Quote:
Originally Posted by alexjblake
I will also give it a good visual inspection on that crank pulley but I’m curious how this would cause the juddering after an hour of driving or so?
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A heat from an engine transfers to Crankshaft pulley's rubber making it softer, thus vibration worsens if there is a crack. A visual inspection and a light wobble by hand can give a good picture about pulley condition, normally there is no need to take apart anything to access it, is unlikely to vibrate heavily, but is so easy to check its worth doing it as preventative anyway.
I had an episodes on my N47 where cold start is OK, but after 11 miles once I made my commute to work it started to make an oscillating noise due to crankshaft pulley vibrations.