Question about Harley Davidson FLSTC - FLSTCI Heritage Classic Motorcycles

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Just seems like on moderate to heavy acceleration it mist all over the oil tank and sometimes even drips on the cam cover. it is definitely more of gas than it is oil, engine has approximately 3800 miles on it since freshening up. it is a 95 inch tc b engine with se htcc ported heads and pistons with 650 lift cams in it. it has se 2 into 1 exh. with a 48mm mikuni carb and rivera manifold with se breather with arlin ness big ****** backing plate with internal crankcase breather holes.

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Thinc u better inspect tank n fuel flow before u turn it into a space shuttle--u hav quite an impressive scoot--Im mostly an olschooler wen hd's had low hp--ther is much literature from newshoolers online or in stores

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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Front axle vent tube leaks out oil


You are likely to get an oil 'mist' from a vent or breather tube -this is quite normal. The 'mist' cools around the breather and forms a small oily patch. on the axle casing.

Are you certain that the oil is coming from the vent tube and isn't due to a split in the metal casing or from the gasket/seal?

How much oil are you losing? The only other way you would lose oil is if excess pressure was building up inside the differential and to be honest, it's difficult to see how this would occur unless it has recently been over-filled with oil.

If there are drips of oil appearing on the ground underneath the axle/differential chances are that it's the cover seal or the pinion seal at fault. The pinion seal is where the driveshaft/propshaft attaches to the differential. The cover seal is the gasket between the metal cover where the filler plug is and the differential casing itself.

Apr 23, 2016 | 1997 Dodge Dakota

1 Answer

Oil leaking from back of air filter


Hi Robert, 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

Jul 19, 2012 | 2002 Harley Davidson FLHR - FLHRCI Road...

1 Answer

316.794711 4 cycle blower dies/loses power


My assessment is you have bad piston rings and a large amount of blow-by.Hence the misting you mentioned. I am also going to assume you need to top off the oil frequently. Another sign of bad rings or even a cracked piston. Check your compression if you have a gauge as it should be around 30 to 50 PSI. If not then you need a rebuild. You should be able to get a replacement piston and ring set as well as the associated gaskets at Sears or many on line sources. If you are not equipped to break the engine down, a trip to the big box store with credit card in hand is my last recommendation.

Jul 04, 2017 | Craftsman Garden

1 Answer

86 harley oil leaks out carb when you start it


Your crankcase vents into the carb air filter. This was required by the EPA. All crankcase vented pressure has to be cycled through the engine. So, If you'll look behind your air filter to the rear of the bike, you should see a pipe coming from just behind the oil pump up to the backside of the air filter. The air pressure exhausted from the crankcase has an oil mist in it. There are baffles in the pipe but sometimes during servicing, these baffles get left out. Still, even with the baffles, there is some oil mist that makes it's way to the air filter. This oil builds up over time and causes a drip out of the air filter. Regular cleaning of the air filter assembly reduces this.

If you're getting more than the usual amount of oil, your engine could be "oil sumping". This is where the oil in the oil tank seeps past the check ball valve in the oil pump and builds up in the bottom end of the engine. When you start the engine, the oil pump cannot pump it back to the tank fast enough and it's blown out the crankcase vent tube right into your air filter. You can "reseat" the check ball and may be able to get it to stop doing this.

Or, you could remove the crankcase vent tube going up to the air filter. Put a piece of tubing about six inches long on the nipple coming out of the engine case and plug the hole in the backside of the air filter backing plate. Then, the oil will directed onto the ground instead of into your air filter.

Good Luck
Steve

Aug 19, 2011 | Harley Davidson FXR Super Glide...

1 Answer

Oil blow-by in air filter on 2001 twin cam 88


Regrettably, this is a common problem. The EPA requires that air vented from the crankcase be circulated through the engine to be burned. Since a Harley engine is a V-Twin engine with a single crankpin, the crankcase pressure is quite high with both of those pistons going downward at the same time. That is why Harley moved the crankcase vents to the heads in 1993. This helps but there is still some oil mist in the vented air and it will accumulate over time. This requires that you periodically clean the air filter cover out to keep most of the oil build up from dripping out. If the oil blowby is too bad, you may need to consider having a leak down test run on the engine to check the condition of the rings. Also, there are some "umbrella seals" in the rocker box covers that may need to be replaced.

