After I rebuilt the engine on my 1968 2000 TC, I have a whine at mid RPMs that I do not recall from before the project. It persists regardless of the gearbox or clutch "position". It happens sitting still and when in motion. I removed the fan belt for a short run to eliminate the possibility of it being the water pump, fan or alternator. Nothing changed. I checked the top chain tensioner and it looks fine. I have attached a zipped .wav audio file of the noise. You can hear that the noise starts as the engine speed goes above idle and then fades as the engine speed increases further. It returns as the engine speed drops through the same speed band. If anyone has any ideas, I would be grateful.
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