snowhound 105 #1 Posted July 18 I have a 417-8 with a series 2 engine that is pushing oil through the points. It has a length of 1/4 gas line that is being used as a breather tube, was like that when I got it, could that be causing the oil issue. If the hour meter is correct it has 2000 hours on it. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,075 #2 Posted July 19 The crankcase should be under a vacuum when running to prevent oil from leaking. The oil fill cap and dipstick must be sealed to accomplish this. There is as much air moved below the piston as there is going through the combustion chamber. The check valve in the breather item #14 lets air out but stops it from returning. That is how the vacuum is created. https://www.partstree.com/models/kt17-24323-kohler-series-ii-k-series-engine-made-for-wheel-horse-17hp-12-7kw/breather-vent-3-15-3-2/ 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,075 #3 Posted July 19 The point push rod #5 is not sealed but the close tolerances do not allow oil past it under vacuum. Never hear of a rod wearing. https://www.partstree.com/models/kt17-24323-kohler-series-ii-k-series-engine-made-for-wheel-horse-17hp-12-7kw/ignition-12/ 1 Share this post Link to post Share on other sites
wallfish 17,025 #4 Posted July 19 Same guess, check the breather first. There's too much case pressure. But that condition could also be caused by blow-by. Worn piston rings and worn cylinder wall will allow blow-by of pressure into the case. 2000 hours on an original engine, just say'n. 5 Share this post Link to post Share on other sites
