Blow-by is not just a symptom.
It is a direct result of combustion pressure escaping past the piston assembly.
On a Detroit Diesel DD15, controlling blow-by comes down to one thing:
How well the piston, rings, and liner seal under load.
If that seal fails, everything else starts to follow.
Continue reading DD15 Diesel Engine Pistons: How They Control Blow-By and What Causes Failure







