"Chunk" Missing out of CV Axle Transmission Sealing Surface?

Maintenance/Repairs
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2014 Acura TSX, 4 Cylinder, Automatic Transmission
Driver Side CV Axle Transmission Sealing Surface

I went to replace the seal on my car, and noticed a “chunk” missing out of the CV axle transmission sealing surface. It’s at about the 5 o clock position. This is rather concerning to me. It doesn’t look like damage that I did with a seal puller. I would have expected gouges and scratches if it was damage caused by my seal puller. I didn’t have to pull super hard or anything, and I didn’t hear any snapping sound when pulling out the seal.

I take it, it’s not supposed to be like this from the factory? I plan on replacing the seal, but I think this might have been a cause in the leak, there’s less sealing surface?

Thanks for any help!

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Here’s my wild take . . .

That looks too perfect, as if it’ssupposed to be there, perhaps to pop the seal out

I would just go about my business . . . replace that seal, reinstall the cv halfshaft, clean everything up and then monitor it

If there’s no further leak, your job is done

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Thanks. Should I use RTV around the seal, for the mating surface? Some people say to. But it’s not mentioned in the service information. So I figured I wouldn’t. But maybe if it’s still leaking to give it a try.

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I would avoid using rtv around the seal

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Would coating it in ATF to help let it slide in be a bad idea?

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I agree with @db4690 - it looks like it’s machined in and supposed to be there.

I also agree on not using any RTV. In fact, if that little notch serves a purpose the RTV can clog it up. But a little ATF for lube won’t hurt a thing.

Then just monitor for leaks - but that’s SOP anyway.

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If you look at the seal, it’s completely coated in rubber.

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So when you install the seal into the bore, that rubber is going to prevent any fluid from leaking from between the seal and the bore.

A light coating of tranny fluid will make it slightly easier to install the seal into the bore.

Tester

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If I am seeing it right, that notch is for the fluid to drain back when it slashes on the seal to keep it lubricated… or to relieve pressure from behind the seal, would have to see it better…

Anyway, it is normal and do not block it off…