RCU Forums - View Single Post - Need To Know Best Way To Reinstall Cylinder on OS 61 SF Engine
Old 02-21-2026 | 08:05 PM
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Crazy Legs
 
Joined: Nov 2002
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From: West Melbourne, FL
Default Need To Know Best Way To Reinstall Cylinder on OS 61 SF Engine

I have an OS Max 61 SF Engine that I disassembled so I could replace the bearings and the pison ring. While replacing the ring, I noticed that there is a small pin in the ring groove, and the ends of the new ring need to stay lined up on either side of that pin. However, for this engine, the connecting rod can't be installed onto the crankshaft pin with the cylinder installed. There's not enough slop in the wrist pin of the piston to allow the connecting rod to be moved rearwared enough so it can slip ofver the crank pin. So that means the cylinder needs to be installed the same way it came out, and that is with the pistion and connecting rod installed in the crankcase first. My question is what is the best way to ensure that the ring ends stay on either sid of the pin in the ring groove? When the piston ring is not in the cylinder yet, the ring ends are free to slide over that pin in the ring groove, and that's what I don't want. Let me know if there's a way to keep the ring in one place while the cylinder is installed in the top of the crankcase and slid over the top

of the piston and piston ring. Thank you. From Mike D'Amico