Question about 1993 Harley Davidson FXR Super Glide

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Oil is pouring into the air filter from the PVC

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It's not unusual for a little oil to get into the air filter as this is where the crankcase breather tube is routed. The EPA required Harley to do this starting in about 1988 or so.

It depends on how much oil is going into the air filter. If you're getting a little oil in there and it builds up over a period of time, this is not unusual. However if you're get a hugh amount of oil in it, it could be one of two things.

The first is not too bad. If the bike has been sitting for a long period of time, oil will seep past the check ball in the oil pump and "oil soak" the bottom end. The oil in the tank will be low because the oil is in the crankcases where it's not supposed to be in a Harley. When the engine is in this situation and it's started up. The amount of oil in the bottom end cannot be pumped out fast enough by the oil pump and it's blown out the crankcase vent tube. Which, in this case goes into the air filter. Really makes a mess. We normally disconnect the tube and put a large pan under the bike and allow the oil to pump out into the pan. Once it's cleared itself out, everything is fine until the bike is allowed to sit for an extended period of time again.

Now, there is another problem that it could be. In this case, the oil tank will be pumped dry and all the oil will be in the engine. If this happens, the plastic breather gear in the "nose cone" may have broken a tooth off the gear and is no longer allowing the oil to be transferred from the crankcase to the gearcase. The broken tooth of the plastic gear can shear the key for the scavenge side of the oil pump. In this case, you can tell this because when you look into the oil tank with the engine running, no oil is being pumped back into the tank. You may need a flashlight to see into the tank. OIl will also be coming out of the pushrod tubes as well.

More than likely, it's either a buldup of normal blowby or an "oil soaking" condition.

Good Luck

Posted on Jul 06, 2010

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This is something that does happen usually after a major tune up and even after,as long as it is'nt leaking down the side more then a drop or so don't worry!

Posted on Oct 06, 2010


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