What deflection should there be on the Auxiliary Belt on a 1.9Tdi - my mate's just had his changed by a garage but it's making a "shwooshing" noise and i feel there's a bit too much play in it (can almost twist the belt 90 degrees using finger-power...). Cheers, Peeps...

The 1.9TDi engine has a tensioning pulley that should take care of the V-belt tension - you can't adjust the tension manually

it sounds like the tensioner has failed, not unheard of, usually at mileages though

The tensioner should apply the correct tension to the belt . Prior to tensioners being fitted to most cars , a good rule of thumb used to be that the belt tension is correct if you just about turn the belt 90 deg. at mid span along it's longest run using 1 finger & thumb.. So it's appears the belt tension is spot-on . Noise needs investigating

Edited 27 February, 201016 yr by vwcabriolet1971

it sounds like the tensioner has failed, not unheard of, usually at mileages though

Cheers for the replies, foks. The tensioner certainly didn't look like a new item so i suspect that hasn't been changed - i thought they were part of the kit... not always it seems!

Tensioner is not part of the usual kit as it's about £70. Worth replacing though, when they fail it can damage the alternator pulley and or aircon pulley.