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Old 07-11-2016, 07:49 PM   #121
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So now I am CONVINCED the "oil leak" is caused by pressure. It is extremely variable - yesterday just outside of Butte, I put 1/2 gallon in (<40 miles), after seeing a typical - big puddle/little puddle




But here is the kicker.....
After driving another 80 miles to Missoula, smaller to no hills, almost no oil loss(less than a quart) and two small drops(much like I Left Billings AND Buffalo with after repair)




So I really want to explore the pressure option, as the variable leak is baffling me.

So, Christopher, how did you resolve your Peugot leak?
unfortunately in my peugeot it was Very high amount of blow-by because I had broken one of the compression rings on 2 different cylinders.. the cylinders still fired.. thioyg hthe engine started up a tad rough on cold mornings... plus that car had baffles and a type of filter to try and curb the blow-by smoke... that filter would get blasted with oil and then cause even higher crankcase pressure which just blew oil out of any seal it could find..

the resolution for me was replacing that filter / baffle thingie with an updated version from a VW.. and then of course rebuilding the engine so I had good rings...

-Christopher
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Old 07-11-2016, 08:16 PM   #122
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Can you temporarily run with the oil filler cap removed? That should provide a much bigger crankcase vent path.. though perhaps there'll be a significant amount of oil mist exiting along with the blow-by gases. But would it be less oil exiting through there than is new (theorized to be) exiting through the breather or past the seals?

An oil analysis would reveal blow-by through contamination with fuel and/or soot wouldn't it? So long as it wasn't too diluted with fresh oil, that is.
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Old 07-11-2016, 09:22 PM   #123
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does the cummins blowby tunbe not just point at the ground? on my IHC engine i have a tube that comes from the crankcase and just points at the ground... is the cummins recirculating the blowby into the valve cover?
-Christopher
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Old 07-11-2016, 11:28 PM   #124
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Can you temporarily run with the oil filler cap removed? That should provide a much bigger crankcase vent path...
too much splash to do that.
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Old 07-11-2016, 11:30 PM   #125
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does the cummins blowby tunbe not just point at the ground? on my IHC engine i have a tube that comes from the crankcase and just points at the ground... is the cummins recirculating the blowby into the valve cover?
-Christopher

the blowby points towards the ground, I can catch oil.
My concern is blockage in any EGR apparatus, although I cant find any exit tub from the crankcase? I would really like to bypass that system, running around any valves or filters if I can, just cannot figure out where they are?
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Old 07-12-2016, 07:36 AM   #126
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the blowby points towards the ground, I can catch oil.
My concern is blockage in any EGR apparatus, although I cant find any exit tub from the crankcase? I would really like to bypass that system, running around any valves or filters if I can, just cannot figure out where they are?
I know PCV is often the cause of oil leaks in gasoline engines.. .. in older GMC engines it would often pop a weak point in a pan gasket.. the blow-by tube should handle that in a diesel

im not familiar with EGR in diesels.. however EGR shouldnt be putting pressure on the crankcase.. it should be exhaust manifold to air intake and not hit the crankcase.. if there is a crankcase recirculation system that sends crankcase gasses to the intake then that could be a source.. then I would think you woulkdnt havbe a blow-by tube then..

my Bus is too old to have an EGR system.. i just have a blow-by tube which i never see anything come out of.. at least not at idle or if I brake torque it a bit...

is it possible the engine is just worn enough you are making huge amounts of blow-by causing the high crankcase pressures? just curious if any of the shops have taken compression on the cylinders? like in my peugeot it still seem to run and drive and didnt have a skip or a miss even though i had busted rings..

-Christopher
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Old 07-12-2016, 09:16 AM   #127
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is it possible the engine is just worn enough you are making huge amounts of blow-by causing the high crankcase pressures? just curious if any of the shops have taken compression on the cylinders? like in my peugeot it still seem to run and drive and didnt have a skip or a miss even though i had busted rings..

-Christopher
I would think if I had that badly damaged engine that it would show SOME smoke, and I have NONE?
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Old 07-12-2016, 09:25 AM   #128
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I would think if I had that badly damaged engine that it would show SOME smoke, and I have NONE?
my peugeot didnt smoke... if you have worn compression rings but good oil rings you wont burn oil as the oil ring still sweeps the oil off the cylinder wall on the intake stroke so it doesnt end up in the cylinder to burn..

compression smoke would only be an issue perhaps on cold start and if the compression were low enough that cylnder was having trouble burning fuel..

I would think thoiugh that youd see some blow-by smoke from the tube at idle... on my peugeot I rember a pulsation of blow-by smoke from that tube at idle.. not alot but some.. since it was a pulsation in tiune wit hthe rhythm of the engine i surmised that it was an issue in one (then 2) cylinders and not engine wide... it smoked on startup a bit more than it had previously...

of course that was a little 4 cylinder car diesel vs a big truck engine like we are dealing with.. but it was a mechanical diesel with the Bosch fuel injection system..

you almost need a go pro on the front bumper pointed under the bus to see what the blow-by tube looks like when you hammer a heavy hill....

-Christopher
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Old 07-18-2016, 06:45 PM   #129
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Well Dred it's been almost a week....Wassup?
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Old 07-20-2016, 11:33 AM   #130
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Well Dred it's been almost a week....Wassup?
Sorry, been up in the woods (almost in Canada) enjoying life without Interwebs. Back in civilization today, headed back to Missoula. After close to 200 miles I have added less than a quart, think the takin-er-easy approach is working..... for now.



a little preview of what I have HAD to endure for the last few days....


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