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What Is Blow-By On A Diesel Engine And Its Causes?

What Is Blow-By On A Diesel Engine And Its Causes?

Diesel vehicle owners frequently struggle with the serious build-up of carbon deposits and engine contamination from time to time.

The reason why the engine of your car Behaves in such a way is a blow-by on a diesel engine.

Now you must be wondering what is blow-by on a diesel engine, right?

It’s not a common issue, but a drastic one that can significantly reduce the vehicle’s engine’s performance.

Specific causes are responsible for this behavior of your vehicle engine.

So, let’s understand why diesel engine working that way and what does blow-by gas mean:

What Is Blow-by On A Diesel Engine? Causes & Solutions

When the cylinder wall and piston have a faulty seal, it can seriously affect the engine’s performance and allow the air-fuel mixture to leak into the engine crane. This is what we call blow-by gas in a diesel engine.

Low performance, lesser torque and power, even more oil consumption may be the possible causes of this.

It is always advised that experts use some effective maintenance tips for more understanding.

Now, let’s see what causes it and how it affects the vehicle.

1.Worn Pistons.

One of the facts that can answer your question is, what is blow-by on a diesel engine and what causes it is the worn pistons.

Unlike the cylinder walls that magnify wear and tear, pistons tend to become smaller.

Aluminum is a soft metal that easily allows accumulation in the combustion chamber and creates grooves in the piston.

And, this means fuel-air mixture will accumulate in the crankcase.

Over time of use, worn pistons cause blow-by in engine

2. Damaged Cylinder Walls

Another possible reason that can lead to blow-by on a diesel engine is the damaged cylinder walls. With continuous usage, the vehicle and its components are depleted. This includes cylinder walls as well.

The continuous piston and scraping of the piston ring lead to damaged cylinder walls.

This creates a gap in the cylinder, making it bigger, leading to easy passage of the compressed gases into the piston.

We hope that these points help you to understand what is diesel blow-by easier.

Worn out cylinders can never perform the way it should.

So, it is always recommended to keep the cylinder.

3. Smashed Piston Rings.

The third reason could be those smashes piston rings.

When looking for an answer for ‘what does blow by mean on a diesel,’ this is a crucial point to mention.

Smashed or damaged piston rings can lead to blow-by on a diesel engine.

Relentless grinding of rings back and forth in the cylinder damages it, eventually.

One can expect the sealing abilities of the piston ring to fail drastically with time.

This certainly leads to gases easily sneaking around the back of the ring, thus simply leads to blow-by on a diesel engine.

mashed pistol rings are the culprits of blow-by


We believe that you might have answered what is blow-by on a diesel engine and what causes it. 

It is recommended to keep an eye on the piston, piston rings, and even the cylinder to ensure that your vehicle is functioning properly.

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