is my flywheel OK?

[yankeeboy]

Had a little accident with a loose stator. Stator was grinding on my nice RAD flywheel, of all the damage this is the only one im concerned about. Doesnt appear to be structural, just looks ugly. Is it alright to run?

 

[Waternut]

It's probably fine. How deep is it in comparison to what wasn't touched? Are there any deep gouges or damage to the magnets?

 

[yankeeboy]

I cant tell because there is wear all around the edge. Although there is a little deeper gouge in the middle ( of the outter rim) from the stator screws. magnets seem fine, there arent any cracks or anything, just scratches.

 

[yankeeboy]

 

[D-Roc]

that looks alot like one i threw in the garbage sorry to say. Run it and if you have your front crank bearing or seal fail then you'll know what to do.

 

[Waternut]

Using this picture as a guide, place a straight edge across the blue line and measure the depth at the yellow dots or roughly around those areas and report back. If you have some calipers, that would be the best.

Since you say most of the wear is near the outer diameter, you may be ok. If the worst is near the hub, it's be much worse.

 

[yamahammer]

mine has looked about like that for 2 years. always ran fine. untill i had it apart yesterday and found a nice big crack in the hub right through the keyway. into the trash it went. put on a stocker and it sounds like it revs slower on the trailer. or maybe it was my excessive pouting causing engine resistance. saving for tbm as we speak. anyway if your magnets are good and secure, and the hub is good i would run it.

 

[Idok]

youi could always send it back to RAD for a rebuild...I have a jetinetics that needs to be sent back

 

[keith t]

I had a hairline crack from the woodruff key slot, its just visible in the pic - so I had a bush machined out of stainless and froze the flywheel, then slotted the bush on - that was three years ago - only just removed it - but only to uprade to total loss

 

[skinnyman]

My TBM looks like that and works great

 

[Waternut]

mine has looked about like that for 2 years. always ran fine. untill i had it apart yesterday and found a nice big crack in the hub right through the keyway.

As an aerospace engineer that looks at cracks on planes everyday, I seriously doubt that a crack that started in the keyway was caused by excessive material loss on the face. They don't have anything to do with each other. Now if the flywheel cracks around the outer diameter of the hub, then that could be caused by it but not the inside. A crack in the keyway is much more likely to be caused by a slightly loose flywheel which weakens the sharp angles in the keyway and forms the crack. Don't rule out "rogue flaws" in the material either. Any sharp angle like that is more prone to cracking than a smooth transition and if the material had a tooling mark/microscopic flaw in the metals grain, it could've cracked over time no matter how good/bad the other circumstances were.