[R-390] R390A Cosmos disassembly question and a second question too!

[Roy Morgan]

On Apr 14, 2010, at 10:25 PM, wa3frp at aol.com wrote:...
> Now, I'm working to open my Cosmos PTO ... I can't figure out of the  
> final metal chamber is just stuck or is a tight fit or is possibly a  
> screw on.

Russ,

Likely it's just stuck.  There is an O-ring that the can slides over  
at the last quarter inch of travel as it's installed. Llikely the O- 
ring is stuck.  I suggest you slip a modestly small thin screwdriver  
under the lip of the can and pry - do this at a number of places and  
the thing may well loosen up and come off.  A tiny bit of wax or  
sillicone grease might be right as you re-assemble.

> ... pressurized with 15 pounds of dry nitrogen. (This was on the  
> warning label).  The nitrogen has long since dissipated but I'd like  
> to know if others have repressurized after assembly or not.

I've never heard of anyone putting pressurized nitrogen in there, or  
even unpressurized nitrogen.  I suggest you ignore the pressure and  
the nitrogen altogether. You may well find some dessicant capsules in  
there. These can be dried out in a 200 degree oven for an  hour or so  
and re-installed if you like.

Roy


Roy Morgan
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