j3pearl 0 #1 Posted November 5, 2021 (edited) oil is being sucked into the airbox sorry guys its a 520H with a Onan p220g Edited November 5, 2021 by j3pearl Share this post Link to post Share on other sites
Snoopy11 5,718 #2 Posted November 5, 2021 (edited) 8 minutes ago, j3pearl said: oil is being sucked into the airbox Overfilled crankcase...Bad piston rings. Scarred cylinder sleeve... clogged pcv... incorrect oil weight... (Considering that I might have missed something here... other engine builders will be along...) Don Edited November 5, 2021 by Snoopy11 Share this post Link to post Share on other sites
Snoopy11 5,718 #3 Posted November 5, 2021 You wouldn't mind posting more information here about the engine itself... what type, if you have done any diagnostics like leak-down test... or anything to that effect...? Don Share this post Link to post Share on other sites
stevasaurus 23,276 #4 Posted November 5, 2021 the title of your thread should hint at the problem...I changed it for you. 1 Share this post Link to post Share on other sites
j3pearl 0 #5 Posted November 5, 2021 59 minutes ago, Snoopy11 said: You wouldn't mind posting more information here about the engine itself... what type, if you have done any diagnostics like leak-down test... or anything to that effect...? Don Don its a wheelhorse 520H with Onan p220g. oil is being suck up through the breather tube on the front valve cover Share this post Link to post Share on other sites
Snoopy11 5,718 #6 Posted November 5, 2021 13 minutes ago, j3pearl said: oil is being suck up through the breather tube on the front valve cover More than likely... it is getting blown from the valve cover to the air filter. You can run a catch can temporarily... rather than having it go onto your air filter... but this is 100% temporary... Don Share this post Link to post Share on other sites
WHX?? 51,732 #8 Posted November 5, 2021 Try servicing the breather. page 6-2 in the manual below. 492-4006 Onan P216 P218 P220 P224 SM.pdf Share this post Link to post Share on other sites
JoeM 8,334 #9 Posted November 5, 2021 How much oil we talking about? There is always some residual oil in the intake box. 1 Share this post Link to post Share on other sites
Snoopy11 5,718 #10 Posted November 5, 2021 12 minutes ago, JoeM said: How much oil we talking about? There is always some residual oil in the intake box. I am under the impression... a very noticeable amount... Don Share this post Link to post Share on other sites
lynnmor 7,813 #11 Posted November 5, 2021 Do a compression test to see if the engine is healthy. If compression is good, do the breather service as stated above. Be sure that the rubber tube is in good condition. Share this post Link to post Share on other sites
JoeM 8,334 #12 Posted November 5, 2021 (edited) Hours on the engine, oil usage? does it smoke and if so when, cold hot both all the time, the tests and service the guys are talking about are easy and cheap. pictures are always good too Edited November 5, 2021 by JoeM Share this post Link to post Share on other sites