Good Luck
Steve

Jul 22, 2011 | 2001 Harley Davidson FXDWG Dyna Wide Glide

1 Answer

Oil blow-by out of breather/air filter at high speeds (80 mph and up)


The EPA requires that all crankcase vented air pressure be run through the engine to be burned. In order to comply with this, the crankcase vented air is vented through a hole in each head and is carried to the air filter by large hollow bolts called "union bolts". There is one on either side of the air filter element. Since the vented air has an oil mist in it, this mist will eventually build up in the air cleaner and drip out or be blown out by the wind. You should clean this buildup out of the air filter assembly regularily. If the build up is excessive, it could be due to excessive crankcase pressure due to wear in the rings or it could be caused by the umbrella seals in the center rocker box cover not sealing well. Replacing the umbrella seals is simply but it requires the removal of the rocker box covers. To get the covers off, you'll have to remove the fuel tank.

Good Luck
Steve

Jul 03, 2011 | 2001 Harley Davidson FLHTCUI Electra Glide...

1 Answer

1988fxstc. Oil is blowing out of what looks like a oil tank vent hose that ends down by the rear tire. This is not the drain hose, but looks like a venting hose that is open near the rear tire. Anyone...


Without seeing the bike, I would guess that this is the crankcase vent. Originally, the crankcase vent tube came up from behind the oil pump and went to the backside of the air filter. A lot of owners changed the routing of this hose due to oil being blown into the air filter. They simply remove the metal part of the tube and replaced it with a short open ended hose running back and ending just forward of the rear tire.

As for the oil blowing out of the tube, it depends on how much oil blows out of the tube. If it's just a mist that will sometimes coalese into a droplet, this is about normal. But, if it's a steady drip or flowing oil, this is not right.

If the mist is heavy, this could be caused by excessive blowby on the rings creating high crankcase pressures. The use of synthetic oil should not increase the blowby unless the rings are in poor shape, then it will. The use of synthetic oil seems to aggrevate any minor leak turning it into a much larger leak.

If the oil is coming out in a steady stream or pumping the oil out of the engine, you proabably have sheared a key in the scavenge gears of the oil pump and it's not pumping the oil back into the oil tank.

Now there is a vent hose on the oil tank but it should be routed to a fitting on the crankcase that is located just above and slightly behind the top of the oil pump.

Good Luck
Steve

Oct 17, 2010 | Harley Davidson FXST Softail Standard...

1 Answer

Oil leak looks like it is from oil pan drips onto the exsaust can not tell for sure.


Arh, you are most likely suffering from Camshaft cover oil seal problems. It is very common and causes the oil to drip on to the exhaust giving fumes and sometimes smoke if you've been thrashing it?

To solve the problem :

Remove camshaft covers both sides. Take out the little oil seals that the cover securing studs go through. They are about 1/2" across and pop into the holes that the stud and nut secure the cam cover on. You will notice the old ones to be hard and mostly cracked. Replace the cam cover gasget both sides as well. This should solve your issue. Remember not to tighten the cam cover nuts up too tight otherwise you will squash the new seals between the cover and metal seal cup they sit in. This will cause them to leak again if you do that. Check out the net for correct torque settings for the Camcover retaining nuts.You can buy the cam cover oil seals and gaskets easy on line.

Hope this helps

Oct 13, 2010 | 1995 Subaru Impreza

1 Answer

'02 impala ls 3.8L. lose all acceleration, at heavy acceleration and/or 4000rpms. then sputters and chugs.


I had the same on my 3.8L 2002 Impala. Right arround 3500-4000rpms with moderate to high acceleration; shaking and bucking. With light acceleration, it seemed OK. And no "check engine" light.
It was the MAF sensor. I ended up replacing it, but it was pretty expensive $150+?
You might try cleaning yours first with MAF spray cleaner.

It is located on the throttle body under the engine cover.
Here is picture of it: http://i2.photobucket.com/albums/y48/ZeeVert/2002%20Impala/ac%20condensor/MAFsensorcopy.jpg
I was working on the a/c so some other parts were removed.

Apr 01, 2010 | 2002 Chevrolet Impala

1 Answer

1994 LT1 Engine "balks" under acceleration intermittently


Your fuel pump or your catalytic is plugged. have it tested with a infrared gun it will tell you if the cat is bad and if it is replace it test the fuel pump for fuel rail pressure it should read 50 psi then hold to 20 psi for 1 minute.. Also check to see if the intake plate is dirty and if it is do a top engine clean, buy GM's top engine cleaner and run it threw the engine, if you have carbon buildup the compression and cause the car to run bad and the knock sensor will not be able to adjust time. I know this sounds silly but these three things will cause your problem and so will a bad fuel filter.

Jul 22, 2009 | 1994 Chevrolet Corvette

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