Whirring noise at constant RPM only. - Ford Powerstroke Diesel Forum
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Old 02-28-2008, 02:42 PM
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Whirring noise at constant RPM only.

I first noticed a whirring noise that would appear when cruising. It sounds like a cross between rushing air and two dry metallic surfaces continuously rubbing. The sound appears shortly after coming to a constant speed and "spins up". The sound disappears immediately when in gear and I remove my foot from the throttle ... it will also disappear when I put my foot into the throttle but seems to "catch" before it goes away. I initially suspected it was a transmission noise but I also can reproduce it with the clutch disengaged and the engine revved and held at a constant RPM so I believe that should isolate the source to the engine.

This is a 2000 F-250 w/ the 6-speed manual transmission. Any ideas?
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Old 03-04-2008, 08:27 PM
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Noise

Mine was the pilot shaft bearing which was smoked!!
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Old 03-04-2008, 08:45 PM
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Turbo related from what you described.

I'll see if I can find my video...
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Old 03-04-2008, 08:54 PM
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Anything like this?
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