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Old 03-09-2016, 09:57 AM   #11
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Oh and dred, please keep us all updated on the outcome. And just out of curiosity how many miles on this engine?
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Old 03-09-2016, 10:25 AM   #12
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Quote:
Originally Posted by one_eyed_jack View Post
Oh and dred, please keep us all updated on the outcome. And just out of curiosity how many miles on this engine?
Will document

160k not a hint of smoke
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Old 03-09-2016, 11:36 AM   #13
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Yes turf it is quite common on this era diesel engines to have these road-draft vent tubes which will expell more and more oil as the engine wears and piston/ring clearances get greater. Cylinder walls get glazed too, so compression pressure gets past the rings into the crankcase, soňo, that pressure, has to go somewhere and as this flow increases it carries more and more vapor and droplets with it.
For those of you who are not familiar with these engines and may only have experience with passenger vehicles, you may or may not know that this blow-by is handled in a different way. Since the late 50's early 60's this 8blow-by is re-circulated and drawn back into the intake manifold to be re-burned. So although your grocery-getter may have just as much blow-by (or maybe even more if it's a high-miler) as your, new-to-you, bus, you wont see it cause it's getting sucked-in & re-burned. Older (pre-sixties) cars and light trucks all used to have these open, road-draft crankcase vents and they were always marking-their-territory with varying sized drops (depending on their age/milage) of oil.
Hope this helps to relieve some of the mystery for you.
CHEERS ALL:
One_Eyed_Jack
P.S. One drop of oil splattered all over your under-carriage always looks like a Lot more.
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Old 03-09-2016, 11:43 AM   #14
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You covered that very well.
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Old 03-09-2016, 01:30 PM   #15
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Dred, there is nothing to really see by pulling that filter off. There are no baffles behind it or really anything to inspect. It's just odd that it went from nothing to a quart every 200 miles, all the while it's not down on power, misfiring, or blowing smoke. A quick way to test if you have excessive blow by is to remove the oil fill cap in the valve cover while the engine is running at idle. If you have a bunch of airflow out the hole then it's ominous. Here is a video .

Just out of curiousity, what oil do you run? and do you know what oil the district happened to run?
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Old 03-09-2016, 01:49 PM   #16
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I want to post the video, get some responses from it, then discuss further

for reference






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Old 03-09-2016, 01:56 PM   #17
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from the filler cap

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Old 03-09-2016, 03:35 PM   #18
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after seeing your videos and starting up my bus and locating the blow by tube, i think my oil leak is elsewhere.

i have a bit of air coming out of both the tube and the filler cap. but my leak is further in front of the location of the blow by tube.

good luck with it!
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Old 03-09-2016, 06:24 PM   #19
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It's not a new one by any means, but it doesn't look that bad imo, not quart/200 miles territory by any means. You got me baffled by it. You never mentioned what oil you run?
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Old 03-09-2016, 06:34 PM   #20
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15/40 is spec'ed, been running that for 5 months, 6k miles or so
I am with you, does not seem bad at all, at least from the "Cummins blow by" videos I have been watching. I think it is something else
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