Audi Repair Questions? Ask a Mechanic for Answers ASAP
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That is just a big nut. You cant turn it by hand. They sell a spanner wrench for removing it. If you dont use this wrench or some kind of wrench on it you wont get it back on tight enough and will create a leak there.
I have a huge pair of channel locks that will turn them. If you got any huge channel locks you could try them.
3217 is the part number on the proper tool. Ive also seen people use a screwdriver and a hammer tapping on one of the ridges too though I cant recommend it on a professional level.
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