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Old 10-21-2012, 05:59 PM   #1
immaculata OP
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Oil everywhere! HELP...

This is never a good ending to a ride...




So i need some help to trouble shoot why the back half of my bike is covered in engine oil. As you can see my beemer is not exactly stock. There's no air box and the crank case breaths via a small K&N filter. Yesterday a mate borrowed the bike and called about 20 minutes later when he stopped and found oil all over the backend. It didn't take me long to find where the oil was coming from, yep, the crank case breather had excreted it. Thank god he stopped when he did because quite a lot of the oil ended up on the back wheel.

Note to self: BUILD A CATCH CAN


But why would this happen? How can i trouble shoot this?

I've pulled the plugs thinking Rings but they look perfect.

Any ideas?
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Old 10-21-2012, 06:03 PM   #2
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Does it smell like gearbox oil? There is a bolt at the top of the gearbox. I've had that loosen (forgotten to tighten it) a few times & the gearbox is good at spitting oil out of that - makes a hell of a mess.
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Old 10-21-2012, 06:38 PM   #3
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Na i don't think so. I had the crank case breather filter under the starter cover and that's where all oil has come out. I can see it's flowed out of that hole on the left side of the case that goes into the starter housing.
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Old 10-21-2012, 07:45 PM   #4
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I know it might sound like a stupid question, but has your mate overfilled it with engine oil?

On my bike, i never fill it up to the max fill line on the dipstick as it will always end up venting into the RH carb.. or in your case the back wheel. I always fill it to about 3/4 up the dipstick marker.. no further.. reading taken with the dipstick unscrewed and resting on the filler hole.
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Old 10-21-2012, 07:54 PM   #5
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not a stupid question at all, i asked him exactly that. But he didn't and it's been fine for the last 2K km's i've done on it so i don't think that's an issue. Thanks though...
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Old 10-21-2012, 08:23 PM   #6
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Did you fill the oil up to the full mark on the dipstick? (or farther?) Also, there's a small drainback hole just under the breather valve in the bottom of the condensing tunnel on the top of the crankcase. If that tiny hole gets blocked the tunnel fills with oil. Pull your breather valve and verify that the drain is open.
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Old 10-21-2012, 09:02 PM   #7
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thanks, i'll check that out tonight
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Old 10-21-2012, 09:04 PM   #8
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I fill my crank full to the full mark and rev my engine to 8k all the time and I never have more than just a little bit come out of my crank vents. I have still never noticed any airhead engine stop using oil or stop blowing a small bit out the crank vent at the half way mark or even at the add mark. I am keeping my eyes open since tons report just that.
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Old 10-21-2012, 11:04 PM   #9
Voltaire
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snap....


we pulled the gearbox out and the flywheel off.....not the main seal...

eventually found the culprit....



had a sort of bodged silicon gasket....

Interesting comment earlier about oil level....

What I think happened was at high revs ( its a race bike) the breather tube to catch bottle filled up and dripped out via the 'gasket' into the clutch......grrrr.
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Old 10-22-2012, 01:41 AM   #10
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Quote:
Originally Posted by Airhead Wrangler View Post
Did you fill the oil up to the full mark on the dipstick? (or farther?) Also, there's a small drainback hole just under the breather valve in the bottom of the condensing tunnel on the top of the crankcase. If that tiny hole gets blocked the tunnel fills with oil. Pull your breather valve and verify that the drain is open.
is this the hole you mean? No idea how i confirm this is not blocked. Looks ok i guess? (not a bad photo for a phone!)

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Old 10-22-2012, 02:03 AM   #11
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What I think happened was at high revs ( its a race bike) the breather tube to catch bottle filled up and dripped out via the 'gasket' into the clutch......grrrr.
Got a feeling my clutch has copped some oil too. I wasn't riding but my mate that was said it felt like the clutch was slipping.... great!
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Old 10-22-2012, 03:01 AM   #12
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Originally Posted by immaculata View Post
is this the hole you mean? No idea how i confirm this is not blocked. Looks ok i guess? (not a bad photo for a phone!)

found this shot on bmwmotorcycletech. time to start poking...


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Old 10-22-2012, 03:24 AM   #13
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I've seen the oil spew out of the breather once ( not on my bike) but only when the rings were shot and pressurising the crankcase.
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Old 10-22-2012, 04:45 AM   #14
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I've seen the oil spew out of the breather once ( not on my bike) but only when the rings were shot and pressurising the crankcase.
That's exactly what I hope it's not. I guess a compression test will tell all?
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Old 10-22-2012, 05:44 AM   #15
pommie john
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Originally Posted by immaculata View Post
That's exactly what I hope it's not. I guess a compression test will tell all?
I guess, but a leak down test would be better.
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