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  •  » Flex Plate not entire flat ?

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    9/20/2020 4:01 AM  #1

    Mach173
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    From: Sweden
    Registered: 8/08/2018
    Posts: 186

    Flex Plate not entire flat ?

    When pulling my 351c I layed the TCI SFI approved flexplate on my bench. I noticed that it was wobbling against the surface, about 1 mm. Im thinking of attaching it to the 351c and rotate the engine and measure with a dial indicator. How much is okay for it to be off ? It could have been distorted when pulling the 351c. I have never had any vibration issues before.

     

    9/20/2020 12:49 PM  #2

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,265

    Re: Flex Plate not entire flat ?

    It is called a flex plate for a reason.  When you tighten the torque converter nuts, the flex plate bends about 1/4” while the center of the torque converter gets pushed hard into the center of the crank.

    So.... ABDFI

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/20/2020 3:16 PM  #3

    Rudi
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    From: Stuck in the 50's Welland Ca
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    Re: Flex Plate not entire flat ?

    ABDFI- - - - ??????????

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    9/20/2020 4:34 PM  #4

    50vert
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    Re: Flex Plate not entire flat ?

    Aint Broke, Don't Fix It

    "Those telephone poles were like a picket fence"
     

    9/20/2020 7:47 PM  #5

    Rudi
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    From: Stuck in the 50's Welland Ca
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    Re: Flex Plate not entire flat ?

    50vert wrote:

    Aint Broke, Don't Fix It

     
    Thanks Barry, makes good sense!

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    9/20/2020 11:57 PM  #6

    Mach173
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    Re: Flex Plate not entire flat ?

    Okay thanks then I will leave it as it is :-)

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    9/21/2020 4:46 AM  #7

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Flex Plate not entire flat ?

    So what I would do is bolt it all together and then check runout.  If there isn't any or its minimal I think you can safely say there's no issue.  If there's substantial runout something is off.  The only reason I mention this is that I'm remembering a post from a member who ended up with a trashed crank due to some issue with the trans/converter.  It was expensive to fix.

     

    9/21/2020 5:13 AM  #8

    Mach173
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    Re: Flex Plate not entire flat ?

    Il probably check anyway with the gauge when its on the stand, rotating the engine.

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    9/21/2020 5:16 PM  #9

    MS
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    From: Canyon Lake, Texas
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    Re: Flex Plate not entire flat ?

    You have to have the torque converter bolted to it and it must be bolted to the crankshaft to check runout. 

    If you did not remove all four bolts at the same time equally, the last one that was tight will have caused it to hold an uneven shape.  Once bolted to the torque converter, it will straighten out.  You cannot JUST bolt it to the converter, as the converter must also be centered by the crankshaft.

    This is not something to worry about unless there are cracks or obvious bends somewhere caused by improper installation.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/21/2020 11:54 PM  #10

    Mach173
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    From: Sweden
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    Re: Flex Plate not entire flat ?

    MS wrote:

    You have to have the torque converter bolted to it and it must be bolted to the crankshaft to check runout.

    If you did not remove all four bolts at the same time equally, the last one that was tight will have caused it to hold an uneven shape. Once bolted to the torque converter, it will straighten out. You cannot JUST bolt it to the converter, as the converter must also be centered by the crankshaft.

    This is not something to worry about unless there are cracks or obvious bends somewhere caused by improper installation.

    Okay I got it , Thanks then everything seems to be ok :-)

    Last edited by Mach173 (9/21/2020 11:55 PM)

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