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I'm not an engine guy but I have replaced a few rings. really pretty easy.
remove the cylinder and pull it off gently to expose the cylinder. look inside the cylinder for any scratches or metal debris. if there is either one, you may have bigger problems. find the pin on the piston that is used to prevent the ring from rotating. mark the point on the top of the piston. gently pry the ring off the piston and push up and off of the piston, exposing the groove. clean out the groove with a toothbrush or something similar. put some oil on the new ring and gently push it over and on to the piston, finding the pin. holding the ring in with your fingers very gently push the cylinder over the ring, ENSURING that the ring is properly seated and cannot rotate. tighten cylinder and flip the engine over a few times to feel for compression and that the ring is properly seated. I've heard its also a good idea to rough up the cylinder with some 1000 grit or something similar, but I have not tried that. |
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United States, TN, Munford
Joined Jul 2011
333 Posts
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ATWATER,OHIO
Joined Aug 2007
50 Posts
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I tr s always best to hone the cylinder. the ring needs a fresh surface to seal against.
Check your local motorcycle, lawnmower repair shop. They should do it for a minimal fee ..can you do it without ? Sure but if you want optimal performance get it honed and they can also take out the ridge that develops at the end of ring travel. Just two cents from an old gear head. |
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Do Not use a Cylinder Honing tool on a nikasil or chrome or any other type of cylinder plating,,, you will ruined it. Also do not dunk the plated cylinder into an Ultra Sonic cleaning tank because damage to the plating will occur.
A very fine piece of scotch brite with a cleaner of your choice and light finger pressure is all that's needed to clean up a model airplane engine cylinder. Some scratch marks are normal on cylinder walls and pistons,,, deep scratches are not. BV |
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Joined May 2009
1,914 Posts
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No honing for this old man either. Focus here is making sure there's no dirt around, and keeping things well oiled during assembly.
When these fingers can't seem to collapse the ring enough to get it inserted into the cylinder, I've used zip ties/tie wraps or whatever you want to call them, pulled tight to collapse the ring fully. Hose clamps, if properly sized, can work well too! Do not, under ANY conditions, try to force the piston into the cylinder. There's about a 90% chance you don't have the ring lined up on the pin correctly when that happens, and you ARE going to break the ring trying to force it. -Al |
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It may all help by getting someone to assist. Depending on your finger size, using a pair of popcycle sticks to push on the ring on both sides and have someone apply gentle pressure on the cylinder to push it on. Also line up the cylinder as best as possible to you don't have to turn the cylinder with the Piston in it and possibly damage the ring if it gets caught in a port.
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