Liberty work shop 9 #1 Posted June 6, 2022 Anyone know how many hours these Onans will typically go before they have the valve seat problems , or can it happen at any amount of hours ? Thanks ... Share this post Link to post Share on other sites
Liberty work shop 9 #2 Posted June 6, 2022 Also meant to ask how many hours are these Onans good for ? Thanks again ... Share this post Link to post Share on other sites
lynnmor 7,815 #3 Posted June 6, 2022 1 minute ago, Liberty work shop said: Anyone know how many hours these Onans will typically go before they have the valve seat problems , or can it happen at any amount of hours ? Thanks ... It happens about one hour after the operator decides to abuse it by having the air screen clogged, the engine fins clogged or the oil filter grommet removed. People can break an anvil. A properly maintained Onan will last thousands of hours. 1 Share this post Link to post Share on other sites
Liberty work shop 9 #4 Posted June 6, 2022 Except for generators and welders , this is my first experience with the Onan and just wanting to get a feel for what to expect from it ... Goes without saying ( for most of us ) that running any air cooled engine without proper air flow is gonna destroy it in short order ... But the oil filter grommet ?? Not sure what you're referring to ... Share this post Link to post Share on other sites
lynnmor 7,815 #5 Posted June 6, 2022 41 minutes ago, Liberty work shop said: But the oil filter grommet ?? Not sure what you're referring to ... Share this post Link to post Share on other sites
JoeM 8,334 #6 Posted June 6, 2022 I have seen them go over 3000 hours and I had one on 520 at 2500, It rattled a little but no other issues. Lynn hit the nail on the head with cooling. 1 Share this post Link to post Share on other sites
JAinVA 4,636 #7 Posted June 7, 2022 (edited) There is supposed to be a rubber seal at the oil filter area of the engine tin. Belt guard modifications to increase airflow are an option. They also help with checking on debris buildup on the rear fins. Edited June 7, 2022 by JAinVA 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,474 #8 Posted June 7, 2022 Item #9 is the grommet in this illustration https://www.partstree.com/models/41-20oe01-520-h-toro-garden-tractor-1990/oil-filter-26/ 1 Share this post Link to post Share on other sites
squonk 43,799 #9 Posted June 7, 2022 Make sure the bolts around the PTO side of the crankshaft are tight. I had one where they loosened up and started dumping oil everywhere. Share this post Link to post Share on other sites
Liberty work shop 9 #10 Posted June 10, 2022 Thanks for all the replys ... Share this post Link to post Share on other sites