Bxzx16v Posted June 10 Share Posted June 10 I've got a noise coming from the alternator pulley and was wondering what the best solution would be regards repair. 1st option is a new pulley at around £63 fitted 2nd is a new alternator at around £260 + labour. The original alternator has done 87k. Removal doesn't look an easy job and even getting the pulley removal tool in to remove the pulley looks too tight tbh. Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted June 10 Share Posted June 10 I'd just replace the pulley in this case. 1 Quote Link to comment Share on other sites More sharing options...
unofix Posted June 10 Share Posted June 10 If you're sure that the noise is from the pulley and not the front alternator bearing, then I'd just change the pulley. Modern alternators are electrically very reliable, no brushes to wear out or voltage regulators to burn out. Occasionally the 3 phase rectifier pack fails but that's about all. 1 Quote Link to comment Share on other sites More sharing options...
agraham Posted June 10 Share Posted June 10 3 hours ago, unofix said: no ... voltage regulators to burn out To be pedantic conventional alternators do have an internal solid state regulator circuit, normally packaged with the rectifier pack, to maintain the output voltage to 14.4V or so by adjusting the alternator field current. More modern alternators still include similar circuitry to determine the output voltage but this is controlled by an external input signal from one of the cars computers to reduce the output voltage, and hence engine load, when the full output is not needed. This is in the name of producing a marginal reduction in emissions. Oh for the simple days! 1 Quote Link to comment Share on other sites More sharing options...
iantt Posted June 10 Share Posted June 10 Oh for the simple days, dynamo and external regulator. Or am I going to far back now. 1 2 Quote Link to comment Share on other sites More sharing options...
Bxzx16v Posted June 10 Author Share Posted June 10 I've been to the see the mechanic this morning and he's diagnosed the bearings failing/failed on the alternator so it's booked in for a replacement.Thanks all for your feedback 👍 1 Quote Link to comment Share on other sites More sharing options...
agraham Posted June 10 Share Posted June 10 1 hour ago, iantt said: Or am I going to far back now Yes, though I do remember such things. A non-electronic 'buzzer' box to regulate the dynamo output by breaking the field current with a pair of contacts that opened when the dynamo voltage was too high. Youngsters will have no idea what I am talking about! 1 Quote Link to comment Share on other sites More sharing options...
mjt Posted June 12 Share Posted June 12 I remember that system too. The relay also incorporated a few turns of heavy gauge wire in series with the dynamo to add a degree of current regulation. 1 Quote Link to comment Share on other sites More sharing options...
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