When I had the trans off the last time I visually inspected the flex plate for cracks and obvious signs of issues, but didn't see any -- although I did not remove the flex plate from the crankshaft. It's a two piece type design. It's a thin metal triangular piece that is held to the geared part via the crank shaft bolts. (like this. Not the actual unit)
I was wonder if some of you are familiar with this sound and issue. The first part of the video is in normal speed, and the second part is in slow motion. In slomo, you can see a relationship between the flex plate flexing and the sound.
Had one on a Chevy truck with a similar sound. There was a loose bolt, and every time it spun around it smacked the dust shield. Look for something with a shiny rub mark before you decide the plate is flexing.
In reply to tr8todd :
Thanks. I looked for evidence, but didn't find any. But, it's obvious that I missed something LOL. I think I am going grab another flex plate and swap this one out to see if it solves things
In reply to Ranger50 :
Now I am wishing I would have went ahead and removed it when the trans was off, but I am getting good at removing an E39 trans LOL
Here's mine. It was remarkably quiet until it wasn't, at which point it made a noise like all of my dead Harbor Freight hammers had returned from the underworld to haunt the inside of the bellhousing.
In reply to SkinnyG :
Oh! Being somewhat new to these automatic transmission issues, I realize I really should have removed the flexplate rather than trying to eyeball it on the car. Now for another trans removal. This time I think I will time it. I bet I can remove the trans in less than an hour now. (the silver lining)
In reply to ¯\_(ツ)_/¯ :
WOW! That is impressive...Was it still in place when removed? Could the car still be started?
Something is either loose, broken or bent. There shouldn't be anywhere near as much runout as you have.
In reply to APEowner :
That's what thought. I check runout whilte turning by hand. It was a few weeks ago, so I don't remember the measurement. But, it was small. With the engine running the runout is obvious. Nothing is bent, so I am guessing there is a crack hidden behind the triangular piece
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