Your fuel injectors are what keep your diesel engine running at its best. If you want solid diesel engine performance, then you need to use your injectors effectively. There’s a specific system your injector uses to improve engine performance: trim codes.
Continue reading About Diesel Injector Trim CodesCategory: Blog – All HHP Blog Articles
Diesel Cylinder Head Cracking: 4 Causes, Symptoms & Prevention
Diesel cylinder head cracking is one of the most serious issues an engine can face – and one of the most expensive if it’s not caught early.
What makes it worse is that it often starts small.
A minor overheating event, a stress point in the casting, or an installation issue can eventually turn into coolant loss, compression problems, and complete engine failure.
Understanding what causes cylinder head cracking – and what to look for – can help prevent repeat failures and unnecessary downtime.
Continue reading Diesel Cylinder Head Cracking: 4 Causes, Symptoms & PreventionCity 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 ExplainedCaterpillar 3406B, 3406C Engine Rebuild Kit: What It Fixes and Why It Matters
The Caterpillar 3406B and 3406C are known for durability.
But like any diesel engine, they don’t last forever without internal wear.
Over time, compression drops, oil consumption increases, and performance starts to decline.
When that happens, a complete solution like a Caterpillar 3406B, 3406C engine rebuild kit becomes necessary.
Continue reading Caterpillar 3406B, 3406C Engine Rebuild Kit: What It Fixes and Why It MattersCaterpillar C15, C15 ACERT, and 3406E Cylinder Head: Failure Symptoms, Causes, and When to Replace
The cylinder head on a Caterpillar C15, C15 ACERT, or 3406E is one of the most critical components in the engine.
It controls:
- Combustion Sealing
- Airflow into the Cylinders
- Exhaust Flow out of the Engine
- Fuel Injector Operation
When the cylinder head starts to fail, it doesn’t stay contained. It affects the entire engine.
Continue reading Caterpillar C15, C15 ACERT, and 3406E Cylinder Head: Failure Symptoms, Causes, and When to ReplaceCaterpillar C12 Inframe Rebuild Kit: What It Includes, When You Need It, and How It Restores Performance
If your Caterpillar C12 is losing power, burning oil, or showing signs of internal wear, you may be getting close to a rebuild.
And when that time comes, an inframe rebuild kit is one of the most efficient ways to restore engine performance without removing the entire engine.
But knowing when to rebuild – and what’s actually included – makes all the difference.
Continue reading Caterpillar C12 Inframe Rebuild Kit: What It Includes, When You Need It, and How It Restores PerformanceWhat One Day of Downtime Actually Costs a Truck
In trucking, a truck only makes money when it is moving.
When it is not moving, costs do not stop.
👉 Downtime is any period when a truck is out of service and not generating revenue.
This includes:
- Mechanical failures
- Waiting on parts
- Shop delays
- Accidents
- Compliance issues
Even a single day of downtime can have a measurable financial impact.
Continue reading What One Day of Downtime Actually Costs a TruckShould Diesel Engine Oil Changes Be Based on Hours or Miles?
If you ask ten diesel technicians whether oil changes should be based on engine hours or mileage, you’ll probably get ten different answers.
The truth is, both measurements have value—but they don’t tell the whole story on their own.
For heavy-duty diesel trucks, the way an engine is used often matters more than how many miles are on the odometer. A truck that spends hours idling, operating a PTO, or crawling through traffic may accumulate just a few miles while putting significant wear on the engine and its oil. Meanwhile, a long-haul truck cruising steadily down the interstate may accumulate hundreds of miles under relatively ideal operating conditions.
So which should you trust—engine hours or miles?
The answer depends on how your truck works.
HHP Quick Takeaway
For many heavy-duty diesel trucks, engine hours provide a more accurate picture of engine wear than mileage alone. However, the best maintenance schedule considers engine hours, mileage, operating conditions, the engine manufacturer’s recommendations, and—when possible—oil analysis.
For many heavy-duty diesel trucks, engine hours provide a more accurate picture of engine wear than mileage alone. However, the best maintenance schedule considers engine hours, mileage, operating conditions, the engine manufacturer’s recommendations, and—when possible—oil analysis.
Continue reading Should Diesel Engine Oil Changes Be Based on Hours or Miles?
Diesel Fuel Additives: What They Do, When They’re Used, and What to Consider
Diesel fuel additives are commonly used in both light-duty and heavy-duty applications.
They are not a single product type. Instead, they are formulated blends designed to address specific fuel system conditions or operating environments.
Depending on formulation, diesel fuel additives may be used to:
- Clean fuel system components
- Improve combustion characteristics
- Support cold-weather operation
- Protect fuel system parts from wear
👉 The effectiveness of an additive depends on fuel quality, engine condition, and application.
Continue reading Diesel Fuel Additives: What They Do, When They’re Used, and What to ConsiderWhy Correct Fuel Injector Trim Codes Still Result in Poor Engine Performance
You’ve replaced the injectors.
You’ve programmed the trim codes correctly.
Everything checks out – and the engine still runs rough.
This is more common than most people realize.
Fuel injector trim codes are designed to fine-tune fuel delivery, but they are not a fix-all. If the engine is still underperforming, the issue is almost always outside the trim code itself.
Continue reading Why Correct Fuel Injector Trim Codes Still Result in Poor Engine PerformanceMajor Diesel Engine Manufacturers Around the World
If you work around diesel engines long enough, you’ll start to recognize the same names.
Across trucking, construction, agriculture, marine, and power generation, a group of manufacturers has built engines designed to handle load, heat, and long hours.
