Actually, some manufacturers are claiming that with their tighter machining tolerances today they don't require a break-in period.
Cummins claims that if you pull the plunger from the injector from a new heavy-duty engines, draw a line around it with a dry erase marker, and try to put it together, you will fail. The ink from the marker will be thicker than the clearance.
Ring and pinions do wear into each other some. Basically they are smoothing out the contact areas. Unless they aren't set up properly. I've read in truck magazines that tires need to break in, too, that they can get better fuel mileage once they wear some.
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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
... [Read Article]
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