Oil in air filter housing

[28560HUNTING]

NOTICED THAT THERE IS ALWAYS OIL IN THE AIR FILTER HOUSING.SEEMS TO BE COMING OUT OF BREATHER TUBE THAT IS ATTACHED TO BOTTOM OF AIR CLEANER ASSM.COMP IS GOOD 175 PSI,OIL LEVEL ALWAYS GOOD ALL LOOKS OK.ANY IDEAS.ANYBODY HAVE THE SAME PROBLEM.MY MACHINE IS A 1996 CONQUEST WITH 600 HOURS ON IT

[Mike]

Two simple checks: Is your oil over the max mark on the dipstick? If so, lower it so that it is in the middle between low and high. Also, if you get in a lot of steep angle situations, this can cause the oil to get back into the filter.

[28560HUNTING]

No steep situations.oil level is just a hair over full do you think this would do that?????????

[swamp donkey]

It's very possible

[spits]

make sure your crankcase breather is breathing properly.

[plott hound]

my old koller kt 17 engine blows oil into filter housing.i gotta keep the oil level below the full line to stop it.

[North Country Tough]

Most not all small four strokes use a reed valve deal to vent the crankcase and although it might look fine it my be goofed up,had a Bigfoot with a Vangaurd that spewed oil into the breather replaced that crankcase vent reed assembly that looked okay and it was fine after that.

[28560HUNTING]

ok gents drained oil down approx 1/4 inch from full mark and still getting oil pushed up into filter housing

[Robert]

I had the very same problem with my 2000 bigfoot . 18 hores briggs , check that the small rubber seal on the dipstick is in fact making a seal when you push the dip stick all the way in ,there should not be any air leaks if this dosn't solve it check and make shure that your valvecover gaskets are seated properly . when i had this problem it turned out to be a valve cover gasket was leaking and it caused oil to be blowen up breather tube into aircleaner area.apparently any air getting in will over pressurise the crankcase
and cause the oil to be blown up breather hose .hope this helps

[westkymaxiv]

i am having this same problem with a 18 hp V twin Vangaurd . I have been adjusting the valves,, maybe i didnt get the gaskets on good. It just started doing this.

[Flying Bone]

compression check time blow-by on the rings or valves aren't closing all the way.