Nice to see myself debated.
Both are right about the crank pulley using and not using a Woodruff key. On some it is machined in the pulley and an integral part of it, on others it is pressed in and is therefore techically a Woodruff key - although you can't remove it.
Don't forget the pulley is detachable from the harmonic damper and a lot cheaper.
As far as I'm aware trhe nominal torque at the bolt for all I5s is 332 lb ft, 450 Nm. But the 10/93 Technical Service Bulletin for the ABY and AAN engines specifies 150Nm + 180°.
DO NOT EVER LOKTITE THIS BOLT!
It's hard enough to get off as it is - but the moron who put blue Loktite on an Audi 200 once caused half a dozen of us a day's work. It eventually came off at 820 Nm with three people standing on the engine and a serious ratchet cargo tie wrapped around the left engine mount to stop it shredding.
Audi suggests a thin film of anti-corrosion compound on the mating faces.
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