![]() ![]() ![]() 23 front rotary which was a new concept for the time replacing the rear intake used previously. My first model aircraft engine was a new circa 1952 O&R. Yes, thanks Puffie, that's a good idea about trying it out as a glow, one thing that is worrying is whether it has the early rubber seal between the head and the cylinder, I read that they are prone to leaks, and are nearly impossible to repair because of the "staked" head/cylinder, I just hope it's the later alloy one on this, just have to wait and see! Good tip about removing the piston, and thanks for the detail about the piston baffle position, I'd have been sure to put it back the wrong way round! Spark coils are all the same, but if you want to throw this on a plane, you could look at spark coils for chainsaws, as they are pretty compact. might be a way to try it out while you are looking for ignition parts. The only difference I can see between the O&R spark and glow models is a plastic spacer where the points went and a glowplug on top. the piston has a deflector bar on it, and the narrow end need to point towards the intake, or AWAY from the exhaust. to remove the piston, twist the piston 90 degrees and pull it out from the bottom. they were spot welded together during manufacture so they cannot be taken apart. Puffie40 wrote:I can give you a little bit of advice, as I have dismantled our O&R 29 a couple of times:
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