Based on my experience, I see nothing at all in such a kit that would raise any objections in checked baggage. They might open it up and have a look but there's nothing dangerous there. Except the silicone sealant they're all inert parts and nothing is going to leak out. Only flammable adhesives (which silicone is not) are prohibited. Suggest leaving the silicone in the original packaging and inside an additional clear ziplock bag and/or wrap it with a dispensable towel.
Stuff that has been used and has lubricants or fuel residue on it might not be okay.
I'd be a bit worried about those gaskets surviving intact. They're usually supplied shrink-packaged to a thin cardboard carrier and if they get folded they may leak.