A/C Gasket

Thanks to all.

never unless there is a leak, lol.
The gasket will dry in the position and form it is in and should maintain the seal. Tightning it will deform it and could cause a leak, although the road will shake and move the AC unit, so there might be some potential for degradadition.

It is protected from UV rays also, so will not crack like the caulking on the roof and wall outer seams which you should check often, be paraniod about, and completely re-do every 2-3 years or else risk catastrophic water damage to the walls and roof.

I have a 2012 5er purchased new. Never tightened the 4 bolts for the roof A/C gasket. If it doesn't leak why tighten it? I used to have many years ago a 1988 Class A where the gasket leaked. It was tightened and the leaks stopped for a bit. It is possible the more you tighten, the gasket looses its ability to do its job. If it is leaking, I would not tighten it more than 1/4 turn at a time.

Thank you. Sounds like good advise.

I think I checked mine once in the last 15 years. Since yours was replaced a few years ago I would probably check it once. Make sure that visually the gasket is only compressed about half way down. Use your fingers and see if the four bolts are tight. If everything seems tight I would put a socket on it and tighten an additional 1/8 to 1/4 turn and no more. Then put it all back together and don't think about it for at least 10 years.