This guide is a simple overview of the major diesel engine manufacturers around the world – what they build and where you’ll see them.
Cummins Inc. (United States)
Cummins produces diesel engines for on-highway trucks, industrial equipment, and power generation.
You’ll commonly see them in:
- Heavy-duty trucks
- Medium-duty applications
- Generators and industrial equipment
They are widely used due to broad support and application range.
Caterpillar Inc. (United States)
Caterpillar engines are built for high-load applications like construction, mining, and marine.
You’ll find them in:
- Construction equipment
- Mining operations
- Marine vessels
- Industrial application
These engines are known for durability in demanding environments.
Detroit Diesel (United States)
Detroit Diesel focuses on on-highway truck engines.
You’ll find them in:
- Long-haul trucks
- Fleet operations
- Freightliner applications
They are designed for consistent highway performance and emissions integration.
Volvo Group (Sweden)
Volvo builds diesel engines for trucks, construction equipment, and marine use.
They also produce engines for:
- Mack Trucks
Their engines focus on integrated systems and efficiency across applications.
Scania (Sweden)
Scania produces diesel engines for trucks, industrial equipment, and power generation.
They are known for:
- Efficient engine design
- Strong performance in commercial transport
FPT Industrial (Italy)
FPT Industrial manufactures diesel engines for:
- On-road trucks
- Off-road equipment
- Marine and power generation
They focus on multi-application engine platforms.
Deutz AG (Germany)
Deutz specializes in compact diesel engines used in:
- Construction equipment
- Agricultural machinery
- Material handling
Their engines are known for simple, durable designs.
Rolls-Royce Power Systems (Germany)
MTU engines are used in high-performance applications like:
- Marine vessels
- Military equipment
- Power generation
They are built for continuous operation under heavy load.
Mitsubishi Heavy Industries (Japan)
Mitsubishi produces diesel engines for:
- Industrial equipment
- Marine systems
- Power generation
Their engines are built for long-duration operation.
Yanmar Co., Ltd. (Japan)
Yanmar specializes in smaller diesel engines used in:
- Agricultural equipment
- Compact machinery
- Marine applications
They focus on efficiency and reliability in smaller platforms.
Kubota Corporation (Japan)
Kubota builds compact diesel engines for:
- Construction equipment
- Utility vehicles
- Agricultural machinery
They are widely used in smaller equipment applications.
Isuzu Motors (Japan)
Isuzu produces diesel engines for:
- Medium-duty trucks
- Industrial applications
They are known for reliable commercial engine platforms.
Hino Motors (Japan)
Hino manufactures diesel engines for:
- Commercial trucks
- Fleet vehicles
They are commonly used in regional and medium-duty transport.
Perkins Engines Company Limited (United Kingdom)
Perkins engines are used in:
- Agriculture
- Construction
- Power generation
They are known for reliable industrial engine platforms.
John Deere Power Systems (United States)
John Deere produces diesel engines for:
- Agricultural equipment
- Construction machinery
- Forestry and industrial applications
They focus on application-specific engine performance.
Komatsu (Japan)
Komatsu builds diesel engines used in:
- Construction equipment
- Mining machinery
These engines are designed for heavy-duty off-highway use.
Liebherr (Germany/Switzerland)
Liebherr produces diesel engines for:
- Mining
- Construction
- Cranes and industrial equipment
They focus on high-load, specialized applications.
What All These Manufacturers Have in Common
No matter the size or application, these engines are built around the same fundamentals:
- Durability Under Load
- Thermal Management
- Fuel System Precision
- Long Service Life
The design may change: but the goal stays the same:
👉 Keep equipment running reliably in real working conditions.
Why This Matters
Knowing the manufacturer helps you understand:
- How the engine is designed
- What systems it uses
- Where problems are likely to show up
Because the same issue – like loss of power or overheating – can have different causes depending on the engine platform.
Final Takeaway
There’s no single “best” diesel engine manufacturer.
Each one is built for a specific purpose.
What matters is:
- Using the right engine for the job
- Maintaining it properly
- Diagnosing problems based on how it was designed
Because in diesel engines, reliability comes down to understanding the system – not just the name on it.
Need Help Identifying or Diagnosing Your Engine?
If you’re working on a diesel engine and need help figuring out:
- What platform you’re dealing with
- Common issues
- The right parts
Visit highwayandheavyparts.com
Or call 844-304-7688 to speak with a diesel parts specialist
From diagnosis through delivery, we’re Highway and Heavy Parts.
Why Garrett Turbochargers Are Trusted Worldwide in Heavy-Duty Diesel Engines
When a turbocharger fails on a working diesel engine, it’s not just a parts issue: it’s downtime, lost revenue, and often a deeper underlying problem.
That’s why the turbocharger you choose matters.
Across Caterpillar, Detroit Diesel, and International/Navistar platforms, one name consistently shows up in both OEM applications and reliable aftermarket replacements: Garrett Turbochargers.
There’s a reason for that.
Garrett turbos aren’t just widely used – they’re engineered for consistency under load, thermal durability, and long-term reliability in real-world conditions.
Quick Takeaway:
Turbocharger reliability depends on more than boost pressure alone. Heat management, rotor balance, oil supply stability, and airflow consistency all affect long-term diesel engine performance.
Continue reading Why Garrett Turbochargers Are Trusted Worldwide in Heavy-Duty Diesel Engines Turbocharger reliability depends on more than boost pressure alone. Heat management, rotor balance, oil supply stability, and airflow consistency all affect long-term diesel engine performance.
