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zaph · 31st December 2019, 19:36

I have been trying to track down a resonance on my 75 diesel and after fitting a new alternator, I used a torch to check the best when it was running.

At relatively regular intervals the belts between the crank pulley and the alternator vibrates up down like a guitar string. That is what is making the noise.

The crank pulley is a new discount rover spares item, as is the drive belt. Has anyone got any idea what could be causing this?

31st December 2019, 19:36	#1
zaph Avid contributor Rover 75 Join Date: May 2015 Location: Leeds Posts: 135 Thanks: 0 Thanked 17 Times in 11 Posts	Noise resonance I have been trying to track down a resonance on my 75 diesel and after fitting a new alternator, I used a torch to check the best when it was running. At relatively regular intervals the belts between the crank pulley and the alternator vibrates up down like a guitar string. That is what is making the noise. The crank pulley is a new discount rover spares item, as is the drive belt. Has anyone got any idea what could be causing this?