I do not think anyone can make a knowledgeable decision on the possible damage that has or has not affected the ability of that spindle to remain in service from that picture. I have seen hundreds of those spindles on GM one ton chassis of a former employer I worked for. These were on delivery vans and granted the models I worked on were 77 - 92, but I do not think the spindle set up has been changed much on this newer model. I think there is a heat treatment process that is part of the production process of those spindles that make many of them look like they have been hot. I will say that the discoloration I have seen is mostly on the rough machined and forged area between the machined bearing journals. Now if there is heat discoloration and galling on those machined areas that would warrant a closer inspection. I am more concerned to know if the outside of the races are fitting tight in the hubs. A lot of those hubs in replacement rotors do not have the best tolerances and I have seen them not have the proper press fit. Some I saw had a few high machining lines that held the race snug at first, but after rolling with weight on them and a few heat cycles the races then came loose. You just cannot be sure of the quality of parts you get even from reputable sources. Now if the parts installed were purchased based strictly on an economy price all bets are of. If I could see the spindle with my own eyes and felt it was acceptable for service I would drag a weld rod over the area and work down the arc strike BBs to get the bearing to fit snug again. With this method you actually add metal instead of the center punch method that just displaces metal on the surface. My two cents of course the value of it may equal what you are paying for it.
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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