erickson13455 1 #1 Posted November 2, 2015 There is a "plug" above the PTO on the front of my D160 with onan engine. Looking at carb today and I saw this plug looking thing sitting on the PTO. I can see where this goes on the engine, but it looks threaded on the engine. I just have a thin circular piece of metal. There is also some oil coming out of this hole. What is this hole for? Why did this plug come out? Share this post Link to post Share on other sites
Sea-Duck51 55 #2 Posted November 2, 2015 There is a "plug" above the PTO on the front of my D160 with onan engine. Looking at carb today and I saw this plug looking thing sitting on the PTO. I can see where this goes on the engine, but it looks threaded on the engine. I just have a thin circular piece of metal. There is also some oil coming out of this hole. What is this hole for? Why did this plug come out? can you post a pic,have a D160 myself might be able to help you out. Share this post Link to post Share on other sites
erickson13455 1 #3 Posted November 5, 2015 I will try to post a pic tonight. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,510 #5 Posted November 7, 2015 (edited) Surprised you don't have an answer yet.I will guess that looks like the end of the camshaft. The plug is likely a Welsh plug which is dished. Get a new one. Add a very thin layer of non-hardening gasket sealer to the very inside edge and the outside edge of the cup. Place it in the cavity and hold a ball peen hammer on the curved outside surface. Hit the first hammer with a second hammer which will flatten the cupped plug which expands the outside diameter to secure it in the hole.GarryAddingTry the new plug in the hole first to make sure there are no burrs preventing it from seating properly. You may need a magnet to pull it back out. Then apply the sealer. Edited November 7, 2015 by gwest_ca 2 Share this post Link to post Share on other sites
erickson13455 1 #6 Posted November 7, 2015 I have the original plug that fell out. Is it still useable? If not where would I get a new one? What type of sealant, RTV? Share this post Link to post Share on other sites
mikekot3 93 #7 Posted November 7, 2015 (edited) I would use some yellow gas line Teflon tape or some Teflon paste. On marginal applications of worn fittings I find the yellow tape works better especially on pressurized lines and plugs. It is available at home depot.Be careful not to wrap too much on it as it will get cut and small pieces can get in the oil galleries can plug it up.One or two wraps around the plug should be sufficient. Edited November 7, 2015 by mikekot3 Share this post Link to post Share on other sites
Sea-Duck51 55 #8 Posted November 7, 2015 I would try using the old one,not sure you can find one new,clean off both surfaces and try to re-install like earlier poster stated. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,510 #9 Posted November 7, 2015 The old one didn't stay in so I would not trust it again.Found the 1978 part number 201011 has been changed to 57-9690 and still available from Toro but don't know what year of Onan you have. They may be all the same. http://www.partstree.com/parts/toro/parts/57-9690/You may know these as frost plugs - same thing and they come in sizes varied by 1/32". An automotive jobber may identify the diameter using the old one.The sealer I would use is called an aviation sealer and the non-hardening type. Permatex makes it now. If the plug is spotless like cleaned with brake cleaner the sealer sticks to the plug real well.Garry 1 Share this post Link to post Share on other sites
Sea-Duck51 55 #10 Posted November 7, 2015 The old one didn't stay in so I would not trust it again.Found the 1978 part number 201011 has been changed to 57-9690 and still available from Toro but don't know what year of Onan you have. They may be all the same. http://www.partstree.com/parts/toro/parts/57-9690/You may know these as frost plugs - same thing and they come in sizes varied by 1/32". An automotive jobber may identify the diameter using the old one.The sealer I would use is called an aviation sealer and the non-hardening type. Permatex makes it now. If the plug is spotless like cleaned with brake cleaner the sealer sticks to the plug real well.Garry that's why your the expert. Share this post Link to post Share on other sites
erickson13455 1 #11 Posted November 7, 2015 I would say frost plug is close. this isn't a threaded plug. i will look up plug you suggested. Share this post Link to post Share on other sites
