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The engine "sumped", meaning the oil in the oil tank leaked past the check ball in the oil pump and is now in the bottom of the crankcase. Place a pan under the breather tube and run the bike until no more oil comes from the breather. keep an eye on the level in the oil tank. You don't want to run it dry. If you added oil, chances are the dipstick will fly out due to too much oil pressure. When you're done, either change the oil and filter, or add oil to the tank.
This tube comes from the Air Box. If the oil level is to high in the crankcase, the PVC port, which is located in between the "V" of the two cylinders is actually vacuuming the oil right out of the crankcase, and it is collecting in the air box. When enough oil collects in the air box, ti runs down the overflow tube, and drips out behind the rear wheel. To check the oil level, put a 2X4 under the side stand, make sure the bike is level, (a helper to steady the bike is a good idea here) look at the sight glass on the lower right side of the engine, down by the water pump. The oil level should be 1/2 way up the sight glass with the engine cold, and not running. If the oil level is higher than 1/2 way up, drain some of the oil out until you can see the oil level read 1/2 way on the sight glass. These engines only take a little over 3 qts. of oil with a new filter. If you are putting in 4 qts. of oil, it is too much. Earl
On your '93 model, the crankcase vent is down low on the engine behind the oil pump and it runs up to the air filter through a metal and rubber hose. I don't know how many miles you have on your engine but it you're getting any blow-by on the rings, this will increase the pressure in the crankcase. Most people simply re-route the crankcase breather underneath the bike and plug the hole on the backside of the air filter. Replace the metal line with a rubber hose and put a small filter in the end of the hose. Route the hose back behind the transmission and attach it to the transmission mounting plate just in front of the rear wheel.
This was the way the older Shovelheads were done from the factory for years until the EPA made them start running the crankcase vented air through the engine. In 1994, Harley went to the "head breather" system and moved the crankcase vents to the heads. Still, the oil mist in the vented air builds up in the air cleaner on these models as well.
Most likely the breather tube has filled your air box with oil. If it has , you may need to replace your air filter. If you look under the motor you will see tubes in front of your rear wheel. The tubes that are capped are called pollution tubes. these need to be emptied periodically. Place a pan under the tube and pull the plug and all the nasty junk will pour out. If there is a lot of oil this may be the source. Replace the plug. Wash your bike with an engine degreaser, then take it for a short drive. Be sure you rev the motor up with some hard acceleration. Then look it over carefully to see the location of the leak. If the bike was run with too much oil the crankcase breather was probably not breathing correctly and blew out a piece of a cover gasket high on the motor. If the gasket had blown out below the oil level you would have a puddle under your bike. If a seal was pushed out you may be able to press it back in. If damaged , replacing the seal may be the only option.
Remove oil pan oil pump and pick up tube & screen will be bolted on. You should get oil pump lube, carb. cleaner, new pump oil, oil pan gasket, silicon, oil & filter, loc-tight, gasket remover & tools metric, 1/4 drive socket set, scraper / putty knife, 2 jack stands, a jack or ramps, & blocks for rear wheels. Lets get started.
(1)Get your car up on stands or ramps block rear tires.
(6)Now clean tube & screen with carb. cleaner place on news paper to dry.
(7) clean all old gasket off from engine & pan also clean bolts
(8)place silicon on pan place gasket on pan put bolts in from gasket side to Aline holes put a side to dry
(9) Attach tube to pump with a little loc-tight fill pump with oil pump lube
(10)attach pump to engine block make sure rod goes in proper & bolt are tight.
(11)Bolt pan back on engine using a 1/4 in drive ratchet don't over tighten bolts get all bolts in now slow run each bolt in starting at 1 end then jump to the other then go to bolt at other end a cross from 1st bolt. Do this till all bolts are ran in. Now tighten bolts look for gasket on side of pan.If it starts to push out stop go to next bolt.
(12)Instill new filter & drain plug,& pour in oil
(13)Replace Neg - cable
I hope this works for you it's a basic oil pump change for most cars. Some take more steps.
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.
if the oil tank is above the crank case,
inspect the oil pump check valve. go online and study the check valve's functional purpose and see to it that the vale is operating properly. it should not be an expensive fix.
if you reroute hose be carefull of rear tire annnd what does the oil level in the oil tank sit at when full and after the leak happens after -say a day of riding- a week
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