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Old 03-08-2016, 09:51 PM   #1
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odd Cummins oil-leak

so right now, the leak I have had for a few weeks, appears NOT to be coming from the front main sea as I feared, but appears to be dripping directly out of this hose, which I have been unable to determine, WHAT it is, or how to fix the leak. Any help with direction or where to look would be appreciated

A good picture of similar engine (not mine)

note arrow at bottom-right



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Old 03-08-2016, 10:09 PM   #2
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Is the bottom of the hose open or connected? Looks like a blow by hose.
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Old 03-08-2016, 11:04 PM   #3
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The hose is open, pointed to the ground. If it is a blowby, it is blowing a quart every 200 miles
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Old 03-08-2016, 11:24 PM   #4
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Sure shouldn't be that much, that disc where the hose is connected at the top, does it come off? Is there a filter inside..I would think there is, like one of those kitchen sink scrubber things, if that is real dirty it could cause pressure to build up..but the underlying cause would be why so much oil is getting to that area.
Where does that other pipe connect to?
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Old 03-08-2016, 11:32 PM   #5
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That my friend is your cranckcase ventilation hose and if you are for sure loosing that much oil all from that hose then Im terribly afraid that your engine is in poor condition (bad rings or valve stem seals) or your oil level is too high. If it is your oil level being too high then why is it that way? Did someone overfill it at service or is fuel getting into the lube oil. Fuel can get past a bad injectionpump driveshaft seal on some engines but not sure about the 5.9.
Maybe someone else more familiar with the inner workings of this one will chime in here.
I do hope for your sake its something simpler but from here it does not look good.
Another thought is the possibility of a plugged drainback hole/passage under the front cover there, but I believe that's pretty wide-open back down to the sump in that area.
Cheers and best of luck with that.
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Old 03-09-2016, 12:43 AM   #6
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I should elaborate on my comment about your engine possibly being in bad condition. What I meant was that if it realy is pushing as much oil as you say out that vent tube, it's likely compression pressure blowing past worn or broken rings or exhaust pressure blowing past the valve stems. Either one will cause excess crankcase pressure and push oil out the vent.
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Old 03-09-2016, 08:53 AM   #7
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That is the crankcase vent. The rubber hose can come off and that circular thing should unscrew counter clockwise with a filter wrench. That circular thing will have stainless steel mesh inside in order to catch and condense any oil vapor out of the blow by. Are you catching a quart every 200 miles or are you noticing that it's a quart low every 200 miles? Have you ever done an oil analysis? Sometimes those will show that you have excess fuel and/or hydrocarbons in the oil indicating excessive blow by caused by worn rings. With the engine running, how much air is being pushed out of the hose?
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Old 03-09-2016, 09:27 AM   #8
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wow, thanks for all the great responses, no overfill since I have had it. The bus has been leaking for a couple thousand miles, before that - not a drop. Hoping I can do some diagnostics this afternoon. Other than removing the cap/filter mesh, is there anything else I can do or inspect while in there?
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Old 03-09-2016, 09:43 AM   #9
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watching this thread....

my bus probably does the same.

its never left a drop of oil in its parking spot, but the pan is "wet" with oil.

never understood why.
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Old 03-09-2016, 09:45 AM   #10
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As Booyah suggested check to see how much air/vapor is coming from that tube when engine is warm and idling. There is no actual test that I am aware of to determine, how much is too much, it's basicly a visual, learned thing that's acquired through years of experience operating or wrenching on engines. If you are unsure get a mechanic to have a boo.
Then like he said, oil analysis then compression check would be where I'd go.
Good luck:
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