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It really depends on how far down the piston travels in the bore as well as if this is the thrust side of the piston or not. If the piston skirt travels lower than where the chip is at, the only option you'd have to reuse the block is to get a new cylinder liner installed into the block. In most cases with small engines, this doesn't make economic sense. You ...


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Yes and no, with blind guess your piston is usually made from composite aluminium, and a screwdriver is usually hardened steel. You can guess which one is harder. If the piston just gets a small scratch then it is ok (usually), and most likely your spark plug hole will dented. But the chipped part of the piston (if) could damage your engine further. The ...


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TLDR: To do it right and not have to do it again in a month (or possibly right after start up), the only way to fix this is to either pull the crankshaft and have it turned, as well as check the connecting rod, or replace the engine (might make more economic sense to do this, depending on the engine). There's a whole other part to this nobody here is seeming ...


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The bearing material is softer than the crankshaft, so any imperfections will chew up the bearing. There is no way you will get an accurately cylindrical shape with the correct diameter and surface finish using emery paper, even if you think you have polished out the scratches. Any imperfections in the shape will also tend to destroy the oil film in the ...


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Oil from the crankshaft rotation is thrown against the cylinder walls during engine operation. This is oil escaping from the rod bearing. When the piston comes down in the cylinder, the bottom rings (usually a pair, called oil control rings) scrapes the cylinder pretty much clean of oil. There is a very small amount left behind on the cylinder walls which ...


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there are several ways that rings are lubricated for example in a two stroke its done by means of petrol /oil mix in certain 4 stroke engines you will find a jet which sprays oil onto the bore and skirt of piston and as stated the oil scraper rings do not remove all oil also the cross hatch in the cyl holds a degree of oil which provides some lubrication


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