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Old 02-08-2012, 02:14 PM
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Fly Wheel Problem

Ok so how many of you with an Automatic behind a 7.3L Powerstroke have had problems with your fly wheel.

I am asking because my friend's broke into two pieces, the center where the bolts go to the fly wheel seperated from the rest of it. He has about 150,000 miles on his truck.


Now my truck is making the same noise and I am preparing to remove the transmission to see what is going on. I already bought a new fly wheel. I have 239,000 on mine.

My buddy was told that when the fly wheels were made for the 99-2002 trucks. They were over heated and that actually ruined the heat tempering of the steel. So the metal is weakened.

I am trying to find out how many have had problems with this.
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Old 02-08-2012, 05:19 PM
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Whats the sound like?
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Old 02-09-2012, 02:53 PM
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Quote:
Originally Posted by Zaairman View Post
Whats the sound like?
Metal on metal grinding noise, it goes away around 1,000 rpms and comes back when the engine comes back to idle.

My buddy's fly wheel was in two pieces when he took it apart.
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Old 02-09-2012, 03:07 PM
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I think you mean the flexplate, not a flywheel right? An automatic trans uses a rather thin flexplate, unlike a heavier, thicker flywheel in a manual truck.

I've ran into cracked flexplates rather often. It's not a super common failure but it does happen. It will normally make a horrible rattling sound until you get over 1000 rpm, and will usually only make the noise when not under load. You can also have the same sound if you have an issue with your torque convertor.

The flexplate will crack right outside of where it bolts to the crankshaft. I'm not sure what exactly causes this.

I would say replace the flexplate and let it eat. You'll be fine.

If you have a manual trans and are hearing this noise then it's probably caused by a faulty dual mass flywheel, but if I remember right I thought they were only used in the OBS trucks.
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Old 02-09-2012, 03:12 PM
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Never mind, I just looked at your profile and see you have an automatic. You have either a goofed up flexplate, or a torque convertor issue. More then likely you have a flexplate problem.

BTW, you have a 4r100 trans, not a e40d. Not a huge difference from a e40d besides a couple other speed sensors.
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Old 02-09-2012, 08:20 PM
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My truck makes the rattling sound at idle in park. I've just always assumed it was the torque converter.
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Old 02-10-2012, 06:20 PM
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flexplate is what it is. I have always called them flywheels, because in the Marines when you look you up a flexplate for a hummer it is listed as a flywheel in the parts manual.

It was cracked all the way around where it bolts to the crank. My buddy's did the samething this week too.
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