Air Breathers Pumping Oil

[man-of-war]

This is a picture of the KNN air filter with the rocker cover air breathers attached. After a weekend run the air filter is swamped with oil and dripping. How can I fix this?<br />

<br />Thank you

 

[stnick]

Re: Air Breathers Pumping Oil

Beautiful engine! There should not be enough crankcase pressure to force oil into the air filter via the valve covers. Have you changed something lately? Crankcase pressure is "usually" related to "blow by" in the cylinder(s). "Compression is leaking by the rings and pressurizing the crankcase". Hopefully you have another problem causing this.<br />Good luck,<br />Nick<br />Try removing the oil fill caps on the vale covers while the engine is running. You should NOT have oil blowing out of them.

 

[Don S]

Re: Air Breathers Pumping Oil

You probably have a ring problem from having gas in the oil.<br />You never did fix that problem, you just tried your ideas of how to fix the fuel system using electric fuel pumps and finally using a regulator, but it didn't work soon enough.<br />You may think I sound negative, but you did it to yourself by not fixing the problem before the rebuild. All you did was moved the problem to the new engine and took it out also.

 

[rodbolt]

Re: Air Breathers Pumping Oil

you may wish to pull the rocker covers and see if the baffle is installed. its possible that a pushrod oil tube is lined up with a non baffed hole.<br /> if not its time for a leak down test to check for poor ring seal or a broken ring.

 

[Haut Medoc]

Re: Air Breathers Pumping Oil

I am not an expert, but there are an awful lot of fancy "Doo-Dads" on your engine....You need to try to get back to the original configuration to get your boat to run in a safe and reliable state....IMHO.....It sure is purdy though.....And I'm not trying to be a wise a$$, but you really do have alot of after market stuff that needs to be adressed....JK

 

[Bt Doctur]

Re: Air Breathers Pumping Oil

I wont go into whats wrong with the engine pic.esp. the fuel line but following this post no one has mentioned IF the cam is suitable for this marine application. I wonder what the lift/ duration is and could this be a reason for the oil misting issues.most extreme hi lift long duration cams for more horsepower usually use dry exausts to prevent moisture being sucked back into the engine.

 

[man-of-war]

Re: Air Breathers Pumping Oil

I'm just frustrated of the running around with this engine... When the mechanic did the compression test he gave me the compression numbers which I posted. He also said the leak down test was normal. I'm going to do my own leak down test tomorrow.<br />They thought about the high lift cam when they built the risers. The water exits are way down the exhaust.<br />

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<br />These are some pictures of the rocker cover air breather holes. I don't know if this will cause oil to come through the breather hole<br />

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<br />These are the breather caps. One has the sponges eaten away inside by having gas flowing through it.<br />

<br />The cap doesn't seal to the rocker cover because of these rubber seals.<br />

<br />Thanks guys

 

[man-of-war]

Re: Air Breathers Pumping Oil

just a thought.if i was to tap into the intake manifold,and put a 1/2'' (T) adaptor.which will connect to the air breather's.Will this help with the crank case pressure??? THANKS

 

[Dunaruna]

Re: Air Breathers Pumping Oil

No.

 

[rodbolt]

Re: Air Breathers Pumping Oil

your going to have to baffle those holes. were it mine I would eliminate 4 of them and baffle one on each side at take them to the flame arrsetor. <br /> but we know now why so much oil is coming out . also check the cooling water distribution hose where it enters the exhaust manifold. make sure it cannot come back down the manifold. looks like it can. the water exit has nothing to do with a high lift cam. if valve overlaap is to much it will require over the transom dry exhaust or a speacial jacket. the pressure waves of a radical cam will pull water 20 ft if it needs to at idle speeds. the problem is intensified it the heat cross over passages in the heads have been blocked off.<br /> while its nice to see all dem dar goodies dont be suprised when a person with a tad of knowledge and a mostly stocker walks by ya. there is a lot more to high performance boating than autos and most of its in the drive/prop area.<br /> proplem is conventional props become terribly inefficient above about 25-2600 RPM at the prop shaft.

 

[man-of-war]

Re: Air Breathers Pumping Oil

Thanks again,the baffles risers that u see on the rocker covers are blocked off the person that owned this boat did that.the two oil fill holes on the covers both have a metal plate inside the cover to provent oil from splashing up .the only two that dont have the plate is the two air breathers....is the baffle that metal plate thats below my oil fill holes ? this is not going to sound good, on the weekend i over filled the crankcase by 2.5L of oil due to the dipstick blow out.could this have caused the oil to spit like it did?? thanks

 

[AaronG]

Re: Air Breathers Pumping Oil

Try taking those up close pics with the macro setting on your digital camera switched on. Its symbol is sometimes a picture of a flower. That way your up close pics won't ba all blurry. Make sure flash is off.<br /><br />-Aaron

 

[prockvoan]

Re: Air Breathers Pumping Oil

Sorry to be so hard,its time for you to just quit working on your boat and find someone that can and knows how.I had been reading most of your post,with all the problems that you had and still have.You must have a open pocket or a lot of time to kill.Sounds like you just keep shotting yourself.<br />Boating should be fun,not a fight.Quit trying to invent the wheel!

 

[Bondo]

Re: Air Breathers Pumping Oil

the two oil fill holes on the covers both have a metal plate inside the cover to provent oil from splashing up .the only two that dont have the plate is the two air breathers

The Oil Fill(s) have been Switched with the Vents,........<br />Switch them Back to where they're Supposed to be...........<br /><br /><br />BTW,........ You only Need 1 Oil Fill Hole....

 

[f_inscreenname]

Re: Air Breathers Pumping Oil

Look this is all you need. The rest is problems waiting to happen. It also looks like you have the room. You may want to try a set of high rise valve covers so they will have to proper baffles and clear your rockers.<br /><br />

 

[man-of-war]

Re: Air Breathers Pumping Oil

nice engine, ive never seen what a normal engine supposed to looks like,could you show me the front of the engine?

 

[Bondo]

Re: Air Breathers Pumping Oil

That's Not Quite a "Normal" Marine Engine,.........

 

[f_inscreenname]

Re: Air Breathers Pumping Oil

" That's Not Quite a "Normal" Marine Engine,......... " <br /> <br /> <br /><br />

 

[man-of-war]

Re: Air Breathers Pumping Oil

are your air breathers on the oil fill cap? THAT'S A COOL ENGINE, IS IT A 454? WHATS YOUR WOT SPEED? .....when i get over this problem on who's going to rebuild the engine.i will get some rockercovers like that,looks simple enough.

 

[rodbolt]

Re: Air Breathers Pumping Oil

nope thats not a normal marine engine, it also wont passany coast gaurd safty inspection. I would instanly ticket it for the fuel and vapor set up. not only is the cranckcase breather system not in compliance neither is the fuel line and filter between the pump and the carb. another fine example of a non conforming boat.<br /> I actually think some of the K&N filters are rated. on the filter I would have to look for the SAE number to see if it was conformong or not.