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Harley is leaking oil from head breathers 1340 evo what could this be

Posted by Anonymous on

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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 and have nice day.

Posted on Jun 27, 2015

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Posted on Jan 02, 2017

wd4ity
  • 4565 Answers

SOURCE: I have a 96' evo,recently i had new head gaskets

In 1993, Harley went to the "head breathing" crankcase breathing system. The crankcase pressure is vented into the air cleaner to be routed though the engine and burned. This was a requirement mandated by the EPA. Prior to '93, the crank case vent was down behind the oil pump and a pipe directed the crankcase pressure up to the air cleaner. If you have the "head breather" heads, you'll have a large hollow bolt going to each head from the air cleaner assembly. If whoever did the top end job on your engine left the umbrella valves out, installed them upside down, or put the center plates in wrong, it could be causing your problem. If they replaced the head gasket and did not replace the base gaskets, the base gasket are going to leak. Whenever you take the torque off the head bolts, you must replace all gaskets. Additionally, if the cylinder studs on your engine have not been replaced, they are probably stretched and not holding the torque like they should. In 1996, Harley came out with an improved replacement stud for the Evo engine. The large diameter part of the stud is at the lower end of the stud rather than at the top end like the older model was. If you can't get those, Colony Fasteners makes an excellent set of studs that cost about the same as H-D parts. Blue or black smoke out of the exhaust usually indicates a rich fuel mixture.

Good Luck
Steve

Posted on Jun 27, 2011

Testimonial: "thanks steve,that solves the problem of umbrella valves or not,your advise is sound and as a none harley mech did the heads mistakes can be made.thank"

Mitchy123
  • 216 Answers

SOURCE: were do you drain the oil on a 1340 evo motor

Evo's drain from the oil tank, not the engine

Posted on Jun 16, 2009

DJ_MAX1369
  • 119 Answers

SOURCE: i need a wiring diagram for a harley 1340 evo EFI.

Best bet would be to get a factory service manual it will be the best 60 USD you ever spent

Posted on Nov 06, 2009

wd4ity
  • 4565 Answers

SOURCE: 89 Harley FLTCU oil coming from the crankcase breather tube and

This is an age old problem for the Harley engine. In you 89 model, the crankcase breaths from behind the oil pump through a tube that runs to the backside of the air filter assembly. Most people that I know, simply remove the tube coming up to the air filter and block the hole in the air filter assembly backing plate. At the breather, they run a short hose to just behind the transmission and cut it off there. This is similar to the earlier Shovelhead engine and the way it breathes. In 1994, Harley went to the "head breather system" which was better but it still gets oil into the air filter assembly.

There is one thing I saw on the aftermarket assessories market once called a "CatchCan". The breather tube ran to it and it seperated the oil from the air and the held it in a small container to be emptied on a regular basis. I have never used one nor have I ever seen one so all I can tell you is what the book said. Matter of fact, I cannot remember where I saw it now. Custom Chorme catalog, maybe. Good Luck, Steve

Posted on Apr 30, 2010

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I have a 96' evo,recently i had new head gaskets


In 1993, Harley went to the "head breathing" crankcase breathing system. The crankcase pressure is vented into the air cleaner to be routed though the engine and burned. This was a requirement mandated by the EPA. Prior to '93, the crank case vent was down behind the oil pump and a pipe directed the crankcase pressure up to the air cleaner. If you have the "head breather" heads, you'll have a large hollow bolt going to each head from the air cleaner assembly. If whoever did the top end job on your engine left the umbrella valves out, installed them upside down, or put the center plates in wrong, it could be causing your problem. If they replaced the head gasket and did not replace the base gaskets, the base gasket are going to leak. Whenever you take the torque off the head bolts, you must replace all gaskets. Additionally, if the cylinder studs on your engine have not been replaced, they are probably stretched and not holding the torque like they should. In 1996, Harley came out with an improved replacement stud for the Evo engine. The large diameter part of the stud is at the lower end of the stud rather than at the top end like the older model was. If you can't get those, Colony Fasteners makes an excellent set of studs that cost about the same as H-D parts. Blue or black smoke out of the exhaust usually indicates a rich fuel mixture.

Good Luck
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Where does the oil go from tank when bike sits a long time?


This is what we call "oil sumping" around here. On the soft tail line or any other line of Harley where the oil tank is higher than the oil pump, the oil will seep past the check ball in the oil pump and leak into the crankcase of the engine. When the engine is started up, it will "puke" the oil out. Now, up until the introduction of the Evo engine, the engine would puke on the ground under the bike out the breather tube. Now with the Evo engine and the EPA's regulation that crankcase ventilation fumes have to be fed back through the intake, it pukes into the breather. An even bigger mess. So, what we do whenever we think we've got this situation is put a pan under the shovelhead and panhead bikes, On the Evos and Twin Cams, we take the air breater cover and the air filter out before the fire the engine. It's a mess either way you look at it. I don't think the Twin Cams are as bad as the Evo engines due to the different type of oil pump.

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Oil blowing out through air-filter,rough running,engine light comes on,tries to cut off.stop then shut down for a few min. then usually runs ok till next ride.was told to clean "breather tubes,air filter...


Your '98 Evo motor is what they call a "head breater" engine. This means that the crankcase ventilation is at the upper end of the heads rather than way down at the lower end of the engine like it used to be. They the first year for the "head breaters" was 1994.

Now, At the top of the heads where the rocker boxes are, there are three pieces. The lower rocker plate with the rocker arms in it, the middle piece and the upper cover. If you take the four bolts out, you'll see an umbrella valve in the middle piece of the rocker boxes. This valve is a replacable rubber piece. Over time and many times of heating up and cooling down, they can get brittle and allow a lot of blowby resulting in oil in your air filter element.

Now there is another part in the cam chest that has a lot of effect on the operation of the crankcase breather system on your bike. This part is called the "breather gear" and is located down in the cam chest to the rear of the camshaft. In you bike, the part is made of plastic if it's the original part. I have seen the teeth break off of the drive gear and the breather gear stop turning. This will screw up the "breathing cycle" on your engine and cause it to "blow oil". Usually, the oil pump locks up when this happens due to the plastic teeth getting in the oil pump but not always. If this eventually turns out to be your problem, have the mechanic or yourself install one of the new S&S reed valve type breather gear replacements. They don't turn at all and work absolutely great. The part is about a hundred dollars but it's well worth it. Solves the old broken breather gear problem that has plauged the Evo engine it's entire life.

There are no "screens" in the Evo engine other than the "tappet oil screen". Just in front of the oil pump is a screw plug that is in the engine cases itself. If you remove this plug, there is a small spring and cone shaped screen that filters the oil prior to it going to your tappets. This should be cleaned every other oil change but it has nothing to do with the oil in your breather.

Now some riders will tell you that if you allow your Harley to sit for any length of time that it will "oil sump" with you. By this, they mean that oil will seep past the check ball in your oil pump and pool up in your crankcase. When you start the engine up, oil will be blown into your oil filter. Not true on your Ultra. The bikes that will oil sump are the Sportsters, Softails, Shovelheads, or any bike that the oil tank is higher than the oil pump on the frame. On your Ultra, the oil tank is on the bottom of the transmission. Your bike will not "oil sump" unless you have a sheared key in your oil pump or the oil has somehow learned how climb. You oil tank is below your pump in other words and oil does not flow uphill.

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1 Answer

Oil change on my harley


No - evo motors drain from the oil tank - Look for a drain plug in the hose under the tank

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Were do you drain the oil on a 1340 evo motor


Evo's drain from the oil tank, not the engine

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