Cummins N14 blowby issue

jeffl1107

Member
Hey guys,
Been a while. Have a question to see what you all think. I have had what I think is excessive blowby with a little bit of oil also. It seems from what I have found that the N14 engine does not have a pcv valve or any kind of filter or element in the crankcase ventilation system that I can find. I am wondering what you guys think.
So as for the engine. The engine was rebuilt about a year and a half ago by a shop that does them regularly with all OEM parts. Heads were sent out locally and remaned. It has 125,000 on it now. I also just recently put a new air compressor on it. Last time i looked I did not visibly see any issues with the turbo. Last time I did an oil change at 10,000 it showed less than a half gallon low, probably less. The blowby or breather tube comes down right over my front axle and I do see some oil residue on it. What do you guys think. I am sure some of you will say dont worry about it right now but still would like some insight as to what you think. I know it could be possible turbo, valve seals, but hoping it is not a cracked ring or piston. No issues with the power. It is set at a soft tune 525hp. Its in a fld120 setup as a mobile home toter truck.
 

Steve Frazier

Founder
Staff member
I think I'd monitor the consumption more closely. I'm not a certified mechanic but what you're mentioning doesn't seem excessive. You mention residue on the axle but is it leaving puddles behind? I'm not familiar with these newer engine designs, my experience was in the 80s and 90s and this wouldn't be a concern.
 
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