Diesel Education Archives

Posted on November 13, 2025June 12, 2026 by David Ley

Diesel Engine Basics: The Main Parts of a Diesel Engine and What They Do

Diesel engines may look complicated from the outside, but most of their major systems work together toward one goal: turning fuel, air, compression, and heat into usable power.

Unlike gasoline engines, diesel engines do not use spark plugs to ignite the fuel. Instead, a diesel engine pulls in air, compresses that air until it becomes extremely hot, and then injects fuel into the cylinder. The heat from compression ignites the fuel, forcing the piston downward and turning the crankshaft.

That process is called compression ignition.

Modern diesel engines are more advanced than ever, but the basic systems remain the same. Whether you are working on a Caterpillar, Cummins, Detroit Diesel, International/Navistar, Paccar, Mack, Volvo, John Deere, Ford, Mercedes-Benz, Chevy/GMC, Dodge, or Perkins engine, the major parts all have specific jobs to do.

Diesel Engine Basics: A diesel engine needs air, fuel, compression, lubrication, and cooling to work properly. When one of those systems fails, performance, reliability, and engine life can all be affected.

Posted on September 15, 2025June 25, 2026 by David Ley

Black Series Lab Episode 1: Why Your Cylinder Liners Are Never Actually Round

Most diesel technicians assume a brand-new cylinder liner comes out of the box perfectly round and ready to install.

However, advanced dimensional analysis shows that even new production liners contain small amounts of geometric variation throughout the liner surface.

While these variations are often microscopic, they can still influence:

ring sealing,
oil control,
blow-by behavior,
and long-term rebuild reliability under operating conditions.

That is exactly what Highway and Heavy Parts explores in Black Series Lab– Episode 1. In this episode, we examine:

cylinder liner roundness,
dimensional stability,
storage conditions,
advanced measurement technology,
and why standard inspection methods may not always reveal the full picture during a diesel engine rebuild.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

What Is Day-to-Day Life Really Like as a Diesel Mechanic?

A lot of people are interested in becoming diesel mechanics because they:

Love trucks and equipment
Enjoy working with their hands
Want a stable career
Like problem-solving
Want to avoid sitting behind a desk all day

However, many people only see one side of the industry. They see:

Big trucks
Toolboxes
Engine rebuilds
Cool diagnostic equipment

…but they do not always see the reality of the day-to-day work.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

Is It Hard to Be a Diesel Mechanic?

Being a diesel mechanic is not an easy career – but that is also part of what attracts many people to it.

Modern diesel technicians are expected to understand:

Mechanical systems
Electrical diagnostics
Emissions systems
Hydraulics
Computer-controlled engines
Troubleshooting and repair procedures

At the same time, the work can be physically demanding and fast-paced.

However, for many technicians, the challenge is also what makes the career rewarding.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

Can a Diesel Mechanic Make $100K a Year?

Yes: diesel mechanics can absolutely make over $100,000 per year.

However, that level of income usually depends on several factors, including:

Experience
Skill level
Certifications
Specialization
Overtime
Geographic location
Industry type

Not every diesel technician earns six figures, especially early in their career. However, highly skilled technicians in the right industries can reach or exceed 100K consistently.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

Diesel Mechanic Interview Questions: What to Expect and How to Prepare

Interviewing for a diesel mechanic position is different than interviewing for many other jobs.

Most employers are not just looking for someone who can replace parts.

They want to know if you can:

Diagnose problems accurately
Work safely and efficiently
Understand modern diesel systems
Communicate with a team
Handle real-world shop pressure

Some questions will be basic interview questions. Others will focus heavily on diagnostics, troubleshooting, and experience with diesel systems.

This guide breaks down common diesel mechanic interview questions and explains what employers are typically trying to learn from each one.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

What Is a Class 8 Truck? A Guide to Heavy-Duty Commercial Trucks

Class 8 trucks are the largest and heaviest commercial vehicles commonly operated on public roads in the United States.

These trucks are designed for:

Heavy freight hauling
Long-distance transportation
Construction work
Vocational applications
High-weight commercial operations

When most people think of a semi-truck, tractor-trailer, or 18-wheeler, they are usually thinking about a Class 8 truck.

These vehicles are the backbone of freight transportation across North America and play a major role in industries like:

Heavy equipment transportation
Trucking
Agriculture
Construction
Waste management
Oil and gas

Posted on June 11, 2025June 25, 2026 by Caitlyn Vance

Inframe vs. Out-of-Frame Engine Rebuild Kits: Which One Does Your Diesel Engine Actually Need?

When a heavy-duty diesel engine begins showing signs of major wear or internal failure, one of the biggest decisions a repair shop or owner-operator faces is: inframe rebuild or out-of-frame overhaul?

Choosing the wrong rebuild strategy can dramatically impact:

downtime,
labor cost,
long-term reliability,
and overall repair expense.

Some engines only require an inframe rebuild to restore compression, oil control, and lower-end stability. Others require complete engine removal and total teardown to properly address severe internal damage.

Understanding the difference between these two rebuild paths is critical before ordering parts or beginning teardown.

Quick Takeaway:
Inframe rebuilds are commonly used when the block and crankshaft remain serviceable, while out-of-frame overhauls are typically required when severe lower-end damage or structural engine issues are present.