roof air install

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marunr1

New member
Joined
Feb 9, 2006
Posts
4
Hi,
I'm replacing the gasket on my coleman roof air unit and I'm wondering how tight to tighten the bolts? I seem to remember reading somewhere they should be torqued to 40 to 50 lbs. Is this correct?

Thanks!
 

Karl

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Joined
Mar 3, 2005
Posts
5,154
Location
Elkhart Lake, WI for the summer. Work at Road Amer
Sorry, Not correct!

The installation instructions state that you should tighten the mounting bolts evenly, using a technique like tightening lug bolts on a tire, until the gasket is compressed by about 50%. 40-50 ft/lbs. would be excessive. I'm guessing it's going to be something less than 10 ft/lbs; probably a lot less. :)
 

Gary RV_Wizard

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Feb 2, 2005
Posts
74,604
Location
At our Silver Springs FL home
That sounds a bit high - they should be nicely snug but not overly tightened.  The idea is to compress the gasket a little but not to squeeze it flat or cause it to squish out the sides.  If the a/c manufacturer doesn't provide a torque spec, "snug" is about as definitive as it gets.

Check the tightness again after the first trip and again in another month. The bolts sometimes loosen up a bit.
 

Ned

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Joined
Feb 1, 2005
Posts
25,107
Location
USA
We just had the gaskets replaced on our A/C units and the tech said the correct torque is 6 lb-ft.  Lacking a torque wrench, tighten them so there is about a 1/4" bulge in the gaset on the inside.
 

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