The primary pathway is between the piston rings and the cylinder wall, specifically through the end gaps and radial gaps of the compression rings. Oil blow by represents a critical yet often misunderstood phenomenon within internal combustion engines, where combustion gases bypass the piston rings and leak into the crankcase.
Oil Blow By Diagnostic Checklist: Key Signs and Solutions
A malfunctioning PCV valve or a clogged system can lead to pressure accumulation, which exacerbates seal degradation and leads to increased oil consumption and contamination. While a minimal amount of blow by is inherent to engine operation, excessive levels signal underlying issues that can compromise performance and longevity.
Mechanics of Blow By The phenomenon occurs primarily due to the pressure differential created when the combustion chamber ignites the air-fuel mixture. Instead of allowing pressure to build unchecked in the crankcase, the PCV valve routes these blow by gases back into the intake manifold.
Oil Blow By Diagnostic Checklist: Key Inspection Steps
Incorrect oil viscosity or degraded oil quality. Infrequent oil changes allow sludge and varnish to build up, hindering the rings from seating properly against the cylinder walls.
More About Oil blow by
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More perspective on Oil blow by can make the topic easier to follow by connecting earlier points with a few simple takeaways.
