During the power stroke, the ignited air-fuel mixture generates immense pressure that forces itself past the piston rings and into the crankcase. Blow-by is a term describing the combustion gases that leak past the piston rings and into the crankcase of an internal combustion engine.
How Regular Oil Changes Keep Blow-By at Bay
Addressing the Crankcase Ventilation System Blow-by is managed by the crankcase ventilation (CCV) system, which recirculates the gases back into the intake manifold to be burned. While often dismissed as a minor issue, untreated blow-by creates a cascade of problems, from contaminated oil to catastrophic engine failure.
The symptoms of blow-by include blue-tinted exhaust smoke, a sudden drop in oil level, and a milky appearance of the oil filler cap or dipstick. Modern piston rings are designed with precise tension and micro-gaps to manage this pressure, directing gases into the crankcase ventilation system.
How Regular Oil Changes Keep Blow-By at Bay
However, worn rings, incorrect ring gaps, or damaged cylinder walls allow an excessive amount of gas to escape, which is when the problem escalates beyond normal operation. Installing new rings without cleaning the ring grooves properly or without ensuring the end gaps are staggered will result in the problem returning shortly after the repair.
More About How to fix blow-by in a gas engine
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