12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Blow by tube?!!

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Old 04-12-2012, 07:02 PM
gyayo2012's Avatar
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Default Blow by tube?!!

Is it normal for your blow by tube to blow smoke while the truck is running idle, only after iv run the truck and let it idle it will smoke?.. just recently started doing this... any ideas?? Thanks!..
 
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Old 04-13-2012, 10:24 AM
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At idle there is less combustion pressure to seat the rings against the cylinder wall and after heating up it will let a little past but shouldnt look like a fog machine under your truck. Check for vacuum leaks too.
 
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Old 04-13-2012, 03:39 PM
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yeah its smoking pretty good.. all my vac looks g00d. notihng out of the ordinary you think my rings are shot?? id love to give her a compresion check do you know what the compression should be at?
 
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Old 04-13-2012, 05:29 PM
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Anything over 400 you should be good. In my opinion i wouldn't want to see less than 375. Also you don't want to see a huge difference between two adjacent cylinders
 
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Old 04-13-2012, 09:46 PM
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If its not useing oil I wouldnt worry about it to much because mine does the same thing but it doesent use any oil so I dont worry about it to much.But thats just my opinion.
 
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Old 04-14-2012, 02:47 PM
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thanks for the help guys im just going to live with it for now. truck runs like a clock so theres no point in trying to fix something that isnt really broken i guess!.. waiting for my buddy to bring me by a comp test ill post up what my reading were, im assuming its all g00d had to bring my bobcat back home today and the truck wasnt complaining so neither sould I
 
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