Oil out of crankcase breather - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 04-27-2013, 01:17 PM Thread Starter
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Oil out of crankcase breather

Hey all,

I had a slight problem with this last year but now that I've been taking the bike out for the Spring I've noticed that after I park it, a few drips of oil will accumulate overnight on the concrete. I've ear shaved and currently don't have the breather hooked up to a filter - when I did the filter would slowly (over the course of weeks) fill up with oil or whatever and it rendered the breather ineffective. It's a very, very slow drip and I don't know where to start looking. I've reviewed some previous posts on the matter but they've mostly consisted of real fuel leaks and this isn't that. I'm pretty sure it's oil that's coming out but will take pictures if it helps in identifying the problem.

On another note - Is anyone up for some riding around the NYC metro area this summer? I'm living out in eastern Long Island for the summer. Wolfie ... if you're still around, we should definitely meet up for a ride. It's been a cold winter and I've neglected the forums but would love to get involved in some rides.
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post #2 of 7 (permalink) Old 04-27-2013, 03:45 PM
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How high above your crankcase is the end of your vent tube? Pressure inside the crankcase (as the pistons and rods spin whipping things up) can push the oil up a little inside the tube. If the end of the tube isn't at least 4" or 6" above the crankcase you could get a little oil pushed up and out of the end under normal crankcase pressures.

On a seperate but related note if your engine (rings) is letting excessive pressure past the piston rings (blowby) this additional pressure can also push the oil "spray" inside the crankcase even higher making the oil seep even higher in your vent tube. A bit of blowby is a fact of life on any piston engine but with worn rings blowby will increase further increasing crankcase pressure. The more pressure, the further up a bit of oil can creep up the vent tube.

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Last edited by Spencer1; 04-30-2013 at 07:52 AM. Reason: corrected information
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post #3 of 7 (permalink) Old 04-28-2013, 04:53 PM
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Originally Posted by vulcanpower View Post
Hey all,

I had a slight problem with this last year but now that I've been taking the bike out for the Spring I've noticed that after I park it, a few drips of oil will accumulate overnight on the concrete. I've ear shaved and currently don't have the breather hooked up to a filter - when I did the filter would slowly (over the course of weeks) fill up with oil or whatever and it rendered the breather ineffective. It's a very, very slow drip and I don't know where to start looking. I've reviewed some previous posts on the matter but they've mostly consisted of real fuel leaks and this isn't that. I'm pretty sure it's oil that's coming out but will take pictures if it helps in identifying the problem.

On another note - Is anyone up for some riding around the NYC metro area this summer? I'm living out in eastern Long Island for the summer. Wolfie ... if you're still around, we should definitely meet up for a ride. It's been a cold winter and I've neglected the forums but would love to get involved in some rides.
As soon as Wolfie gets his bike back up and running, we should be doing a few rides. Check out the northeast section of the forum and look for QSRG (Quad State Riders Group) posting for upcoming rides.
We do a lot of informal meet ups and just ride for fun on weekends.
I am 20 miles west of NYC, so if you are in the area, let me know and I'll be glad to meet up with you...maybe even take you up to go visit Merc and Wolfie for a ride.
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post #4 of 7 (permalink) Old 05-06-2013, 09:26 PM Thread Starter
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Originally Posted by FoolAmI View Post
How high above your crankcase is the end of your vent tube? Pressure inside the crankcase (as the pistons and rods spin whipping things up) can push the oil up a little inside the tube. If the end of the tube isn't at least 4" or 6" above the crankcase you could get a little oil pushed up and out of the end under normal crankcase pressures.

On a seperate but related note if your engine (rings) is letting excessive pressure past the piston rings (blowby) this additional pressure can also push the oil "spray" inside the crankcase even higher making the oil seep even higher in your vent tube. A bit of blowby is a fact of life on any piston engine but with worn rings blowby will increase further increasing crankcase pressure. The more pressure, the further up a bit of oil can creep up the vent tube.
Yeah, the vent tube was fastened to the place my left ear originally screwed into, using an EMGO filter. I guess the engine is getting a little old and this is normal but it worried me a little bit.

kc2dg- Back in late May/early June. Definitely interested in some rides.
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post #5 of 7 (permalink) Old 05-06-2013, 10:03 PM
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Originally Posted by vulcanpower View Post
Hey all,

I had a slight problem with this last year but now that I've been taking the bike out for the Spring I've noticed that after I park it, a few drips of oil will accumulate overnight on the concrete. I've ear shaved and currently don't have the breather hooked up to a filter - when I did the filter would slowly (over the course of weeks) fill up with oil or whatever and it rendered the breather ineffective. It's a very, very slow drip and I don't know where to start looking. I've reviewed some previous posts on the matter but they've mostly consisted of real fuel leaks and this isn't that. I'm pretty sure it's oil that's coming out but will take pictures if it helps in identifying the problem.

On another note - Is anyone up for some riding around the NYC metro area this summer? I'm living out in eastern Long Island for the summer. Wolfie ... if you're still around, we should definitely meet up for a ride. It's been a cold winter and I've neglected the forums but would love to get involved in some rides.
on my vulcan 800 i have a crank case breather tube, i put that into a T which ties to a filter to get 'air' which is higher then the engine, and the other end goes into a medicine bottle looking thing to collect oil etc... What collects is something that represents oil mixed with water (so like condensation in engine i am thinking) I collect it in the medicine jug so that it does not drip on the ground... came stock with that so i kept it.

You should do the same thing, if you have only the filter, eventually it iwll load up with oil and you will get oil blown all over your clothes, been there, done that.

You have to have a place for the collected liquid to go.

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post #6 of 7 (permalink) Old 05-06-2013, 11:06 PM
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Good idea, you definitely wouldn't want to get oil on the rear tire some way. Not fun.

Somewhere I saw a spec drawing of an earlier VN750 engine that showed a tube coming out and pointing down at the road. A draft tube like the old cars used to have before PCV valves. Not the hot setup... mulch a piston and ride through your own oil.

That water is from condensation, engines sweat in the right conditions. That's one main reason short trips are hard on engines. They get warm enough to sweat with temperature changes, but not hot enough to boil off condensation in the oil, hence the milk shake on the oil cap and inside valve covers.
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post #7 of 7 (permalink) Old 05-16-2013, 08:08 PM Thread Starter
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Mercury, that sounds like a great idea. Can you post a photo for me to reference? I've got the breather wide open right now and I'm afraid I'm going to accumulate all kinds of **** in there if I don't get it taken care of.
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