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Try the FAQ on changing a waterpump on this forum site.
If you can't locate it it's at: http://brickboard.com/FAQ/700-900/WaterPumpChange.htm
There are some really good pictures there. I recently had a problem with my cooling system and if you look at the picture next to step 6, you will see a red pipe which comes from the heater. See the flange on the end of that pipe, well mine was completely corroded away. I had to fix it and getting the old pipe out was a nightmare. I gave up in the end. Got hold of another pipe from a breakers yard near here, cut off the end that goes into the back of the pump, and then cut off the old end on the old pipe and joined them with heavy duty hose. It's been fine ever since.
Fitting a new pump is not difficult. You'll find that the main thing to remember when you fit it is to use new seals on the red pipe and on the top block joint (these should come with the new pump anyway. Two of the mounting holes on the pump have oval holes and this is so that you can lever the pump upwards, and whilst retaining the pump in this position, tighten up the other bolts (I sem to remember that there are 5 or 6 and they are 10mm.
Allow plenty of time. As for your corrosion, you can't really tell until you've got the thing apart, but you'll probably find that you've got a leaking pipe or rubber eal.
Hope this helps you. Good Luck. Keith /Torquay England UK.
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