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Diesel Engine Blow-By: How Much Is Normal and When Should You Be Concerned?

If you’re seeing vapor coming from the breather or crankcase vent, you’re probably asking:

Is this normal or is my engine going bad?

That’s where a lot of confusion comes in.

Some blow-by is completely normal. But excessive blow-by can point to internal wear, poor sealing, or a bigger issue building over time.

The key is knowing the difference.

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Diesel Engine Rocker Arms vs Pin and Roller Kits: What Actually Wears Out and Why It Matters

When diagnosing valvetrain issues in a diesel engine, rocker arms are often overlooked.

But on engines like Cummins ISX, Detroit Diesel Series 60, and Caterpillar platforms, rocker arm assemblies – and more specifically the pin and roller components – are critical wear points.

Understanding the difference between replacing a full rocker arm versus servicing pin and roller kits can prevent repeat failures and unnecessary downtime.

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City Driving vs Highway Driving: Engine Impact Explained

The difference is not just speed.

It is how the engine is loaded, how often it changes state, and how long it stays in stable operating conditions.

City driving introduces:

  • Frequent acceleration from a stop
  • Repeated deceleration and braking
  • Idle time with no load
  • Shorter run cycles

Highway driving introduces:

  • Steady engine speed (RPM)
  • Continuous load
  • Stable operating temperature
  • Fewer transient events

These differences directly affect internal engine conditions.

Continue reading City Driving vs Highway Driving: Engine Impact Explained