Category: Blog – Diesel Engine Tech Tips

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How to Save Up to 64% Off OEM Diesel Engine Parts (And Where Your Money Actually Goes)

OEM diesel engine parts are often treated as the standard.

They come in the original manufacturer’s packaging, follow factory specifications, and move through established dealer networks.

However, when you look at the price, the real question becomes:

👉 What are you actually paying for?

Because in many cases, the cost difference between OEM and high-quality aftermarket parts is not driven by the part itself. Instead, it’s driven by everything around it.

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Diesel Engine Failure Diagnosis: Compression Issues

There are many possible causes of engine failure. You can see our earlier post on diagnosing engine failures, too.

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Why Cummins Injector System Upgrades Change Failure Patterns (Mechanical vs CELECT vs HPI vs XPI)

Cummins didn’t just evolve injector systems to improve performance – they fundamentally changed how engines fail, how they’re diagnosed, and how repairs need to be approached.

From mechanical injectors to XPI common rail systems, each generation introduced new advantages – but also new failure modes.

If you’re diagnosing fuel system issues on a Cummins engine, understanding these differences is critical.

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Cummins Diesel Engine Serial Numbers

Look at your rocker cover: you’ll probably find your Cummins ISB engine serial number. You might also find it on the side of the gear housing. If you have a Cummins ISM engine, the serial number is on the rocker housing on the fuel pump side.

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Why Diesel Engines Use Turbochargers Instead of Superchargers

If you spend any time around diesel engines, you’ll notice something quickly:

👉 Almost all of them are turbocharged.

That’s not by accident.

While both turbochargers and superchargers are designed to increase air pressure into the engine, diesel engines overwhelmingly rely on turbochargers – and there are specific engineering reasons why.

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How to Clean EGR Pressure Ports in Diesel Engines (Without Causing Damage)

EGR pressure ports are small, but they play a critical role in how a diesel engine manages emissions and airflow.

When they clog, it can lead to:

  • Fault codes
  • Engine derate
  • Poor performance
  • Misdiagnosed EGR system failures

Cleaning them correctly matters just as much as diagnosing the issue.

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Caterpillar C15, C15 ACERT, 3406E Cylinder Head Bolts: Why They Matter More Than You Think

Cylinder head bolts don’t usually get the attention.

But on a Caterpillar C15, C15 ACERT, or 3406E, they play a critical role in engine performance and reliability.

They’re not just fasteners.

They are what keep combustion sealed.

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Black Series Lab Episode 4: Ring Tension — The Invisible Spec That Determines Engine Life

Two piston rings can look identical.

They can share the same OEM part number, measure the same dimensionally, and appear interchangeable during installation.

But one may have the correct radial tension for the application, while the other may not.

That difference is impossible to see by eye. You cannot feel it by hand. You cannot check it with a standard caliper or micrometer.

Yet ring tension can determine whether a rebuilt diesel engine seals properly, breaks in correctly, controls oil, and avoids excessive blow-by.

That is why Episode 4 of the Black Series Lab focuses on one of the most overlooked specifications in engine rebuilding: piston ring tension.

HHP Quick Takeaway

Piston ring tension is one of the most important specifications you cannot see. If ring tension is too low, the rings may not maintain proper contact with the cylinder liner during break-in, leading to glazing, blow-by, oil consumption, and poor combustion sealing.
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What Happens When a Diesel Engine Sits Too Long? (Fuel, DEF, and Internal Damage Explained)

Diesel engines are built to run – not sit.

At Highway and Heavy Parts, we regularly work with engines that come out of storage with unexpected performance issues. In many cases, the root cause isn’t a failed part: it’s what happened while the engine wasn’t running.

Whether it’s a backup truck, seasonal equipment, or a unit waiting on work, extended downtime can quietly create problems that don’t show up until the engine is put back into service.

And in many cases, those problems get misdiagnosed.

From fuel degradation to DEF crystallization and internal wear, here’s exactly what happens when a diesel engine sits too long – and what to look for before putting it back to work.

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The Real Benefits of Remanufactured Diesel Engine Parts

Remanufactured diesel engine parts offer a practical alternative to new OEM components. To understand their value, you first need to understand what “remanufactured” really means.

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10 Common Causes of Excessive Oil Consumption in Diesel Engines

Diesel engines are built for durability, but excessive oil consumption can quickly turn into a costly repair if the root cause is ignored.

If you’re constantly adding oil, noticing blue or gray smoke, or seeing a drop in performance, there’s usually an underlying mechanical reason. The key is figuring out whether the oil is being burned, leaked, pushed through the intake system, or lost because of internal engine wear.

In this guide, we’ll break down the most common causes of excessive oil consumption in diesel engines, what each one means, and what to check before it turns into a major failure.

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Why Stop-and-Go Driving Is Hard on a Diesel Engine

Stop-and-go driving is one of the hardest operating conditions for a diesel engine.

A diesel engine is designed to run under load, reach stable operating temperature, and maintain consistent combustion conditions. In stop-and-go traffic, that rarely happens.

Instead, the engine repeatedly moves through:

  • Idle time
  • Short acceleration events
  • Low-speed operation
  • Heat buildup
  • Frequent temperature changes

Over time, this can increase wear, reduce efficiency, and shorten the life of critical components

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