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Iron Filings in Centre Diff
A couple of months ago, I changed all four tyres on my 1984 80q to some
second-hand Continental Sport Contacts. At about the same time, I noticed a
roaring sound (like a wheel bearing noise) that was speed dependant. I
wasn't sure whether this could all be due to the new tyres, so I started
thinking about the transmission (now at 140,000 miles).
Last weekend I thought I would check/change the oil in the transmission.
When I took out the sump plug on the centre diff, I found it had a magnet
in it (confirmed by Bentley) and attached to the magnet was about 1/3 cc of
Is this normal? Should I worry?
I have a leak in the rear diff - it needed 500ml to top this up.
I tried to grease the UJ in the middle of the prop shaft. Unfortunately,
the nipple doesn't point outwards, so it is very difficult to get to - I
have no idea whether I got any grease into it or not. Any suggestions about
how I can check this - is it possible to rotate the square shaft (that the
nipple is mounted on) that attaches to the UJ so that the nipple points
There is a bearing close to the UJ in the centre of the prop shaft. It
looks OK, but if you tug on the propshaft, you can move the bearing around
quite a lot. I would have thought the rubber would have been very stiff -
Sorry for so many questions, but it is difficult to find expertise on these
relatively rare beasts.
I saw one in a magazine for UKP350 which needed a new wing and headlamp - I
nearly bought it for spares, but my wife would never allow me to keep it in
1984 Audi 80 quattro
1983 Audi 100 Avant