Compression Ignition Addict
Join Date: Feb 2007
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All engines Gas or Diesels have "Blowby"
Blowby in simple terms is when gases (exhaust or unburnt fuel) pass by the piston rings and into the crank case.
The reason all engines have some form of it is because piston rings will not seal 100% from the cylinder to the crank case, therefor a little gas gets by, this can be seen like you said coming up the oil filler pipe or the CCV, remember CCV stands for Crank Case Vent so any gases in the crank case are going to get vented like they are designed to. All crank cases have to be vented.
Now, how excessive is this? You say pouring out, but try and give a little better description.
Long story short excessive blowby is an indication of worn rings, and of course it doesn't get better over time. The real way to figure out if you have an issue is to run a compression check to see if you are within specs, if you are don't worry about it, if not plan on a rebuild in the future.
Sorry for the bad new but that's the reality of it.
2003 F-350 7.3 SC
MBRP Exhaust 4in
AFE Stage II
33in Toyo MTs
DP Tuned Stock, HI, 40t, 60t, 80t, 80e, 120r, 140ex
6.0 Trans Cooler
08 Tow Mirrors
Too much mud
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Last edited by Doakster; 04-17-2008 at 08:15 AM.