Question about Harley Davidson XLH Sportster 883 Motorcycles

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There's oil blowing out my enghine oil breather

There's oil blowing out my engine oil breather, its not a steady gush but its so bad a problem i've had to disconnect it from my air intake. possible engine oil return blocked?? there is'nt enough oil in ireland to keep this bike running wet for more than ten mins!! lol

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  • Harley Davidson Master
  • 420 Answers

This is common the solution is to run the oil half way between full and low.

Posted on Jun 21, 2009


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Posted on Jan 02, 2017


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Oil pressure low means what

What it means at the very least, repair sensor or add oil due to empty sump. Next less bad: change oil and filter. Next less bad: clogged oil pump screen, change oil pump. Next worse: leaky seals or cracks causing oil to gush out of galleries. Next worse: bearings and journals leaking due to excessive play. Next worse: spun bearing, engine poised to blow. Next worse: hole in engine from moving parts damage.

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Engine breather gushing oil

Hi Anonymous, either your oil system is over filled or the return side of oil pump has failed or is blocked. Good luck

Nov 28, 2013 | Harley Davidson FLHTC - FLHTCI Electra...

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Revtech 110 ON custom bike not sportster blowing oil through the carb

Your RevTech engine is a copy of an H-D Evolution engine. Just as with the Harley engine, it vents it's crankcase pressure through ports in the heads. There are "umbrella valves" made of rubber in the center section of the rocker box covers. These valves are made of a rubber like material and they will harden with repeated heating and cooling. If they get hard enough, they may not work as well as they should. This system does a fair job of removing the oil mist from the exhausted air but there is still some oil left in it. This oil will accumulate in the breather and drip out. You must clean the inside of the air breather occasionally to prevent this. However, if too much oil is coming out, you may have too much blow by on the rings or your breather gear in the cam chest may not be doing as it should. Harley uses a plastic breather gear and I've seen them break a tooth and stop turning. I don't know if RevTech uses a plastic gear or a metal gear. It depends on how much oil is coming out of the breather as to whether or not you have a problem. There are kits available aftermarket to reroute this vented air pressure outside of the air cleaner.

Good Luck

Jun 03, 2011 | Harley Davidson XLH 1000 Sportster...

1 Answer

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.

Good Luck

May 16, 2011 | Harley Davidson FXST Softail Standard...

1 Answer

Peugeot 405 oil blows out of the oil filler

yes their is a breather pipe but if its that bad then either its completly blocked or you need a engine rebuild.The breather is on the front of the engine with a pipe running to the air intake and the dip stick is in the top

Mar 03, 2009 | 1991 Peugeot 405

1 Answer

Oil blows out of tube

You either have a head gasket going bad or your piston rings are shot which causes air to go down into the crankcase building up pressure which exits through the breather tube.

Jan 31, 2009 | Troy Bilt, Tuffy, Rear - Tine Tiller, 4.0...

1 Answer

1994 Geo Metro Oil in breather

sound like the engine is worn out
do a compression test to start.

Sep 24, 2008 | 1990 Geo Metro

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