Hi, These are for a 7 series v8 but the method is the same as are the tools required, after the diagrams you will see titles undrlined 'click' on these they are a step by step, so it should be the same process, BMW E38 Water Pump Removal and Replacement
p.s the 32mm spanner is to get the viscous fan off, which you should be able to get from a good car shop. all you do is put on and give it a good whack with a hammer, maybe a few times, REMEMBER it is a lefthand thread opposite to normal!!!! so undoes the other way to a normal nut, takes a couple of secs to work out when you have the spanner on it ! Ha Ha!
any probs get back to me.
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