Question about Harley Davidson FXST Softail Standard Motorcycles

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Oil system manual for a 1987 softail (evolution). oil leaking from breather of engine system.

Posted by kristoferdoi on

  • A Miller Apr 01, 2011

    Harley's leak - it is a law and a requirement.

    On a more serious note, check your PCV valve.

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wd4ity

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On your '87 Softail, the engine breather vent is behind and below the oil pump. The air from the breather is routed into the engine air filter by a metal pipe and rubber tubing that runs from the breather vent to the air filter. It is common to get a bit of oil in the air filter because of this system. The system was designed to meet EPA regulations of the time. Since then, the breather system has been modified to allow the engine to breathe at the top of the heads instead of down low on the engine. This resolves some of the problem with oil getting into the air filter but it still does not eliminate it. The only way to eliminate the oil from getting into the air filter is to reroute the air from the crankcase breather vent to somewhere else. Most people just let it exhaust underneath the bike by putting a small breather filter on the end of a short piece of rubber hose connected to the breather vent.

Good Luck
Steve

Posted on Apr 01, 2011

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2001 Harley Davidson FLSTC - FLSTCI Heritage Classic how to properly check the engine oil


Hi, Linda if you are experiencing excessive oil coming out of the crankcase breather or air filter please drain all engine oil and replace half of the same oil that comes out. Many riders are overfilling their oil system because they do not know how to properly read their oil site glass or dipstick. The following procedure works on nearly all 4 stroke engines but to be on the safe side you should refer to your owners manual. Use your center stand if you have one.
1. Bring the engine up to operating temperature or let idle for 5 minutes.
2. Turn off your engine and let it sit for 2 minutes, this will allow the oil from the top end to drain to the bottom.
3. Hold your bike straight up or on the center stand and wait 2 minutes for the oil in the bottom of the engine to be level in the sight glass or on the dipstick.
4. Your oil level should be between the top full mark and the bottom add oil mark.
5. Never overfill your oil system it will cause problems:
a. oil leaking out of exhaust pipes.
b. oil leaking out of breather pipe/hose.
c. oil carryover into the air cleaner.
6. Your oil site glass must "NEVER" be completely full or empty drain or add oil as necessary.
7. Your oil dipstick must "NEVER" be over the full mark and should never be below the add mark drain or add oil as needed.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at [email protected] Good luck and have a wonderful day.
How to Properly Check Harley Davidson Motorcycle Fluids
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http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
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Instant Repair Help over the Phone to speak to me personally $4

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1 Answer

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Hi Anonymous, 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
5. Upgrade oil pump and cam plate
Good luck

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

Oil leaking from air filter


Hi Anonymous, 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
5. Upgrade oil pump and cam plate
Good luck and have nice day.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

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Hi, Anonymous and the usual suspects are:
1. Oil tank/system overfilled.
2. Faulty breather valve.
3. Engine breather hose bent, pinched, kinked etc.
4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


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1 Answer

Oil leaking from air intake of harley davidson


Hi Anonymous, 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
5. Upgrade oil pump and cam plate
Good luck

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

1989 harley davidson heritage softtail carborator shooting oil


Shooting oil? Your engine is what we refer to as a "head breather". This is because the crankcase pressure is vented into the carburetor, by EPA requirements, through the two large hollow bolts on either side of the breather backing plate. They may be covered by rubber plugs but you can see them when you take the air filter off. Oil accumulation is normal but "shooting" is not. This would indicate a excessive buildup of oil in the rocker boxes and failure of the "umbrella valves" in the center section of the rocker box covers. I'd take the air filter cover off and clean it out thoroughly and see if it still did it. If so, you've got a problem with the crankcase venting system on the engine. Since I'm not that familiar with the Twin Cam engine, I'm reluctant to guess exactly what the problem is. In the older Evolution engines that I'm familiar with, I'd suspect the "breather gear" in the cam chest but I'm not sure the TC-88B engine uses this system. Sorry I can't be more specific.

good luck
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1 Answer

Oil blowing back through breather pipe 1991 heratage softail


Hi Ghaley1, 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
5. Upgrade oil pump and cam plate
Good luck

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

My 04 crf 450 is leaking oil out of the air box breather


Hi, Jmattison21 and the usual suspects are:
1. Oil tank/system overfilled.
2. Faulty breather valve.
3. Engine breather hose bent, pinched, kinked etc.
4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
6. Blow by drain tube cracked/split or filled to capacity.
For more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

1999 Harley Davidson FLSTF Fat Boy oil leaking from the air cleaner


Hi, Tgolovio 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-cracked-pinched if they are ok you can 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 the head into a TEE fitting below carb/induction module then a single line into a mini filter or PVC valve under the frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump.
5. Replace piston rings and follow proper driving seating procedures
6. Upgrade oil pump and cam plate.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the links below and for more specific information or questions at no charge please feel free to contact me at [email protected] Good luck and have a wonderful day.
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1 Answer

Oil leak


Rick, since 1994, Harley has used what we call a "head breather" system in that the crankcase breathers are located in the heads. This was done in an effort to reduce the amount of oil that gets into the air filter. In earlier case breather model engines, the oil would pour into the air filter if the bike had been sitting for a few months. Prior to that, the bike would "puke" what looked like a quart of oil on the ground below the bike when first started after a long period of sitting.

If you'll remove the air filter cover and element, you'll see that the large bolts that hold the breather onto the heads are hollow. Inside the rocker boxes, there are small rubber "umbrellas" that are opened and closed by crankcase pressure. These are designed to allow your engine to breathe without an excess of oil being blown out. Still even though this system is better, a little oil still gets into the air filter. You can either keep this cleaned out or you can replace the "head breather" systems with an aftermarket system that changes the location the system exhaust crankcase pressure from. Also, you can change the "umbrella" seal and put in new ones. It isn't that difficult to do on the front head. The rear head can be tricky since there isn't much room to get to the bolts to take the rocker box cover off. The umbrella seals are located in the center section of the rocker box cover.

Good Luck
Steve

Jun 02, 2010 | 2005 Harley Davidson FLSTC - FLSTCI...

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