Recommend using inhibited sulphamic acid. This used to be readily available as a Castrol marine product called DP Descaling Powder - not sure if it is still though. Oxalic acid is also OK and fairly safe to use. It is also available as Olympic Deck Brightener (oxalic acid) from Lowe's. use oxalic acid. it has never hurt the radiator, hoses or engine parts (both iron and aluminum). i get it at the hardware store by buying wood bleach. if you remember the good ol days of car repair there was a product that had a paper tube with the radiator cleaner in one end and the neutralizer in the other end. The cleaner was oxalic acid and the neutralizer was baking soda.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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