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Larry,
I started to answer this yesterday evening, but wanted to see other responses first. Mine accumulates dirt and grit quickly as Ted stated his does. I generally blow mine with air or vacuum.
Let me know if you figure out why this happens.
Hector
You guys that are getting dirty are the radiators in the same enclosure as the gen itself. If so that would be a big reason. I know there is a course filter for the intake on this design but try improving it. On this design where both components are in the same "box" you are also exhausting noise from the gen along with the hot air from the radiator, no good Mr bus driver.
IMO the better design is to separate the 2 for both reasons it stays clean and it is quieter.
Larry,
On the Liberty the gen and fan assembly are in separate compartments, but those compartments have air openings between them, usually with some type of screen. I think you will find that all that dust and junk probably came through the openings while running your gen in Arizona.
Maybe Paul can jump in here, his vintage is the same as yours..
On our Liberty, the "box" that contains the generator stays very clean.... no accumulation of sand or such.
However, I don't remember ever running the generator while driving, although it has been running in some fairly dirty areas while stationary for as much as 18 - 20 hours at a time to keep the AC's running while dry camping. Still, no real issue with dirt or sand.
Wish I had an answer for you....
Larry,
I think Truk is probably right on. I notice the dirty ones all appear to be operating or from the Desert Southwest. CC does install that pad/fibermat/foam or whatever on the inlet screen and yeah it can get dirty fast. Mine does not get too dirty but on the other hand I rarely use the generator so that may explain that!
Get out your first aid kit, stock up on band-aids, and attack the fiber matt with a good bath...then watch it. I'll bet your issue disappears now that you are out of the desert.
John