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Engine break-in 101

from General Aviation News

Engine break-in 101 General Aviation News You just got your plane back from overhaul and have been told to "break-in" the engine for the first 50 hours or so. What exactly does that mean and how do you go about doing that? What happens during break-in and — perhaps, more importantly — what can go wrong? During an overhaul, the surface of the cylinder is honed to give a cross hatch pattern. If you cut the cylinder in half and examine the cross section of the cylinder wall under a microscope, you would see the surface has tiny peaks and valleys from the honing process. READ MORE

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