New Noise

[greeno]

Sounds like it's coming from the dizzy. I don't think it's the generator or water pump. This is at idle:

https://youtube.com/shorts/xtPJqD4p7LM?feature=share

Anybody got ideas?

[ODAddict]

How about the clutch area? Try depressing the clutch pedal slightly while running to see if that makes a difference.

[greeno]

Same noise with the clutch in or out

[ODAddict]

There was a lot of competing or background noise in the video. Is it possible to separate out or filter the sound?

Could be a worn camshaft, oil pump issue, valve lifter, distributor, generator or water pump bearing, etc, but go simple first.

What about the belts? Are they in good shape?

[ashyers]

Pull the belt and see if it goes away. Quick and eliminates a bunch of items.

[Rdinatal]

Pull the belt and see if it goes away. Quick and eliminates a bunch of items.

Excellent suggestion!

To me it almost sounds like high pressure air leak. Time for a quick compression test

[Cal_Gary]

Perhaps a manifold leak?
Gary

[Murf]

Go get one of those cheap auto stethoscopes and simply touch each component. When you hit the right one you will know it!

[ODAddict]

Excellent suggestion, Murf.

Now, I'm off to play doctor with my truck.

[greeno]

Same noise with the belt off, and after torquing the manifold (several nuts were loose).