Category: Blog – Ask the Diesel Engine Experts

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Most Common Engine Rebuild Kit Problems in Diesel Engines

A diesel engine rebuild kit can completely change the life of an engine — but only if everything is installed, measured, and matched correctly.

The reality is:
👉 Many engine rebuild failures are not caused by the rebuild kit itself.

They are caused by:

  • Improper installation
  • Incorrect measurements
  • Poor machining
  • Cooling system issues
  • Lubrication problems
  • Contamination left inside the engine
  • Reusing damaged components

Even the highest-quality diesel engine rebuild kit can fail quickly if the root cause of the original failure was never corrected.

That is why successful diesel rebuilds depend on:

  • Proper diagnostics
  • Precision measurements
  • Careful assembly
  • Cleanliness
  • Correct break-in procedures

A diesel engine rebuild is much more than simply “installing new parts.”

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The Complete Guide to Cummins Engine Rebuild Kits: Maximizing Performance and Value

Cummins Engine Rebuild Kits

When your Cummins diesel engine starts showing signs of wear, you face a critical decision: replace the entire engine or invest in a comprehensive engine rebuild. For fleet operators and owner-operators alike, Cummins engine rebuild kits represent the smart choice for restoring engine performance while maintaining cost control. These carefully engineered kits provide everything needed to bring your engine back to like-new specifications without the premium price of a complete replacement.

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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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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.

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Why Most Heavy-Duty Diesel Trucks Use Inline-6 Diesel Engines

If you look at almost any modern long-haul truck in the United States, you’ll find one thing in common:

👉 An inline-6 diesel engine under the hood.

That’s not a coincidence.

It comes down to balance, torque delivery, efficiency, and long-term durability – all critical factors for moving heavy loads over long distances.

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Choosing the Right Diesel Engine Common Rail Fuel Injectors

The common rail fuel injector system is a relatively new development in diesel engines, but it brings with it quite a few advantages. With a quality common rail system, you’ll see quieter performance, improved fuel economy, higher torque, and lower emissions. 

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Highway & Heavy Parts Answers Your Diesel Engine Questions: Fuel Systems

Recently, at Highway & Heavy Parts, we’ve expanded our product offering to our customers. We now offer more fuel system components for all major OEMs.

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Why Clean Oil Matters More Than You Think (And How It Protects Your Diesel Engine)

If you’ve already invested in diesel engine parts, you already understand how critical performance and reliability are.

But there’s one system that impacts everything else, and it’s often overlooked:

Your lubrication system.

Clean oil is not just about maintenance. It directly affects how long your components last and how efficiently your engine operates.

Continue reading Why Clean Oil Matters More Than You Think (And How It Protects Your Diesel Engine)
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Diesel Engine Common Rail Injection Explained

We’ve talked a lot about issues you might experience with your diesel engine common rail injectors. But it’s not all about the problems! You also get  a lot of benefits for having this kind of fuel injection system in your diesel engine.

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What to Know Before Buying Connecting Rod Bearings

Connecting rod bearings are one of the smallest components inside a diesel engine, but they play a massive role in long-term engine reliability.

Improper bearing selection, incorrect oil clearance, installation mistakes, or inaccurate measurements can quickly lead to oil pressure loss, crankshaft damage, metal contamination, bearing failure, and catastrophic engine damage.

That is why connecting rod bearing selection should never involve guesswork.

Proper bearing fitment depends heavily on crankshaft journal measurements, housing bore condition, oil clearance verification, engine application, and the condition of the surrounding rotating assembly components.

Quick Takeaway:
Connecting rod bearings must match the exact crankshaft journal size, oil clearance requirements, and engine application. Assuming “standard” always fits can lead to serious engine damage.
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