New rings don't seal tight against the cylinder walls. Even though they both look round to the naked eye, at the microscopic level they are very different shapes.
Oil pushes up past the rings through these tiny gaps between the ring and cylinder wall.
The rings and cylinder walls need to "grind" against each other so they match each other's shape perfectly. That's the purpose of honing the cylinder.
Honing puts tiny grooves in the cylinder wall that act like micro-sandpaper on the rings. By the time the grooves are worn away (break-in period) the ring and cylinder fit together perfectly and make a tight seal.
Re-ring jobs are only a partial and temporary fix, if the pistons and sleeves aren't completely shot. It has to be done RIGHT, though. You need to hone the cylinders so the rings will break in. You need to gap the rings to make sure the cylinders aren't too worn for a re-ring job.
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Today's Featured Article - Tractor Profile: Ferguson TO-20 - by Staff. When the infamous "Handshake Agreement" between Henry Ford and Harry Ferguson fell by the wayside (that's a story in itself), Harry Ferguson quickly set up manufacturing plants for a United States version of his English TE-20. The TO-20 was relatively the same as the TE-20 except utilized some different casting materials and had a US-style electrical system. The TO-20 was a dead ringer for the Ford 9N and 2N models and they say that Ferguson did this on purpose when the Handshake Agreement wen
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