt is installed in the shaft neck-down area, instead of in the shaft cutout where it belongs.

Edit: Betrand beat me to it...

Last edited by Mark R.; Mar 24, 2018 at 03:20 PM.
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Old Mar 24, 2018 | 02:38 PM
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Something looks somewhat out of whack there- has the drive shaft been displaced rearwards by any chance?

The rear pinch bolt is not adjustable as the bolt engages a detente in the shaft. Sounds as though you need to inspect the rear bolt and more to the point fit a new one but before that you need to ensure the detente aligns with the bolt hole and that the assembly has not been chewed up as it were.
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Old Mar 24, 2018 | 02:41 PM
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I encountered the exact same problem. Read this thread:

https://rennlist.com/forums/928-foru...y-looking.html

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Old Mar 24, 2018 | 02:52 PM
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Mark, you just used the right words to what I was trying to show with the pic!
Thanks.

I always try to do my best but my lack of English language skills is often a problem for me here...
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Old Mar 24, 2018 | 11:06 PM
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Originally Posted by Bertrand Daoust
Mark, you just used the right words to what I was trying to show with the pic!
Thanks.

I always try to do my best but my lack of English language skills is often a problem for me here...
I'd say you're doing pretty darn well, Bertrand.

Your English is WAY better than my French...

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Old Mar 24, 2018 | 11:06 PM
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Pretty obvious why the prior engine suffered thrust bearing failure !!!! Clueless " mechanic " .
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