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Flexplate noise?

9490 Views 5 Replies 4 Participants Last post by  mr.english098, 
S
Ahh the party under the hood continues. I'm so frustrated I had to walk next door and slap the neighbor for walking out his front door and saying "that don't sound good". Here's what I know.... I dropped the transmission after the most respectable tranny shop in town told me I had a busted flexplate. With this info in brain, I quickly ordered another flexplate and put it in. I inspected the old flexplate, torque converter, bellhousing, input shaft, crank flange, ect.. and saw NO visible signs of damage PERIOD. By the way, this noise just happened one day with no warning or indication. I was sure the flexplate bolts or the starter ring was glancing off of the bellhousing or inspection cover causing noise, but there were no shiny spots to confirm this. Now the new flexplate is in and SAME noise is there. This morning I removed the bolts from the torque converter to the flexplate and started it up. I was hoping to eliminate the possibility of the torque converter being the culprit but instead I get the same noise. I looked before starting the motor, and had at least 3/16 clearance from the flexplate to the unbolted torque converter, so i dont think the two are slapping each other. Could my crank be warped? Rod bearings shot? Any Ideas where this noise is coming from??

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S
anyone?
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85IrocZ-28
Sorry, I am stumped...Hopefully you find someone that knows. I would post on multiple forums if you haven't done so already.

When I am tracing random sounds, I like to use touch to narrow the area where the sound is coming from. I would touch the oil pan, see how strong the vibration is there when that sound is made, compare that with the feel on the transmission pan. Keep hands very far away from belts, pulleys, fans, etc. It almost sounds hollow, like something is rattling around in your exhaust.

Could something have broken of and is being kicked around in the oil pan? The sound is random, not rhythmic.
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S
One of the first things I checked was the exhaust and all connections, hangars, and bolts. The noise is coming from the bell housing area for sure. However there is no damage what so ever to the flexplate, bell housing, torque converter, CPS, or starter. There is some wear on the starter drive gear but I assumed it to be normal wear. Do you think it's possible that the starter gear could droop or be off center enough to barely make contact with the gear ring of the flexplate? I've never heard of this but at this point I'm reaching for solutions. Thanks for your feedback/ opinions though. When I get everything back together again I will try the feel/ vibration check you mentioned. If this problem doesn't present itself soon, my wife will use my face to check the fan RPM's. ;)
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C
my next move would be to make sure the starter is disconecting all the way.

my powerstroke made the same noise when my solinoid stuck. just an idea that the starter is bad.
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mr.english098
Sublimesouth said:
Ahh the party under the hood continues. I'm so frustrated I had to walk next door and slap the neighbor for walking out his front door and saying "that don't sound good". Here's what I know.... I dropped the transmission after the most respectable tranny shop in town told me I had a busted flexplate. With this info in brain, I quickly ordered another flexplate and put it in. I inspected the old flexplate, torque converter, bellhousing, input shaft, crank flange, ect.. and saw NO visible signs of damage PERIOD. By the way, this noise just happened one day with no warning or indication. I was sure the flexplate bolts or the starter ring was glancing off of the bellhousing or inspection cover causing noise, but there were no shiny spots to confirm this. Now the new flexplate is in and SAME noise is there. This morning I removed the bolts from the torque converter to the flexplate and started it up. I was hoping to eliminate the possibility of the torque converter being the culprit but instead I get the same noise. I looked before starting the motor, and had at least 3/16 clearance from the flexplate to the unbolted torque converter, so i dont think the two are slapping each other. Could my crank be warped? Rod bearings shot? Any Ideas where this noise is coming from??
Click to expand...
You ever figure this out?
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