Alan_uk
A2OC Donor
Recently I fixed my weather / heat shield with the help of Matt's (wilco184) excellent thread from earlier in the year: http://www.a2oc.net/forum/showthread.php?30198-Rivnuts . I had some variations in the materials used and fixing.
======= Focus of work =======
The main focus was the shield protecting the fuel filter. As seen in this photo there are 4 fastenings. Note the temporary bracket I had earlier put in place as the shield was hanging down.
1. to the floor bulk head – this was replaced by a rivnut, washer and bolt
2. to the fuel tank bracket - this was replaced by a stud, washer and nut
3. to the angle bracket - this was replaced by a bolt, washer and nut
4. to the sill – the self tapping screw was reused but I've new ones on order
I also changed another fastening similar to item 2 on the front facing side of the fuel tank.
As you can see the fastenings and the shield are badly corroded
Looks like Audi did not use aluminium washers and nuts but either steel or stainless steel. Even stainless steel corrodes next to aluminium. Coatings can delay the corrosion but in places exposed to salty water it will give eventually. See an interesting article here: http://www.stainlessautomotivefastenings.co.uk/index.php?main_page=page&id=11
continues in next post ..............
======= Focus of work =======
The main focus was the shield protecting the fuel filter. As seen in this photo there are 4 fastenings. Note the temporary bracket I had earlier put in place as the shield was hanging down.
1. to the floor bulk head – this was replaced by a rivnut, washer and bolt
2. to the fuel tank bracket - this was replaced by a stud, washer and nut
3. to the angle bracket - this was replaced by a bolt, washer and nut
4. to the sill – the self tapping screw was reused but I've new ones on order
I also changed another fastening similar to item 2 on the front facing side of the fuel tank.
As you can see the fastenings and the shield are badly corroded
Looks like Audi did not use aluminium washers and nuts but either steel or stainless steel. Even stainless steel corrodes next to aluminium. Coatings can delay the corrosion but in places exposed to salty water it will give eventually. See an interesting article here: http://www.stainlessautomotivefastenings.co.uk/index.php?main_page=page&id=11
continues in next post ..............
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