147 Auxiliary belt / tensioner / idler replacement
After reading a lot about this I tackled mine last night (in a foot of snow...)
Thought it might help others to describe how I did it as there are many posts about difficulty in getting bits out (especially the idler)
First off, the symptoms - a squeek on starting, especially when cold and lasting about 30 seconds before fading out. I was pretty sure it was from the tensioner / belt as a squirt of WD40 around this area cured it for about a week at a time before it came back.
So bought the bits online from Alfaworkshop.co.uk which are genuine parts and gave everhting another soak with WD40 to loosen of any corroded bolts etc. I also ran the car for 20 mins to warm up the engine block and hopefully help the bolts 'ease' their way out!
1. Open bonnet and remove the aux belt gaurd - two allen screws (the back one is longetr then the front one) and a 10mm nut on the water pump housing. You then need to jiggle it backwards through the various pipes and twist it to get it out.
2. Loosen driver-side front wheel jack up the car and support it properly etc etc etc. Remove wheel and the remove the small cover in the lower front corner of the wheel arch (mine only had two screws left but I think it should have at least 3). When you have done this you should be able to see a big pulley in front of you with 4 bolts and to the left of this the aux belt going around the tensioner roller. Above this you will see the plastic idler - make a note of the belt's path round the pulleys (you will need a torch) - it's not too complicated but it saves you scratching your head later.
3. Get a 15mm spanner and put the ring end on the bolt head in the middle of the plastic tensioner pulley. You then need to rotate the spanner as if you are undoing the bolt (it won't actually come off as it is threaded the other way). Now this does take some force! I used a large spanner as an additonal extension with the ring end slipped over the shaft of the 15mm one. You should be able to rotate the tensioner and then slip the aux belt towards you and off the pulley. Take the belt out and keep it (to make sure it is the same length as the one you have just bought! (it should be within about a cm or two allowing for stretching of the old belt).
4. The tensioner can now be removed with a 1/2 inch socket on the bolt just below and to the right of the tensioner part of the component. My new one had a bolt with it but look after yours if it doesn't.
5. The dreaded ider next. This is another 15mm bolt. The problme with this is it is recessed and very close to the wing of the car so a normal socket and ratchet won't fit in. What I did was go to my local motor factors Ken Lees Cars in Romford (thank you) and bought a 15mm swan neck (deep crank is another term used) spanner. You will find that these are the appropriate width to get in to the pulley but the neck is too thick on a normal spanner to get down inside the recess to the bolt. What to do is take the new pulley with you and try the spanner inside the recess - if it doesnot go to the bottom of the recess and allow the spanner head to sit centrally where the bolt would be ask them if they will kindly grind a bit off for you (this is much easier with a bench grinder) - Ken Lee did this for me and it dropped in perfectly. Now to get the idler pulley off go at it from under the vehicle again. you need to remove a plastic dust cap from the pulley with a flat bladed driver and then you will see the bolt - slot on your spanner and again use some more leverage with another spanner / scaffold pole - whatever. At this point mine did not move.... I then gave the spanner a few 'firm' taps with a hammer and it gave a bit - putting the leverage back on then removed it easily. Rotating the bearing indicated it was pretty rough and probbaly well on the way out.
6. Reasemble in reverse - i would advise sticking the new belt on a radiator in the house for a few hours before fitting it to iron out any bad kinks which can be a pain when fitting the belt as it won't go round the rollers / pulleys very easily. Remember to put you covers back on and check that the belt is around all the pulley correctly before starting the car - if it isn't on square it will jump staright of and at the very least probably rip your belt across the vees.
Did mine and no noise when cold starting now!
Hope this helps as I spent many hours reading various posts to find out the best methods. The idler is probably the hardest bit so deffo get the spanner to fit the recess as a priority.