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I'm not really sure how much pressure is needed to properly seat the seal.
I'm using a deep 10mm socket, and putting some pretty strong pressure on it with my thumb and body, but I'm feeling any kind of reassuring "snap" or "pop" to indicate they have been driven home.


I had the same problem on mine. There doesn't appear to be any indication from the seal that you might expect with a rubber lip seating. I also just used a deep socket with a couple of light taps and that seems to have been good enough. It's been a while since I did this and no problems from a seal slipping up the valve stem.

I think you'll be fine.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles