Seeking advice in the midst of an M90 coupler replacement.

[Fivefingerdeathpunch]

1. Nope. I just slap it on there and line up the other 3 holes on the snout.

2. Normal. There is no seal. The mating surfaces are what I call matched to each other, they seal pretty much perfect to each other.

3. Just leave the rotor pack in there, no reason to remove it really. Very very small chance you could screw up the needle bearings on the other side when you remove it and install it again.

4. Right, do not touch the rotors with any cleaner. You can clean the gears and the snout with brake cleaner or whatever to get all the old oil off.

You will need anaerobic sealer for the snout, not sure you bought a tube yet. The sealer is designed to seal without air, do not use RTV.

[younger5th]

Thanks for the tips.
I went ahead and got everything back together. I got the anaerobic sealer and hopefully applied it well enough. Even if a tiny bit got squeezed inside from torquing it down, I assume it won't make much difference.
After application, I pushed it in tight. Gave it 10 minutes or so before I torqued it down. Let it sit for over an hour, and then started it for a few minutes. The rock rattle noise is gone and I don't see any leaks so I think I'm in good shape.