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150k miles on it, so I'm thinking an auxiliary belt (chain cam engine). The noise goes up & down as you rev the engine (sounds like an old fan-driven electric heater !), even when it's in neutral, so presumably engine, not transmission, related. Any ideas anyone ?!
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Alternator bearings?
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a thought - are they expensive ? Do you need to replace the whole alternator ?
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You'll probably have to buy a new alternator, if it is the problem. Best thing to do is open the bonnet and find out exactly where the noise is coming from.
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a thought - are they expensive ?
Almost certainly - well it is a Toyota!
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Agreed, may well be the alternator. I had a similar noise with a corrolla and left it to get worse for a few years. When I did get the alternator replaced it did fix the noise and improved the fuel consumption a bit too.
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You really only need the bearings replaced if the rest of the alternator is working OK. This place will likely be able to help (either with parts, or a new alternator if needed):
www.exchange-starters-and-alternators.co.uk/nippon...m
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Or you could remove alternator belt and restart and see if noise has gone away!
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Cheers guys - the odd thing is the noise keeps coming & going - but there is a lower-level high pitch 'whine', and also a quiet 'thump' when you turn the engine off ?
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Don't mean to be patronising but a simpler solution may be the tightness of the fanbelt (drivebelt). My friend had this problem on a Fiesta. I suppose the bearings on the alternator will be destroyed anyway if you have driven it enough with it too tight.
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