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Oil flows out of the air breather filter when starting cold

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  • Harley Davidson Master
  • 39,911 Answers

Hi Anonymous, take a 15 minute ride, let bike idle for 2 minutes and check oil level, drain or add as necessary to achieve full mark hot level. If you are still having problems, go to your local dealer and purchase part number 8873 check ball, 26262-80 spring, and 11105 o-ring. Then remove the the inboard cap on oil pump body with a large flat bade screw driver, use a pencil magnet to remove old spring and check ball, DO NOT USE!!!!! magnet on new ball. Install new parts and your good to go. Good luck and have nice day

Posted on May 08, 2015

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Posted on Jan 02, 2017

onyeredson
  • 404 Answers

SOURCE: oil leaks from breather box

Hi!
From your brief description It sounds like you are experiencing Crank Case pressure build up.
I presume your ZZR is of High mileage or possibly previous owners havn't serviced it regularly.
The problem being the compression Piston Rings wear and allow Blow Back gasses into the crank case there by building up pressure, this in turn sends an oil film up the breather tube to your air box resulting in your problem.
You could try an oil & filter change (Synthetic) Top jolly with maybe an additive plus similar for the fuel i.e. Red-Ex or similar, it may help but I doubt a cure.
If you want you could extend the breather pipe away from the box into a drip can or similar, be sure to filter it as you don't want to get contamination down in the cases.
Hope this sorts it for you?
Please press the Blue Button for appraisal of my FREE! Effort.
Thank You! & Good Luck.
Paul 'W' U.K.

Posted on Mar 05, 2009

  • 53 Answers

SOURCE: oil blowing out of trans breather tube

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

Posted on Mar 26, 2009

raffaiel
  • 209 Answers

SOURCE: oil breather problem

keep your oil breather unblocked all the time's coz the pressure of it can destroy your gasket and oil seal.

Posted on Apr 15, 2009

  • 2 Answers

SOURCE: Gas & oil in air filter box

P.C.V (positive crankcase ventalation) valve is bad.

Posted on Apr 26, 2009

  • 3567 Answers

SOURCE: Fuel from engine breather pipe

There are just three ways for fuel to get into the top end. As mentioned, bad valve guides (exhaust guides are just as old as the intake guides). Bad rings with raw fuel getting past the rings. Either way, fuel is getting up there. Time for a valve job and fresh bore with new pistons and rings. If able to find the parts, I would also install new cam chain and tensioner. You have a very early CB450. Today's VIN numbers have 17 numbers. That is what didn't seem right.
.
Go to the site below where you can see a parts diagram for your specific bike. I already checked and a lot of parts are available for your bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
.
You can also Google 'vintage motorcycle parts honda" and find stuff there.

Top rating for this answer? Thanks!

Posted on Jun 10, 2009

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1 Answer

On a revtech 110 why is oil blowing out the breather tubes and head?


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:
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 under the frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump.
5. Upgrade oil pump and cam plate.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
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Why 1992harley pumps oil when cranking over to star


Check your oil tank level. If it is empty or very low, the oil has seeped by the oil pump check valve and has filled the engine cases with oil. I assume the oil is coming out the air cleaner breather tube? If so, add a quart or so to the oil tank, run the breather hose into a can or bottle, and start it up. Oil will flow out the breather until the cases have been purged. When it stops pumping out refill the oil tank to the proper level. This can happen when the bike has been sitting for a few months or more.

Mar 12, 2015 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

I have a hose with a filter attached to it on the right side of the bike and every time i start the bike oil flows out of it?


check the oil level and make sure its not over full. the hose with the mini filter is a crankcase breather, if there is too much oil, it could cause oil to flow out the breather. It is possible that the rings are worn or broken causing blow by or extra crank case pressure. The hard shifting is usually caused by a dragging clutch or the clutch being out of adjustment.

Mar 14, 2012 | 1989 Yamaha FZR 600

1 Answer

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


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
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Apr 01, 2011 | Harley Davidson FXST Softail Standard...

1 Answer

Engine oil appears to be discharging through the air breather. Came on all of the sudden and seems to foul the breather within a short period of time. Rode about 20 miles and stopped within half an hour...


Check your oil level . If it is too high smell the oil to see if it is fouled with gas. If your carb needle sticks the carb may over flow filling the engine. When the engine is too full the breather blows the oil and gas into the air box. Another way to get gas in the oil is if the fuel petcock malfunctions and pours gas into the intake manifold. If the diaphragm of a vacuum petcock gets a hole in it , the engine may flood with gas. The gas flows into motor and past the rings. If you look under the engine in front of the rear wheel you may see a tube with a plug in it. Place a pan under the tube and pull the plug. It is a pollution tube for emptying the crud out of the bottom of the air box. Some Honda's used to fill there engines with gas randomly. If it happened you just changed the oil & air filter, and kept on driving. It just happened for no logical reason. So check your petcock and carbs for problems, change your oil and air filter, and always turn your petcock off when not riding.

Aug 29, 2010 | kawasaki VN 2000 Classic LT Motorcycles

1 Answer

Oil in air cleaner


Run it minus an air filter until all the oil is off your piston head, you can also try keeping the plug out and ejecting the oil via that access by pulling the cord. It seems like you've already solved the problem, now you're just cleaning up.

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1 Answer

Oil shooting in to the air box


Hello,
From your brief description I'm guessing a high mileage machine? or Previous owners have revved too much from cold?
It sounds like the engine is possibly breathing? the pistons and compression rings are worn so exhaust gasses and compression leaks past them and pressurizes the crank case sending oil out the breather, so the air filter draws it in.
If the bike is performing o.k. and you can live with it try a dribble/breather can? pop the vent pipe into a seperate container to catch it. Make sure you seal the hole in the air filter so contaminents can't get in. also the new breather needs air circulation so trial and error on a recepticle.
Good Luck!
Paul 'W' U.K.

Jan 08, 2009 | 1996 Yamaha FZR 1000

1 Answer

Oil blow out the breather


An overfull oil tank will do it. Even if not overfull just about all harley's will blow oil out the air filter. Unless there is a bunch of oil coming out, it's not a problem What I've found is that the air filter eventually gets saturated and then starts to leak through. The level in the oil tank doesn't seem to matter. If you change the air filter the problem goes away, until the new one gets saturated and then it starts all over again. My plan is to get a K&N air filter, which you can clean yourself and save having to buy a new air filter every 4,000 miles or so.

Nov 20, 2008 | 2006 Harley Davidson XL 1200 R Sporster...

2 Answers

Oil come out the air cleaner


Too much crankcase pressure or the breather pipe is split/dosconnected. The crankcase breather goes into the rear of the air filter and the crankcase gasses are drawn in to the cylinder with the gas/air mixture and burned

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This is a common problem on all sportsters, they have an oil blow by that dumps it into the air filter. I have found that if I run about a half quart low the problem goes away.

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