Blow-by, also known as oil blow-by or engine blow-by, refers to the leakage of combustion gases or pressure into the engine’s crankcase, often occurring when exhaust gas passes the piston rings ¹ ². This can lead to issues like poor engine performance, increased fuel consumption and damage to engine parts ³. Blow-by is a common problem in diesel engines, and it can be caused by worn-out piston rings, eroded cylinders or pistons, and high carbon levels ¹. Regular maintenance and the use of additives can help prevent blow-by ².
Pros and Cons
Here are the pros and cons of engine blow-by:
Pros of Oil Blow – by :
- Minor blow-by is a normal and harmless phenomenon in engines
- It can indicate that the engine is breaking in and the piston rings are seating properly
- In some cases, blow-by can help to remove excess oil from the engine’s crankcase
Cons of Oil Blow – by:
- Excessive blow-by can lead to:
- Oil consumption and loss
- Increased emissions and pollution
- Reduced engine performance and power
- Increased risk of engine damage and failure
- Higher maintenance costs
- Potential for engine oil to enter the exhaust system and cause damage
- Increased risk of overheating and engine damage
- Blow-by can be a sign of worn or damaged piston rings, cylinders, or other engine components
It’s important to note that while some blow-by is normal, excessive blow-by can be a sign of a serious problem and should be addressed promptly to avoid further damage to the engine.
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