Cam Belt Replacement.

mike w · Post by **mike w** » Thu May 31, 2007 8:31 pm

Polo 9N 1.4 16V 75bhp.
I 've had new cam belts and tensioners fitted today, and the engine now makes a very noticable whirring noise when revved and also noticable as a steady whine when running at say 30mph.
Previously it was very quiet. Maybe it's the new belts/tensioners causing this and will quieten down after a time or maybe it's the wide flat belt driving the alternator, aircon pump etc. that's been tensioned incorrectly. Just wondering if anyone else has had this problem?

panda · Post by **panda** » Thu May 31, 2007 9:40 pm

take it straight back and have the garage look at it. You don't want it over tensioned or it'll snap.
My mechanic will not tension a belt at all unless its brand new. Just too much risk with tensioning belts. Make sure its done right in the first place.

mike w · Post by **mike w** » Fri Jun 01, 2007 11:39 am

Thanks. Are you suggesting that it is not the cam belt, but the alternator belt that might be the problem? I could have a look myself at the alternator belt tension if I knew where to check and how much play etc.

Jamo · Post by **Jamo** » Tue Jun 05, 2007 12:24 pm

As stated already - take it straight back, which ever of the belt it is.
If it is the fan belt then its a quick fix by the garage - if its the cam belt and they've done it wrong then you could end up in the brown stuff if they don't correct it sharpish.