Question about Harley Davidson FXR Super Glide Motorcycles
If you look directly behind the oil pump, you'll see a line of three holes where hoses run to the engine on your Shovelhead. The top hose just above and behind the pump is the breather hose for the primary and oil tank. The next one down is the return hose for the oil that collects in the pirmary to be sucked back into the engine by crankcase vacuum. The lowest hose, and probably the one you are talking about is the crankcase vent hose.
This hose vents the crankcase pressure out of the engine. When the bike is allowed to sit for an extended period of time, oil seeps past the check ball in the oil pump and goes into the engine. This is because the oil tank is higher in the frame than the engine and the ball cannot make a complete seal. Now, the oil builds up in the engine cases. When the engine is started, the scavenger side of the oil pump cannot pump all the oil out of the cases fast enough and it's blown out of the crankcase vent. I've seen as much as a quart of oil pumped out of the cases before it stops. We call this condition "oil sumping".
Put a pan or something under the engine when you start it up. After running the engine for a while, the oil should stop. It makes a terrrible mess though. If the oil does not stop after about ten minutes of running or you get more than a quart of oil out of the vent hose, you may have a problem with your oil pump.
The best way to prevent this is to ride or at least start the engine up at least once a week. You can try reseating the check ball in the pump. Sometimes this works, sometimes it doesn't. Let me know if you need any more information.
Posted on Sep 08, 2010
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Posted on Jan 02, 2017
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