CNew 404 #1 Posted May 29, 2020 Anyone know what type of O&R engine uses these large, beefy pistons and connecting rods? I’ve never opened up a 20A, is that what this is for? Share this post Link to post Share on other sites
factory 487 #2 Posted May 29, 2020 I don't think that is anything to do with O&R engines, the Series 20A has a one piece crankshaft, no chance of fitting that. Did it come with some O&R spares? I thought I had uploaded the 20A manual. David Share this post Link to post Share on other sites
CNew 404 #3 Posted May 30, 2020 Thanks David. I just didn’t have time to look through the 20A manual last night. I did get it with some other O&R parts. Maybe it’s for a small Tecumseh or something. I’ll be sure to purge it from my O&R spares... Share this post Link to post Share on other sites
factory 487 #4 Posted May 30, 2020 Maybe if you add some dimensions and we could move this to the "What is it?" section, someone might recognise it. O&R stopped using alloy con-rods in the model engines that pre-date the Compact engine, the alloy con-rods couldn't handle the modern glow fuels of the era, the replacement steel con-rods wouldn't bend and the worse case scenario was the cylinder getting blown off instead, or the crankcase splitting. David Share this post Link to post Share on other sites
factory 487 #5 Posted June 2, 2020 For future reference here are the two sizes of piston used for the two types of O&R/AEP Compact Industrial engines. David 1 CNew reacted to this Share this post Link to post Share on other sites
