The seal has a PTFE-filled-bronze cap and nitrile-rubber energizer. It’s considered a low-friction, long-life seal. ... the total tribological system — the piston seal surface, ...

This will cause the seal on the piston rings to break, which can let the compressed air of the combustion chamber escape. ... If the crankcase pressure is too much, the cap will get blown off.

Battling Blow-By. First and foremost, ensuring a diesel engine has optimal ring seal is the best way to ward off blow-by, especially for severe-duty powerplants that endure high boost pressures ...

Blow-by can harm an aging engine, but a certain amount is normal for most vehicles. Here is how to tell when there's too much blow-by in your diesel engine.