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921 case loader pouring oil out the vent tube

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It takes very little oil coming out that tube to make a GIANT mess under your vehicle.

Almost every 4wd Dodge I know has had this happen at least once. Most times the owners don't know unless they pull the airbox.
Have no idea what causes it but it appears to be "normal".
It makes a mess more than anything, you really don't lose enough fluid to be conserned.

Hope helped.

Posted on May 11, 2010

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Is it straight oil - or water/coolant mixture?

Posted on May 10, 2010

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Posted on Jan 02, 2017

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Front axle vent tube leaks out oil


You are likely to get an oil 'mist' from a vent or breather tube -this is quite normal. The 'mist' cools around the breather and forms a small oily patch. on the axle casing.

Are you certain that the oil is coming from the vent tube and isn't due to a split in the metal casing or from the gasket/seal?

How much oil are you losing? The only other way you would lose oil is if excess pressure was building up inside the differential and to be honest, it's difficult to see how this would occur unless it has recently been over-filled with oil.

If there are drips of oil appearing on the ground underneath the axle/differential chances are that it's the cover seal or the pinion seal at fault. The pinion seal is where the driveshaft/propshaft attaches to the differential. The cover seal is the gasket between the metal cover where the filler plug is and the differential casing itself.

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I justgot a 95 kawasaki 500. i just cleaned the carbs and put in a fuel filter. i put bike back together. there is a black tube running out the back of the bike starting from after the carberatuor an


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1 Answer

Oil is blowing out of tube into filter housing on my 89 Harly soft tail. Bike hasent been started in awhile.is there a check valve? Any info. Thanks.


Yes there is a check valve but it's in the oil pump. This is a problem with the pre-2000 Softails. The oil tank is mounted higher in the frame than the oil pump on the engine. When the bike is allowed to sit for an extended period of time, the oil seeps past the check valve ball in the oil pump and settles in the engine cases. We call this "oil sumping". When the engine is restarted, the oil pump scavenger gears simply cannot pump the excess oil back to the oil tank fast enough and it is blown out of the crankcase vent tube. Since the EPA requires that vented crankcase pressure be cycled through the engine to be burned, the crankcase vent tube is connected to the backside of the carburetor backing plate. There are baffles in the tube but they only work for oil mist. The results is that your air filter gets filled with oil when you restart the engine after a lenghty downtime. Most riders will disconnect the tube from the backside of the backing plate and plug the hole in the backing plate. Then they install a simple hose about six inches long or so to the nipple that comes out of the engine cases and run it back towards the rear of bike underneath it. Some guys will put a small crankcase breather on the end of the hose as well. This way, the oil will go on the ground and you can clean it up. I usually slide a shallow pan under the bike before restarting one that has sat for a while. Avoid "topping off the oil tank" before restarting a bike that has sat for a while. Check the oil level and as long as the oil is visible on the dipstick, restart the engine and check the oil level when the engine reaches operating temperature. Harley improved on this problem in 1993 when they went to the "head breathers" where the crankcase vents are located in the cylinder heads.

Good Luck
Steve

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While my 88 isuzu is running or when you shut it off, oil pours out the vent tube coming off the fuel pump... why is this happing and what can i do to fix it?


Sounds to me that you are getting oil in you fuel, I would take and get pressure tested to see if any crack's in head or block. Good luck.

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1 Answer

Oil blowing out of trans breather tube


hi 81 yamaha i am concerned about the fuel smell coming out with the oil. could be the carbs flooding filling your crankcase with fuel? if not it sounds like you have blow by which would cause your crank case to be slightly pressured. this is caused by worn piston rings. do not plug your crank vent. if you leave your vent open install small filter to stop dirt from entering jim

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