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Oil running out of crankcase breather - FXR Super Glide Harley Davidson Motorcycles

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Sorry to say but your HD bike got a big BLOW BACK!
Check your PiSTON ring, the compression pushes some air into ur crankcase and into ur breather!

Posted on Nov 07, 2010

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Posted on Jan 02, 2017

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What should the compressin be on a briggs


What is the compression ratio for my engine?

Briggs & Stratton side valve (L-Head) engines use a compression ratio of 6 to 1.Our Overhead Valve (OHV) engines use a compression ratio of 8.5 to 1.

What would cause my engine to "puff" smoke while it runs?

White/blue smoking usually indicates the burning of oil. Causes to this condition include:
  • Overfilling the crankcase with oil
  • Incorrect oil grade
  • Operating engine at greater than a 15 degree angle
  • Inoperative crankcase breather
  • Crankcase air leak
  • Blown head gasket
  • Worn cylinder and/or rings
  • Turning/Tilting the engine on its side for any reason (storage, changing oil, etc). If the engine has to be tilted, ensure the spark plug is facing upwards to help prevent oil from escaping the crankcase.
Also, be aware that any small air leak can cause an excess of air entering the crankcase and will create a higher oil mist than the breather is capable of handling. The excess oil will then return through the breather tube and back to the air filter. Engine oil capacity is dependant on your specific engine model. To determine your engine's oil capacity, please visit our Oil Capacitypage. Oil level checking and changing intervals are available on ourMaintenance Schedule page, as well as a hyperlink (text highlighted in blue) leading to oil changing procedures.
The "Oil" section of your Operator's Manual also contains this information. Other possible causes include operating or tilting the unit at an angle, an obstruction in the breather tube (located behind the air filter), damage to the cylinder/piston rings, etc.

Jul 23, 2015 | Garden

1 Answer

What causes oil to blow out of crankcase breather?


Probbaly worn compression rings. Do a compression check warm and then a leakdown test of compression is low.

Sep 09, 2014 | Motorcycles

1 Answer

My Gravely 2011 0 turn model number 915146has a briggs and stratton engine smokes like it is burning oil. I change the oil religiously with good 30 weight oil.


in dusty conditions the crankcase breather will clog , in which the crankcase builds excess causing oil to be forced by the rings.
clean the crankcase breather.

Mar 16, 2013 | Measuring Tools & Sensors

1 Answer

Oil is coming out of the air beather


This is a common problem. Now the heading says your bike is a 1979 Sportster. Regardless of what it is, there is a crankcase breather that is routed to your air cleaner. This was done to satisfy the EPA regulation that crankcase fumes must be run through the engine to be burned. With the crankcase air come a mist of oil. This oil builds up in the air breather and runs out. You have to clean the air filter out periodically. You can find the crankcase breather hose and re-route it somewhere else so the oil won't go into the air filter.

Good Luck
Steve

Apr 10, 2011 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

Oil is getting on air breather 2004 ram hemi


Hi,
oil getting on a breather can indicate excessive crankcase pressure. Check all the `crankcase breathers and the valve cover breathers.

if the crankcase has been overfilled with engine oil. The crankshaft has to "beat" it's way through the oil and thus acts as a pump and sends oil all over the internal surfaces of the crankcase.

If the engine cylinders have developed 'blow-by" they will also contribute to an increase in crankcase pressure which will be evident by oil in the breathers. The fumes / pressure in the crankcase are designed to be removed by the engine breather system, and drawn through the engine etc.

I hope this info helps.

Jan 25, 2011 | 2004 Dodge Ram 1500

2 Answers

Oil blowing out throttle body on filter and blowing down the side of bike. I had a new crankcase breather valve kit installed one month ago. It was fine until two days ago. All o-rings were replaced also.


The oil may not be coming out of the throttle body. The crankcase breather system is actually in the rocker box covers. Yes, there is a breather gear in the crankcase but that is for the oil return to the oil pump.

The crankcase ventilation system vents crankcase pressure into the air cleaner as required by the EPA. The purpose is to route oil mist contained in the crankcase ari that is vented into the engine to be burned. There are 'umbrella valves" in the center section of the rocker boxes. Over time, the heat makes these pieces get hard and brittle since they are made of a type of rubber. When this happens, they don't stop the oil mist as well as they used to. The oil mist is blown into the air filter where it coaleses into drops of oil. This is normal for any Harley due to their engine design.

But, if it's too bad, I'd suggest replacing the umbrella valves. Simply remove the top and center section of the rocker boxes by removing the six bolts that hold the parts on the top of each cylinder. Replace the umbrella and the edge gaskets and replace the covers. Torque the bolts to 10-13 foot pounds.

Good Luck
Steve

Jun 21, 2010 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer

89 Harley FLTCU oil coming from the crankcase breather tube and


This is an age old problem for the Harley engine. In you 89 model, the crankcase breaths from behind the oil pump through a tube that runs to the backside of the air filter assembly. Most people that I know, simply remove the tube coming up to the air filter and block the hole in the air filter assembly backing plate. At the breather, they run a short hose to just behind the transmission and cut it off there. This is similar to the earlier Shovelhead engine and the way it breathes. In 1994, Harley went to the "head breather system" which was better but it still gets oil into the air filter assembly.

There is one thing I saw on the aftermarket assessories market once called a "CatchCan". The breather tube ran to it and it seperated the oil from the air and the held it in a small container to be emptied on a regular basis. I have never used one nor have I ever seen one so all I can tell you is what the book said. Matter of fact, I cannot remember where I saw it now. Custom Chorme catalog, maybe. Good Luck, Steve

Apr 30, 2010 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Crankcase breather


If the bike sits for a while, and then you run it and shut it off, it will drip.. run it more often.

Apr 26, 2010 | 2000 Harley Davidson FLSTC Heritage...

1 Answer

Oil in air breather


sounds like you have too much oil in the engine (should normally be around 500-600ml when there is too much oil, it gets past the piston rings and pushes it through to the head.

May 20, 2009 | Briggs & Stratton Briggs Stratton Vanguard...

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