zeedubbya 18 #1 Posted February 18, 2013 I just went out today to clean up the 520h--it's been sitting in the garage for about a month now. I noticed this oil leak. Looks like a lot? Rest of motor stays pretty clean but i generally don't look behind the PTO. I'm not sure how long it's been building up, but I check the oil before every start and it's been ok? I'm thinking its gonna need a bearing plate gasket and/ or a welch plug. Any advice before I proceed would be much appreciated. I am not looking forward to it! Share this post Link to post Share on other sites
sorekiwi 761 #2 Posted February 18, 2013 I'm guessing that the seal in that bearing plate is leaking. Onans pump so much air from the flywheel that a little leak makes a big mess. Might be worth your while to clean it all off with some brake-clean, and run it again to see if you can pinpoint the leak before blindly pulling it all apart. Share this post Link to post Share on other sites
zeedubbya 18 #3 Posted February 18, 2013 That's great advice--I'm going to do just that this week sometime. It seems putting that oil seal in is a little bit of a job. Share this post Link to post Share on other sites
sorekiwi 761 #4 Posted February 18, 2013 I just looked at an Onan bearing plate and the seal does install from the outer side. There is a crank bearing (white metal type) just inside of that (also in the bearing plate), so I would just remove the pulley and woodruff key, and carefully pry out the old seal (without driving your screwdriver into the bearing!) and install the new one Share this post Link to post Share on other sites
