Dent in rotor
 

Hello. Just bought a set of rotors from ebay, arrived today, one rotor got a dent at corner seal/apex. Is it possible to do something with this? Look at picture.

Thanks
https://cimg3.ibsrv.net/gimg/www.rx7...e1efc062e3.jpg
https://cimg9.ibsrv.net/gimg/www.rx7...6ba830d1d6.jpg

Not really... paper weight/display item.

Okay. Thank you!

😞

Since it's a paperweight now, you can try to fix it without worry. See if you can lightly hammer the bent section back up and make sure all seals move without binding. Maybe some sanding and filing is necessary. Or not. It makes a nice paperweight. Or a clock.

Depending on the measurements of the damage, can't it be machined for 3mm seals and be good to go?

I think the more critical of the two issues with that damage is the corner seal slot, and this does nothing to address that.

Now, that said ... since we're venturing on the topic of possible fixes, Maybe try to straighten it out as best you can (I don't know if using heat would help or hurt with that), then you can use machine tools to get the corner seal slot round again, then file the apex slot and shoulder to spec. At least that's my 2 cents. I have an older 12A rotor with similar damage, and that's what I hope to try with it.

Thanks for the replayes. It' s already machined to 3mm apex. So it's not possble that way.
​​​​​​Getting an answer tomorrow if I'm going to return them qnd get my money back, not returing them and money back, or no money and no return.
If I keep them, I will try to straighen it.we have a lot of milling machines and other metalworking machine at work.

Best regards

ok, well.... if we are going that route. Yes, these could be potentially fixed. but at a bare minimum you would need access to a full size manual mill (Bridgeport) or similar and be skilled enough to use it properly. In this case, a queston would not have been posted, because the owner of the rotor would already know what is and is not possible to fix and use.

So, to get into a "usable" but not ideal situation. You would first need to mill the apex slot back to factory spec. In this condition, I do NOT recomend filing. The slot will not remain true unless you have a very skilled hand with a file. Filing and ol undamaged rotor back to spec is one thing. Removing this amount of material is another situation.

Next would be to machine the face of the rotor. By face, i mean the area where the corner seal is installed.

Lastly, you would need an accurate boring bar to get the corner seal location back to it's round shape and within it's correct diameter.

Even doing all this, you would still have a corner thats missing. It was pushed over and then you would have machined it off. I do not think its possible to hammer it over without causing more damage.

With the low cost of rotors, unless its rare 12a Turbo rotor. It's much easier, and most likely cheaper (unless you perform the work yourself) to get a replacement.

Hello. Thanks for replys. 🙂

It's already millied to 3mm. But at my work we have one department that is special for metalwork. Asked him and he will try to fix it. Got my money back from ebay today. So it's no risk of trying.

Will post a picture of the fix.

https://cimg3.ibsrv.net/gimg/www.rx7...cd7a1e77b8.jpg

https://cimg8.ibsrv.net/gimg/www.rx7...3cec4e7a79.jpg



so, what doy you guys think? Will it work? Corner seal is moving freely, the apex seal also.

Regards Joakim

It looks a lot better but we can't tell you if it's usable or not. You will need to measure the clearances with the seals in place to verify that part.

Correct. Visualy, sure... looks fine. But it must be in specs with seals installed.

I would say your guy at work did a fantastic job.
I would run that rotor, just out of respect for that guys efforts.

+2

If within spec, is the material there weaker now that it's been bent back and forth? Will combustion pressure push it back and pinch the seal?

You paid for that in that condition? Is it shipping damage or were you aware of the damage before buying it? Have you notified the seller? Raw deal if you ask me. I wouldn't use it. You could be saving or you could be wasting -it's a coin toss really.

It was damaged in shipping. Got my money back from ebay.

Sweet.

Amateur shippers (I was one of them many moons ago) I believed you could of fixed it with the right tooling, A machined stepped corner seal hardened type of tool would knock the corner back in place and a similar sanding tool would finish it off, some precise filing and more sanding for the apex seal groove. Thing is that most people want to fix it with common hand tools, that wont work

Great job, but why risk it on a new build?