I did the water pump on my '78. it was much easier than described for the 220. it only took about an hour and I work slow.
take off the fan blades, loosen the belt, get in there with a 10mm open end wrench and get the rest of the stuff out of the way. careful - don't round the heads off, they were a little round to start with on mine. then you are looking at the pump. I had read somewhere else that these are actually cheaper at the dealer than many other sources - this was true for me. it was about a $25 part. If I had to do it again, I would take the fan shroud off, it is easy and will give you a bunch more room.

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andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles