Question about 2008 Harley Davidson FLHX Street Glide

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Oil on breather tubes.

I have a 1993 sporty with a hypercharger, I have oil on the breather tubes off side of rocker box. Does anyone know how to fix this problem?

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Not sure how many miles you have but oil on breather tubes (depending on how much) is normal the problem is when you have excessive blowby and high oil consumption. When was the top end done last... If never, it's due....

Posted on Sep 08, 2009

Testimonial: "Thank you for the help. It was a 883 with a 1200 conversion 2 years ago. I had just gotten the bike a few weeks ago has not used any oil yet. "

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91Harley FLH, OIL pouring out of breather tube . Whats problem?


Has the bike been sitting for a while? If so, I may have "sumped". This means that oil from the oil tank flowed past the check ball in the oil pump and flowed into the bottom of the crankcase. If the oil level is low, there is a good chance this is what happened. Only way to get the oil out of the crankcase is to run the bike until all the oil is pumped out thru the breather. Place a pan under the breather hose to catch the oil. Eieset way to solve this problem in the future is to place a clamp on the feel line that goes from the oil tank to the pump. Don't run the bike with the clamp in place! Hope this helps.

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My 2009 1200L sportster leaks oil out the air filter every 2000-3000 miles.It blows onto my exhaust and higher up. I've had my rocker boxes replaced(warranty issue) THREE TIMES- could this be rela


The problem is the the air breathers inside the rocker covers. Sad to say,but nearly all of them do this. One solution is to take off the air filter cover. There should be two bolts..(one on each side of the inside of the housing) that SHOULD have hoses hooked to them. If they do not have the hoses hooked to them,then that is your problem. See,these bolts are hollow,and have a nipple on the ends of them. These allow the top end to "breathe",a crankcase pressure relief if you will.Anyway,..these nipples are SUPPOSED to have a small hose on each of them,that re-direct the oil/crankcase pressure, into the carb/throttle body,which eliminates the oil running into your air filter housing.Check to make sure they are in fact there,and let me know what you find.

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I have a 1993 Heritage Softail, last year I went for a quick ride, stopped at my buddys, 20 min later we left, we got 5 miles down the road, all the oil pumped out the Air filter. I let it cool down filled...


I've run into this problem before. Unfortunately, the owner wrecked the bike before we solved the problem. Here's what I found so confusing. If the top end is filling up with oil and not draining down the return holes in the heads and cylinders, it should drain down through the pushrod tubes. Each tappet has a drain hole in the tappet block to allow oil to drain down and not build up in the tubes. But, for some reason, it seems that the oil simply will not drain back. It acts like there is too much pressure building up in the crankcase. It wouldn't do it on short rides, just on rides of about 20 miles or more.

So, with this in mind, my next step was to pull the nosecone and check the breather gear. As you know, the Evolution engines have plastic breather gears in them and I've seen lots of them break a tooth and quit turning. Usually, the broken tooth gets hung in the return gears of the oil pump and shears the drive key. This requires that this be fixed before the engine can be run and the pressure build up noticed. But, if the broke plastic gear tooth does not lock up the oil pump, the breather gear not turning could be the reason for the pressure buildup in the engine. Now, you cannot simply take the bolts out of the nosecone and pull it off. You must deal with the ignition system first then the cam and tappets. The book says that you must pull the pushrods out and take the pressure off the cam or you will not be able to get the nosecone back on. If the breather gear is broken, you'll have to retime the new one and the cam unless you replace it with one of the new S&S Reed Valve type breather gears that do not turn.

Now, this is just a guess on my part. Since I cannot see or touch your engine, this is the only idea that I know of provided the oil pump is pumping the oil back into the oil tank. It's your engine blowing oil out for no apparent reason. I had the problem on a '91 FXR which is not a head breather. It just leaked oil from everywhere. pushrod tubes, rocker box gaskets, base gaskets, everywhere. I'd like to know what you find.

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Most of the time the oil problem is caused by the little breater "umbrellas" in center rocker box section. Over time of heating and cooling, the little "umbrella" become brittle and fail to seal properly. Crankcase pressure then blows the oil out of the top of the heads and into the breater.

Most people purchase and install an aftermarket breather kit that reroutes the crankcase pressure. This is fine but it does not stop the oil problem, it just keeps it out of the breather and moves it somewhere that it is not as noticable. The proper fix it to remove the rocker boxes and replace the little umbrella seals.

Also, you say that the oil tank is not overfilled but I've see it thousand times on Sporty's. People will check the oil before a ride and fill the tank to the top line on the stick. Too much oil. The stick has two lines, the lower line is "full cold" and the upper line is "full hot". As long as the oil is between the two lines do not add oil to the tank. I've seen the oil filler plug blow out after the oil gets hot. The oil expands as it heats up. Check the oil when the engine and the oil is hot.

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