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Blowing oil back through breather tube - Mtd #TB4SC 25CC 4-Cycle Gas Blower

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1999 honda xr oil coming from vent tube


Hi, Anonymous and the usual suspects are:
1. Oil tank/system overfilled.
2. Faulty breather valve.
3. Engine breather hose bent, pinched, kinked etc.
4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
oil coming from hose
blowing oil out of crank case breather tube
Honda XR250R Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda XR250R Owner Manual

Jun 01, 2014 | 1999 Honda XR 250 R

1 Answer

I have a 94 softail and the dipstick poops out when it warms up


First check your oil level. You could have too much oil in the system.

You could also have a plugged breather system and pressurized oil system, crankcase and oil tank.

If you have an air filter/breather system with rubber tubes that end over the open intake area of the induction module in behind the air cleaner, sometimes people think they should not be positioned like that and bend them back and tuck them into bolt hole areas/openings in the filter backing plate casting underneath the breather tubes look like they should have the tube ends inserted into them and it the tubes are indeed bent back and the ends inserted so, this will close the tubes off and pressurize the engine internally and the oil tank and the pressure buildup will then blow the filler plug and dipstick out of the oil tank.

May 20, 2014 | 1993 Harley Davidson XLH Sportster 883

1 Answer

77 shovelhead w joe hunt mag and s&s oil pump everything is great except after about 20 mins of riding oil start coming out of gasket all around cam cover and mag assembly dont know what would cause...


There ae a number of things it could be. What it sounds like to me is that the oil is not being pumped back into the oil tank and is collecting in the cam chest. It should be blowing out of your crankcase breather tube as well if your crankcase breather tube is open. Behind the oil pump, there are three holes. One is behind and above the oil pump. This is where the breather tube from your oil tank and the primary comes into the engine. The hole directly behind the oil pump in the middle is the oil return line from the very back end of the primary where the oil from the primary is recirculated back into the engine. The bottom hole behind the oil pump is the crankcase breather. It should have a hose that runs back around behind the transmission and just dead ends in a bracket pointed towards the final drive chain. This hose should be open to vent the crankcase pressure. Have you checked to see if oil is being pumped back into the oil tank? If not, the scavenge gears of the oil pump may not be pumping the oil out of the engine and back to the tank. If this is the problem, you may not have the drive key properly installed in the scavenge gears of the oil pump. Still, oil should be pouring out of the crankcase breather hole. But, this is what it sounds like it's doing to me. The oil is building up in the cam chest for some reason.

Good Luck
steve

Sep 06, 2011 | Harley Davidson FXDWGI Dyna Wide Glide...

1 Answer

Honda XR 250 R blowing oil out of breather hoses


Hi, Big_a08 and the usual suspects are:
1. Oil tank/system overfilled.
2. Faulty breather valve.
3. Engine breather hose bent, pinched, kinked etc.
4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
oil coming from hose
Losing oil from crankcase breather hose 06 crf 250r
Honda XR250R Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda XR250R Owner Manual

Jul 24, 2011 | Honda XR 250 R Motorcycles

1 Answer

When i am towing somthing i get a lot of oil down the driver side and on the back of my tailgate of my truck, it only has 123,000 on it and its coming out of the breather tube.is that common.


It sounds like the engine is badly worn. Compression is likely blowing down past worn piston rings creating excessive pressure in the crankcase which then blows out the breather tube. Solution is a used or remanufactured engine.

Apr 10, 2011 | Dodge Pickup Cars & Trucks

1 Answer

I'm getting a lot of oil blow back coming from the vent tube off the side case. What could be causing this.


Blow by is what causes it - Those motors weren't really designed to be turning RPM's all day. You will want to install a oil catch can inline to help pull the oil out of the breather assembly. There is no way to stop it unless you upgrade to the newer XB PCV breather setup.

Nov 12, 2010 | Buell M2 Cyclone Motorcycles

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

2006 Suzuki DRZ400S oil leak from bottom of air cleaner.


Often times there is a engine breather tube that has to do with emissions that runs from the engine to the air filter breather box. This tube can in some cases blow oil through it when the engine is run hard. Make sure you're not over filling the engine with oil when you change it because this will cause the oil to "blow off" the excess and the air box is where it often goes.
There is also another possibility, are you using too much oil in your air filter after you clean it? This too is a common cause for oil in the air box, if that's the case I would not worry about it.
The last case scenario is one you don't want, that would be washed out rings which cause blow by and that in turn causes the engine to blow oil out of the breather tube which I'm confident it venting into the air box.
Please let me know if these resolve your question and if not give me more details and I will be happy to assist you further.
Regards,
RSelvy

Dec 08, 2008 | 2006 Suzuki DR-Z 400 SM

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