Author Topic: Airbox draining oil after ride....normal? (Read 1582 times)

gregripko · « **on:** March 06, 2013, 12:57:21 PM »

On the bottom of the airbox there's a outlet next to where the breather tube connects... The air is reburned but I'm noticing some oil spots on the ground and the drain is dripping a bit... I don't have the small hose piece that connects to the bottom (the little tube with a needle sized hole...think it's called a breather tube).... Is that a vital part for reburning vapor in air box? Randomly guessing that the rubber tubing would produce higher suction and decreased dripping.... If so... Anyone know a solution how I can make one or get my hands on one?

phil71 · « **Reply #1 on:** March 06, 2013, 03:39:41 PM »

it usually indicates blow by, OR if the relief valve is stuck it can push oil out of the top of the engine. You don't say which bike. that's important.

gregripko · « **Reply #2 on:** March 06, 2013, 03:40:32 PM »

Cb550K 76

goldarrow · « **Reply #3 on:** March 06, 2013, 03:47:36 PM »

Like Phil said, small dripping is normall, from blowby.

gregripko · « **Reply #4 on:** March 06, 2013, 03:57:11 PM »

its enough to spot the ground after I ride....like maybe a small cap (without drain tube at the bottom of the airbox)

gregripko · « **Reply #5 on:** March 06, 2013, 04:03:51 PM »

going to make a drain tube for the bottom of the airbox.......anyone know the size by chance?

Looking to make this tube:

phil71 · « **Reply #6 on:** March 06, 2013, 04:29:46 PM »

re-routing the oil doesn't explain what's wrong. if you're seeing that much, something's going on there. Take a look at this diagram. If the relief valve is malfunctioning there will be an excess of pressure in the top of the head, and it'll push oil out of the breather tube. I'd also expect to see a lot of seepage around the cam cover.
getting a read of your oil pressure would be good too.
If it's blow by, it sounds like a LOT of blowby, and you may have a tired engine there.

SohRon · « **Reply #7 on:** March 06, 2013, 04:43:05 PM »

The hose is still available from BikeBandit and is cheap, so you might as well get the real thing! it should be plugged at the tip - either the special little cap, or anything you can find to plug it with; it definitely would not be dripping oil if it's properly plugged.

If your airbox is complete, that is, if it contains all of the catch-cans and filters, then having some oil to drain is normal in that the purpose of the filters is to remove oil and water contamination from the blow-by before it's sent back through the intake. Its part of the normal maintenance procedure to drain the hose.

If this hose is left open, and your airbox isn't set up properly then you're likely developing a high pressure condition in the crankcase, which will cause oil to be forced out of the nearest available opening (the drain tube).

gregripko · « **Reply #8 on:** March 06, 2013, 04:58:39 PM »

How would I know if a relief value is malfunctioning?

phil71 · « **Reply #9 on:** March 06, 2013, 07:51:05 PM »

run the bike with the hose off and see how much comes out. Also, put your hand over the oil filler (dipstick) hole. If there's a lot of air pressure there, you might have a stuck relief valve.
What's the mileage? What oil weight are you using, and when was your last oil change?

SohRon · « **Reply #10 on:** March 06, 2013, 07:52:44 PM »

Quote from: gregripko on March 06, 2013, 04:58:39 PM

How would I know if a relief value is malfunctioning?

I'd say get your airbox properly routed and set-up before you move into more obscure solutions.

phil71 · « **Reply #11 on:** March 06, 2013, 07:58:59 PM »

Oh, yeah, SohRon is dead on there.. sorry, I should have said that.

gregripko · « **Reply #12 on:** March 06, 2013, 08:05:30 PM »

made a drain tube and going to test it tomorrow.....fingers crossed

SohRon · « **Reply #13 on:** March 06, 2013, 08:16:57 PM »

Quote from: gregripko on March 06, 2013, 08:05:30 PM

made a drain tube and going to test it tomorrow.....fingers crossed

I'm curious as to how you're "testing" the new drain tube. What did you use to plug it with?

gregripko · « **Reply #14 on:** March 06, 2013, 10:09:43 PM »

I actually cut the nipple off a baby bottle and epoxied it to the end of a tube

gregripko · « **Reply #15 on:** March 06, 2013, 10:11:36 PM »

31,000 miles using castrol motorcycle 10w-40 regular

Deltarider · « **Reply #16 on:** March 07, 2013, 12:31:24 AM »

You didn't overfill, did you? Try having the oil halfway the dipstick and report back please.

gregripko · « **Reply #17 on:** March 07, 2013, 08:49:45 AM »

dipstick was showing half way between two points but ill recheck again with it settled.... Notice with this bike that it is very sensitive about oil amount.... Too much and shifting into neutral from first is extremely difficult ..... Just right and it shifts with ease....

gregripko · « **Reply #18 on:** March 07, 2013, 10:58:19 AM »

This may be completely unrelated but after I changed the oil filter I realized that there wasn't a spring present in the filter housing (spring that pushes the filter to the base)

lucky · « **Reply #19 on:** March 08, 2013, 07:39:15 AM »

Better get that spring.

gregripko · « **Reply #20 on:** March 08, 2013, 08:31:57 AM »

.....already ordered

that might be it as the oil is basically scooting around the filter....

phil71 · « **Reply #21 on:** March 08, 2013, 08:45:15 AM »

I can't wait for spring.

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Author Topic: Airbox draining oil after ride....normal? (Read 1582 times)