Quote:
Originally Posted by Allworth
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.
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It's an interesting theory, I haven't heard anyone else attribute it to this problem. I'm not sure though as most who've solved the problem involved full box replacement. Definitely worthwhile checking as you say.