Hey guys aint been on in awhile. Anyway found out some information kinda pissed about. Alright first off replaced my front crank seal also installed a speedy sleeve and 2 hours later what do you know its leaking again kinda weird huh (yes i put in on right haha). The old seal was leakin and i did have a alittle oil coming from the draft tube so i knew their was blow by but figured more of the oil was coming from the crank seal. So i measured blow by on the engine way out of spec but the engine runs great no blue smoke at start up or while driving plenty of power so the chances of a bad oil control ring compression ring being bad is not likly so i removed the drain line from the turbo and made a line to connect to the turbo to run into a bucket and what do you know hooked the manometer back and it was way lower than orignally so i condem the turbo. Heres the part that pisses me off i ordered a aurura 3000 from etr diesel out of tennesse. I ordered the hx40 dp and 4 inch exhaust adapter for the turbo when i got the box all that was in the box was the aurura 3000 with a factory 3.5 inch ehaust adapter. So heres why i believe the turbo seals died two words drive pressure. I checked the drive pressure of the trubo and it was far from being 1:1 so i think the added stress caused the seals to wear causing my high blow by and the turbo is only been on the truck for around 1 year. So if you guys have been having the a blow by problem as i have and have a aurura 3000 with a 3.5 exhaust housing you may want to look into it. Just a heads up

 

i have never heard of a turbo causing blow by, for that to happen you would need boost or drive pressures higher than oil pressure, but if it was capeable of doing that, you would have a massive amount of oil in the boost tubes & intercooler or exhaust, and at an idle you will never exceed the oil pressure, so basically its impossible for that to happen, i cand remember if the 01 has an engine mounted vacuum pump but i believe it does, if it does the pump vents into the crankcase, and if the pump its self is going bad, or there is a vacuum leak, it will cause alot of extra blow by, if its not a vacuum pump, likely it is the rings, but its all that uncommon to have quite a bit of blow by and no other noticable problems

 

1:1 drive / boost pressure is almost impossible to achieve on a single or even on the most efficient of multiple turbo systems.

Normally on single turbo setups, you see 1.3 - 1.4 : 1 ratios at best. There is simply too much energy lost in the exhaust stream.

I'd be betting more on a broken ring.

 

well im blaming the turbo. I hooked up a manometer and the orifice to check blow by. Got measurements at idle 1500,2000,2500 then unhooked the drain off the turbo and ran it to a bucket and and reading went down considerable. And yeah it does have a engine mounted vaccum pump its around a year old. I dont think its the rings becuase the engine runs way to strong to be rings and i have no other symptons. Never had any leaks untill around 5 months after i put the turbo on.

 

once again, its impossible for the turbo to cause blowby as long as you have oil pressure, if you are opening the turbo drain, you are also opening another place to vent the blow by, therfore lowering the crankcase pressure, i would look somewhere else for a problem, if you have one

 

File: 3666193-t027-tr Page 1 of 2
Crankcase Gases (Blowby) Excessive
This is symptom tree t027
Cause Correction
STEP 1
Air compressor is malfunctioning ............
Isolate the air compressor by disconnecting the air
inlet and outlet lines. Refer to Procedure 012-003
(Air Compressor Carbon Buildup) in Section 12.
Check blowby. If blowby is within specifications,
rebuild or replace the air compressor.
OK
Go To Next Step
STEP 2
Turbocharger oil seal is leaking ............
Check the turbocharger compressor and turbine
seals. Refer to Procedure 010-040 (Turbocharger
Compressor Seal Leaks) in Section 10 or 010-049
(Turbocharger Blade Damage) in Section 10.
OK
Go To Next Step
STEP 3
Cylinder head valve guides are excessively worn ............
Check the valve guides for wear. Replace the
cylinder head if necessary. Refer to Procedure
002-004 (Cylinder Head) in Section 2.
OK
Go To Next Step
STEP 4
Pistons or piston rings are worn, damaged, or not
correct
............
Check the pistons for correct part numbers. Refer to
Control Parts List (CPL), Bulletin 3379133 or
4021327. Check the pistons and rings for wear and
damage. Refer to Procedures 001-043 (Piston) in
Section 1 and 001-047 (Piston Rings) in Section 1.



This is straight of quickserve online.
If it was impossible i dont think cummins would waste their money to publish this.

 

if you dont want listen thats fine... but its not your turbo, with the drain line off the turbo, you now have a second crankcase breather, thats why you get a different reading with it off, and under a no load condition, the turbo will make very low boost, but likely none at all, therefore making it impossible to pressuerize the crankcase, and again it would need to overcome oil pressure

 

I'm going with rings, valve seats or guides.

It ain't the turbo.