In years past one of the antifreeze manufacturers (Xerex perhaps?) sold a "2 part radiator flush" that worked very well to remove scale, etc.
First part was an acid powder (oxalic acid I think...) You'd dump the acid into a system filled with straight water, then run the engine for an hour or two for it to circulate and work.
You'd then drain/flush a couple times with fresh water, then dump in the "neutralizer" powder(probably bicarbonate of soda) and let that circulate a few minutes.
Finally you'd drain/flush the system a couple more times with fresh water.
Worked best if you removed the thermostat and partially blocked the radiator to get good (and hot) water flow thru the radiator.
Don't know whether 2 part flush is still around...
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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