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Blow By is this normal???
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=48771		 Page 1 of 1
Author:  adrianmiura [ Mon Dec 28, 2009 12:30 pm ]
Post subject:  Blow By is this normal???
Looking at a 2005 CRD Liberty with 71K. after a short test drive i checked the blow by and was shocked at the amount of "gas" being expelled. If my LB7 Duramax was doing that I would have serious concerns.
I have attached a link to a short video of the blow by any feedback would be greatly appreciated
Thank you,

http://www.youtube.com/watch?v=-qzXs6G4kMM
Author:  dgeist [ Mon Dec 28, 2009 3:01 pm ]
Post subject:  Re: Blow By is this normal???
adrianmiura wrote:
Looking at a 2005 CRD Liberty with 71K. after a short test drive i checked the blow by and was shocked at the amount of "gas" being expelled. If my LB7 Duramax was doing that I would have serious concerns.
I have attached a link to a short video of the blow by any feedback would be greatly appreciated
Thank you,

http://www.youtube.com/watch?v=-qzXs6G4kMM


It depends on if it smelled like exhaust... It might not have been blow-by at all and was just normal oil vapor. There's a reason many of us have CCV filters :) The ratio of displacement to overall vapor expansion capacity is probably greater in the little inline 4 than you're used to on your duramax. Ultimately, a compression test or just smelling the fumes will tell you more than my speculation, though.

Dan
Author:  kccrd [ Mon Dec 28, 2009 7:50 pm ]
Post subject:  Re: Blow By is this normal???
That looks completly normal to me. We have a crank case ventilation that you can attach a hose to and run into a catch container instead of sending all those vapors back throuth the turbo charger like they are from the factory. I have run mine into a catch can for about 100k and no problems I just have to change the paper towels about every other month after they get completly soaked with oil. Much better than sending it back through the turbo.
Author:  adrianmiura [ Mon Dec 28, 2009 11:03 pm ]
Post subject:  Re: Blow By is this normal???
Thanks for the replies,
My wife and I went ahead with the purchase. This looks like a great site with loads of info. look forward to doing the "ProVent" or the crank case ventilation system.

Adrian
Author:  painemann [ Fri Jan 01, 2010 8:13 am ]
Post subject:  Re: Blow By is this normal???
Mine looks the same, I was wondering the same because my 7.3L ford has almost none and if it did I guess it's no good!
Author:  warp2diesel [ Fri Jan 01, 2010 8:41 pm ]
Post subject:  Re: Blow By is this normal???
Your Duramax is a V8 with more overlap between power strokes. As you can see the CRD blows it out and sucks it back in with the oil fill cap off. I would not worry about it.
Author:  painemann [ Mon Jan 04, 2010 8:34 pm ]
Post subject:  Re: Blow By is this normal???
warp2diesel wrote:
Your Duramax is a V8 with more overlap between power strokes. As you can see the CRD blows it out and sucks it back in with the oil fill cap off. I would not worry about it.

Good to know, its normal !
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