Category: Blog – Diesel Engine Tech Tips

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What Diesel Techs Actually Look For Before Recommending Engine Parts

When a diesel engine comes in with a problem, experienced technicians don’t start by picking parts. Instead, they start by asking why the failure happened in the first place. However, not every failure is immediately obvious without proper inspection.

They start by asking:

What caused the failure in the first place?

Because replacing parts without understanding the root cause is one of the fastest ways to create repeat repairs.

This is the approach used by experienced diesel professionals at Highway and Heavy Parts – where real-world experience drives every recommendation.

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VGT Turbo Advantages (What Makes Variable Geometry Turbos Better?)

One of the biggest advantages of a Variable Geometry Turbo (VGT) isn’t just efficiency – it’s how it controls airflow at low engine speeds.

Because of this, VGT turbos can improve performance across a wider RPM range.

However, when that system stops working correctly, the engine feels completely different – and performance drops fast.

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Forged Steel Piston Crowns for Caterpillar C15 & 3406E: What You Need to Know

When you’re rebuilding a Caterpillar C15 or 3406E, piston design matters more than most people realize.

One of the most critical components in that system is the piston crown.

And for these engines, forged steel piston crowns are one of the most proven and durable options available.

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Diesel Fuel Algae: What It Is, How to Treat It, and How to Prevent It

If your diesel engine keeps clogging fuel filters, losing power, stalling, or pulling dark sludge from the tank, you may hear someone say you have “diesel algae.”

That term is common, but it is not technically correct.

Diesel fuel algae is usually not algae at all. True algae needs sunlight to grow, and fuel tanks are dark environments. What people call diesel algae is usually microbial contamination made up of bacteria, fungi, yeasts, mold, and biofilm living in the fuel system.

This contamination is often called diesel bug.

The problem starts when water enters the fuel tank. Microbes live in the water and feed on hydrocarbons in the diesel fuel. Over time, they create dark, slimy sludge that can plug filters, restrict fuel flow, damage injectors, corrode tanks, and leave equipment stranded.

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Automatic vs Manual Transmissions in Diesel Trucks: What’s the Difference?

Diesel engines are known for low-RPM torque, strong pulling power, and durability under load.

Because of that, the transmission behind the engine matters.

A diesel transmission has to manage:

  • High torque output
  • Heavy loads
  • Heat generation
  • Gear changes under load
  • Driver control

The biggest difference between automatic and manual transmissions is how power gets from the engine to the wheels and how gear changes are controlled.

For diesel trucks, there is also a third category that matters: automated manual transmissions.

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Important Differences Between Caterpillar 3406E, C15, and C15 Acert Diesel Engines

How do you pick the right diesel engine model? This is a challenging task. You’ll need plenty of information if you’re deciding between the Caterpillar 3406E, C15 ACERT, or C15 engine. And we have as much information as you can get to make an informed decision.

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Top 5 Common Yanmar Engine Problems (and How to Prevent Them)

Yanmar engines have earned a reputation for reliability in marine, agricultural, construction, and industrial applications. Many Yanmar engines provide thousands of hours of dependable service when maintained properly.

However, no diesel engine is immune to wear, contamination, heat, or neglected maintenance.

The good news is that many of the most common Yanmar engine failures are preventable. Understanding the warning signs early can help reduce downtime, avoid expensive repairs, and extend engine life.

Let’s look at five of the most common problems seen in Yanmar diesel engines.

Quick Takeaway: Most common Yanmar engine failures involve fuel delivery, cooling system performance, exhaust restrictions, injector wear, or compression loss. Many of these problems can be prevented through routine maintenance and early diagnosis.
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Cylinder Head Bolt Stretch vs Torque: Why Your Head Gasket Keeps Failing

When a head gasket fails, most people look at the gasket.

But in many diesel engines, the real issue isn’t the gasket at all: it’s improper clamp load caused by incorrect bolt stretch.

If clamp load isn’t correct or consistent across the cylinder head, combustion pressure will find a way out.

This is where understanding bolt stretch vs. torque becomes critical.

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Replace the Injector Hold-Down Bolts on Your Diesel Injectors

Are you looking to replace the fuel injectors on your CAT 3406E, C15, or C15 ACERT diesel engine? If so, it’s probably fair to assume that you want the best quality, highest functioning injectors you can get. And, if you’re spending money on quality injectors, you want them to work correctly. 

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Original OEM Diesel Injector Compared to Genuine Bosch Injector

What do you do when you need new injectors for your DD13, DD15, or DD16 diesel engine? If you’re like a lot of people, you head to the dealership to get the OEM parts. But that’s not always convenient and can be expensive. In fact, you could end up paying way more at the dealership then some of your other supplier options.

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Diesel Fuel Grades Explained: #1 vs #2 vs #4 (What You Should Actually Be Running)

Not all diesel fuel is the same.

Most people think diesel is just diesel – but in reality, there are different fuel grades, and each one behaves differently inside your engine.

The three main types you’ll hear about are:

  • #1 Diesel
  • #2 Diesel
  • #4 Diesel

Understanding the difference matters: because the wrong fuel choice can lead to poor performance, fuel system issues, or even downtime in extreme conditions.

Continue reading Diesel Fuel Grades Explained: #1 vs #2 vs #4 (What You Should Actually Be Running)