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Flex Plate Spline Measurement 3.1mm within spec?

Old 11-16-2017, 07:59 PM
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Default Flex Plate Spline Measurement 3.1mm within spec?

Car 928 S4:
A/T Flex Plate Spline Measurement is 3.1 MM - Is this within the spec?
Flex Plate is nearly straight.
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Old 11-16-2017, 09:02 PM
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based on your question you should read this thread by Bill Ball it gives good info about the flex plate check,
also click the search button and type in flex plate check.
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Old 11-16-2017, 10:05 PM
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The spline measurement is only an indication of how much pressure there is on the flex plate and ultimately on the crank bearing.

3.1 mm is not much and quite normal. So the flex plate should be straight or very close.

You need to check the crank endplay to make sure everything's fine.

Follow Mrmerlin's thread recommendation.

A very good one on the subject.

This is what the splines look like on my car (no pressure).
The white paint is an easy way to see if anything has moved.
The after market part in front of the stock clamp is a PKlamp. It helps to prevent any mouvement. Very happy with it so fare. Not very expensive and easy to install.

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Old 11-17-2017, 12:41 AM
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Thank you so much!!
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Old 11-17-2017, 10:49 AM
Jerry Feather
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Where exactly and how are you measuring 3.1mm? What is that a measurement of? If your flex plate is actually straight there is likely no movement on the splines.
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Old 11-17-2017, 12:22 PM
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Fuggeddabbout the spline measurement at the flex plate. The ONLY method to determine damage to the thrust bearing is the crank end play(or end float) check. It is done with a dial indicator, and described very well on other threads. Search is your friend: TBF, thrust play check, crankshaft float, dial indicator, etc.
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