lower crankcase vent puuking oil

[jscheetz]

I replace the S&S teardrop air cleaner with a velocity stack, and the mechanic working on the bike at the time cable tied the lower crankcase vent hose to the oil line and it was open under the oil tank.

After the bike sits for a while, it will puuk about a 1/2 cup of oil out of this hose and then stop. When I questioned the mechanic he said it was normal???? I was just too stupid at the time.

I routed the hose to a small breather collector mounted down by the tranny, but it will fill this collector up!

I am running dougherty power vents on the upper breather.

I never had blowby when the vent was connected to the back of the air cleaner.

What could be causing this?

 

[PROFLYER]

are you still running the factory black/white check valve? Is it going the right way? Not sure what a power vent is, but my rear head breathes into a similar setup and I've never seen more than some light oil residue after long idle periods (fing sturgis!)

 

[jscheetz]

Yes, it is an 02, 107. I did not disassemble the bike for this, and have not seen a check valve........Where would the original check valve be installed? After the mod, all I had was a braided hose cable tied to an oil line.

When the hose was longer and higher, do you think that the hydraulic pressure was not strong enough to push the oil out? Not sure if I said that right......

 

[PROFLYER]

Disregard my post, I'm stuck in 117 land....

 

[LamboV12]

Run a overflow hose - check out Mudslinger's post:
http://www.bigdogbiker.com/forums/how/1411-accutronix-s-s-velocity-stack-bracket-install.html

 

[jscheetz]

Thanks for that!

I actually searched the forum and reviewed his post before I posted this. As I said, my hose was just left open under the oil tank, and it was sending oil all over my tranny and starter. With mudslingers set up, I would have that filter saturated. My fix has been a breather/collector mounted between the tranny and motor (similar to the other photo in the post). I would say the collector holds about 4 oz., and so much oil is coming out that it is coming out of the top at the breather filter and all over my garage floor. It is a serious amount of oil, not just a mist. What is wierd is that it will stop, and not happen again until the bike has sat.

As I am writing this, I am thinking....I know it is dangerous......would a restriction of the breather at the head cause this oil puuking?

I will take the Dougherty power vents off the bike, start it and see if I get any oil puuk!! I will be back........

 

[Raywood]

Just a thought but have you checked the level of oil in your tank. Is it too FULL. If so oil could be going back down the vent tube inside the tank and draining back into the case and being sucked out.

Just something to check.



Here is a pic from the S&S manual showing the inside of your oil tank. You can see the three lines on the tank. A is your return from the oil filter, B is the vent from the motor and C is our feed line to the oil pump. If you over fill the tank you could have oil returning to the motor through the vent line.

This the puke can you taking about? I had one on my 03

 

[Vegas]

To me it sounds like it is as simple as taking a breather hose that oil has to climb a foot North vs an open breather hose heading West or South. Since your probelm started after installing the powerpac I would mount the filter as high as possible or just run yourhose back up top and use a fitting. Using a breather canister will cause you to have to drain it regularly. If you look at Rays photo the breather hose clearly is higher than the engine opening and would rarely purge into the oil bag. If it did so what you are just returing it to the oil bag.

 

[jscheetz]

Thanks for the comments, and yes Ray, that is the "puuk can" I have mounted between the tranny and the motor. I checked my oil tank, and beleive that the vent is ok....not running back into the crankcase.

I have thought about mounting the filter higher, but I am more inclined to think that Sul is right and that it is a check ball problem in the oil pump. From what I have learned, this ball can sometimes not seat properly and allow oil to drain back into the sump, which is them pumped out the breather on start up. Once running the check ball is operational, and the puuk stops. That is exactly what is happening to me, it will stop after a minute or so, and not happen again for the entire day.....only after it has sat for a while.

I have also read about people cleaning this check ball. Procedure anyone?

Can it be done on the bike? If I open the check ball screw, will the spring and ball wash out with oil from the tank? (similar to the priming process) Is that enough to "clean"?

Thanks again for all your help!!!

 

[jscheetz]

Thanks Sul,

I will give that a shot and get back. Leaving town so I won't get to do this until next week

 

[pisssed]

havent found the tech sheet but the procedure is to purchase 2 new check balls. remove the stock one with a magnet. insert a new one and using a punch, (best thing is a push rod cause of the recessed end) lightly tap the rod to re-seat the mate point for the check ball. remove that ball and discard. install the fresh one.

thats the idea.
i'll see what i can find

This may be of some help also Oil Pump Check Valve Repair

 

[pisssed]

sweet find pissed!


here's another.


Halting The Oil Flow

Now thats a SWEET FIND!!!!

 

[chacha]

Good stuff. I like the idea of fixing a problem on the bike with another bike part!

 

[Bulldog03]

Good info, will have to watch for this problem on my ride,now there's a fix for it, hope I won't need it!