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Just for fun, remove the air filter and leave the cover off to confirm it's from the intake. It it is truly coming from the intake, it should be much louder and the noise should move. I'm at a loss as well. Just be sure the area is really clean before you run the engine.. These things are huge...

I think some pictures are in order to help diagnose. Can you take pics of your intake, with the attached lines? I'm wondering if something is in the wrong place.

Does your air safety valve pop at all or are running over 120 psi on your tanks? If so, it may not be as bad as it seems... Your problem may be the air governor, a relatively cheap part, and would be worth replacing before shoveling out a barrel of cash for a rebuilt compressor. I don't recall...

I'm not sure how that could be possible. The only two lines going to the fan actuator should be the supply line, and then to the clutch fan. Is your exhaust port to the atmosphere or is it piped elsewhere? BTW: Just buy a new actuator. They wear out, and there's not much you can do.

I just ordered a new one myself... VALVE,FAN CLUTCH M939 P/N: CA200046 www.memphisequipment.com $147.50