Question about 1993 Harley Davidson FLSTF Fat boy

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Oil leaking out of air cleaner already replaced breather valve 1998 fatboy help me

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  • Harley Davidson Master
  • 3,506 Answers

TOO much oil likely, run at halfway between ADD and FULL and check it HOT

Posted on Oct 18, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 280 Answers

SOURCE: oil leaking through the air breather. oil is

Just a possibility, i found this worked on some cars with similar problem (at least reduced the amount of oil going up the pipe)

Add a (bit at a time) bottle of STP oil treatment, the thick gooey stuff, it should increase the surface tension of the oil, keeping it in one piece, not splitting up and splattering around --> thus being less readily exhaled up the blow-off pipe.
just a thought. this will also increase the compression a little since it thickens the oil, will take up a little wear too coz it likes to cling on to bearings.

Posted on Apr 30, 2009

  • 311 Answers

SOURCE: Oil breather problem,2005 FLHTC-I

if you have oil and smoke coming out of the breather on any engine it is a good indication that the piston/piston rings or valves are damaged,what is happening is the fuel oil,smoke is bypassing the piston or valves and coming out through the breather,i would seriously look atgetting it sorted before any more damage occurs,sorry but it doesnt sound cheap,hope this helps

Posted on Jul 06, 2009

OneRide
  • 379 Answers

SOURCE: HD 1979 fatboy fuel petcock valve leaking

Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.

Posted on Jul 23, 2009

v2iper
  • 150 Answers

SOURCE: i changed my oil and filter now oil is leaking

you put to much oil in. drain some off. some oil in recirculated through breather hose's going to the air filter. If u over fill more goes in then can be handled and it drips out of airfilter and onto bike. dont put in a full 3 qts just 2.6

Posted on Oct 06, 2009

wd4ity
  • 4565 Answers

SOURCE: when starting oil shoots out breather tube on air

It sounds like you have a condition we call "oil sumping". This is common on Softails and the old Shovelhead bikes. What is happening is when the bike is allowed to sit up for an extended period of time, the oil in the tank seeps past the check valve in the engines oil pump and collects in the engine cases. When the engine is started, the crankcase pressure blows the excess oil out of the vent which is in the air cleaner. The reason it does this is because the oil tank is higher than the engine. I thought Harley would have figured out a way to prevent this from happening in the new Twin Cam engines but I suppose they didn't.

Now, on the older Evo engines, you could reface the seat in the oil pump and stop this most of the time, but I don't know how to stop it on a Twin Cam since they've got a completely different oil pump.

On an Evo, there is another thing that would cause this as well. If you had something come through the oil pump and it locked the scavenge gears up and sheared the drive key, all the oil in the tank would be in the engine. This would cause oil to blow out of the air cleaner as well.

Check the level of the oil in your oil tank. The stick has two marks on it. The top mark is "FULL HOT" and the lower mark is "FULL COLD". Do not overfill your oil tank.

Good Luck
Steve

Posted on Jul 27, 2010

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Hi, Chasity oil leaking from your air cleaner is caused by oil carryover from the engine. For whatever reason, the breather system is not separating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more expensive ones. First, make sure your breather hoses are not dry and cracked if they are ok you can start by trying the following:
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Do you have the rubber tubes going from hollow breather bolts into the intake opening of the induction system??

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1. Run your oil level half way between the add and full mark when hot.
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1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from head into a TEE fitting below carb/induction module then a single line into a mini filter under frame.
3. Purchase Arlen Ness Super Sucker.
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1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from head into a TEE fitting below carb/induction module then a single line into a mini filter under frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump
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Hi Berkberks, oil leaking from your air cleaner is caused by oil carryover from the engine. For what ever reason the breather system is not seperating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more exspensive ones. Start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from head into a TEE fitting below carb/induction module then a single line into a mini filter under frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump
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