Jose 11 #1 Posted September 12 Can anybody help me out with how oil filter shroud gasket is installed? Share this post Link to post Share on other sites
lynnmor 7,303 #2 Posted September 13 Look up Onan 122-0502, I believe that your number is a marked up Toro item. one source The gasket simply pushes in place with the cut out portion at the bottom. If you are experimenting with oil filters other than Onan 122-0800 or Fleetguard LF3339 the gasket may not fit right. It is best to keep the filter clean and dry when installing so there is friction. 1 Share this post Link to post Share on other sites
Ed Kennell 38,114 #3 Posted September 13 https://www.jackssmallengines.com/jacks-parts-lookup/part/onan/1220502?cto_pld=tpbph9y4aaboig4snlq3cq 1 Share this post Link to post Share on other sites
Jose 11 #4 Posted September 13 17 hours ago, lynnmor said: Look up Onan 122-0502, I believe that your number is a marked up Toro item. one source The gasket simply pushes in place with the cut out portion at the bottom. If you are experimenting with oil filters other than Onan 122-0800 or Fleetguard LF3339 the gasket may not fit right. It is best to keep the filter clean and dry when installing so there is friction. Thank you, I was not sure what was involved. originally there was not one there, but I had read somewhere that it is good to have because also could cause low pressure to the fuel pump pulse. which I believe I might be having. 520H 73501 1 Share this post Link to post Share on other sites
Ed Kennell 38,114 #5 Posted September 13 1 hour ago, Jose said: Thank you, I was not sure what was involved. originally there was not one there, but I had read somewhere that it is good to have because also could cause low pressure to the fuel pump pulse. which I believe I might be having. 520H 73501 The fuel pump pulse is generated by the movement of the piston. in the crankcase. I can't imagine how the pressure of the air on the outside of the engine could affect the crankcase pressure. 1 Share this post Link to post Share on other sites
Jose 11 #6 Posted September 13 Yes I understand what you’re saying. I’m not sure how that works but like I said I don’t have one so I need to replace it anyway. Share this post Link to post Share on other sites
Ed Kennell 38,114 #7 Posted September 13 (edited) 10 minutes ago, Jose said: I don’t have one so I need to replace it anyway. Yes, it is extremely important to have that gasket/grommet in place to keep the cooling air moving across the rear cylinder cooling fins. The fins must also be kept clean and free of debris. Overheating of the rear cylinder causing the loosening of the exhaust valve seat is a common problem on these engines if the cooling is not maintained properly. If you use the machine for mowing, the intake screen must be kept clear of debris. I no longer use a twin for mowing, but when I did mow with a 417, I carried a long handled brush to keep the screen clear. Edited September 13 by Ed Kennell 1 Share this post Link to post Share on other sites
