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View Full Version : Noise from alternator/ cam belt area when aircon off


Marc1
06-07-2009, 12:11 PM
Hi

Seem to be having a rather loud gritty / grinding kind of sound coming fromt he engine bay when the aircon is either off or in ECON mode. This happenss on idle and when small revs are applied in gear (i.e. setting off etc). The noise does stil happen at times whent he aircon is on it's full mode, but far less noticeable.

The noise areas to be coming from the front of the engine bay, possible nearer the alternator.

Can anyone offer any suggestions at all? The noise does not sound at all healthy.

Thanks.
arman123
06-07-2009, 12:27 PM
hi mate looks like your pulley on the alternator is gone its called the oneway clutch pulley about 55 pounds from dealers but you need a special tool to fit it
Marc1
06-07-2009, 04:08 PM
Hi, thanks for the info. Is that the top pulley? If so I had this replaced about 8k miles ago, as was squeaking on full lock, at parking speeds etc. This noise is much rougher tho. :(
Crasher
06-07-2009, 04:23 PM
The one on the alternator itself.
Marc1
06-07-2009, 04:54 PM
Cheers Crasher, I'll look into that one then.
benjie
06-07-2009, 05:08 PM
Funny this should come up, I have the same. I have the same sound, if you look down there you can see the tensioner I think and it keeps jumping a bit.
taylorpjuk
29-09-2009, 08:45 PM
Funny this should come up, I have the same. I have the same sound, if you look down there you can see the tensioner I think and it keeps jumping a bit.

This has just started on my wife's 1.4 TDi Polo tonight, awful intermittent noise and tensioner "jumping". It's pouring down tonight!

Did anyone find an answer to the problem?
benjie
29-09-2009, 08:55 PM
This has just started on my wife's 1.4 TDi Polo tonight, awful intermittent noise and tensioner "jumping". It's pouring down tonight!

Did anyone find an answer to the problem?

3 pot power!

Yes, it was the tensioner on the alternator belt. If you watch it when it happens, you'll see it jumping and that makes the noise.
taylorpjuk
29-09-2009, 10:20 PM
3 pot power!

Yes, it was the tensioner on the alternator belt. If you watch it when it happens, you'll see it jumping and that makes the noise.


Thanks for the quick response; I'll look at it in the morning. :D

Now, if only I could find out what the loud clunk in the steering/suspension is! :aargh4:
Crasher
30-09-2009, 01:09 PM
If the tensioner jumps, it is normally the alternator one way clutch that has failed.
benjie
30-09-2009, 07:37 PM
Clunking could be axle bushes.
Crasher
30-09-2009, 08:23 PM
More likely a worn ball joint or twelve.
benjie
30-09-2009, 08:28 PM
Just relating it to a common prob on the MkIV's.