You shouldn't have to remove the radiator. The shroud is in the way, but the job will go a whole lot easier if you remove the fan and the belts (including the generator belt).
And that will be the key to your belt tension adjustment. Your water pump belt runs off the crank pulley and also drives your fan, and the adjustment for the whole belt is at the fan.
The fan is mounted to a slot on the casting that holds your upper radiator hose. The slot SHOULD hold the nut on the back in place while you loosen the fan up. That is done by turning what looks like a nut (but is actually a part of the fan shaft that is machined into a hex) on the front of the slot. In other words, the shaft threads into the nut on the back of the slot in the bracket. You may have to fiddle and try to get a wrench on that back nut if it turns. If so, just hold the nut on the back side -- but do your turning on the shaft.
With the fan and belts out of the way, it's still close quarters, but you'll be able to go over the governor from the right side to get to the other bolts on the water pump and have room enough to wiggle the pump off the hose. Couldn't hurt to put a piece of corrugated cardboard on the back side of the radiator while you do this so you don't ding up your fins. It might also be helpful getting the pumps off and on to loosen the clamps on both ends of the lower hose to give youurself some added twist the geometry of finaglin' it off.
Getting your belt tension back is a matter of starting the fan shaft back onto the nut when you're done. Tighten it just enough for it to hold, then use whatever in the toolbox works to pry it up enough to get the belt tension right, and hold it there while you finish tightening the shaft onto the nut.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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