Variable Geometry Turbochargers (VGTs) are designed to adjust airflow dynamically—but when they fail, one issue shows up more than any other:
Sticking vanes. If the vanes can’t move, the turbo can’t control boost properly.
And that leads to:
The challenge is this:
Not every VGT problem is actually a bad turbo.
Continue reading Why Diesel VGT Turbo Vanes Stick (And How to Tell If It’s the Turbo or the Actuator)If you’re hearing a squeal, chirp, or grinding noise coming from the front of your diesel engine, there’s a good chance the belts – or the components they drive – are involved.
But not all belt noise is actually caused by the belt itself.
The challenge is figuring out:
The crankshaft is essentially the backbone of your truck’s engine. It keeps the engine moving and is vital to the overall health of your rig. When this critical component begins to fail in a Cummins ISX, it can quickly lead to severe mechanical damage and costly downtime. Recognizing the early warning signs of a worn or damaged crankshaft is essential to minimizing negative impacts to your revenue and keeping your truck out of the service bay.
Continue reading Diagnosing a Bad Cummins ISX Crankshaft: Symptoms and Replacement
The exhaust manifold on a Caterpillar C15 ACERT does more than route exhaust gases.
It directly affects:
If the manifold is leaking, cracked, or restricting flow, the entire engine suffers.
And in ACERT engines, those problems show up fast.
Continue reading Caterpillar C15 ACERT Exhaust Manifold: Performance, Failure Symptoms, and Upgrade Benefits
On a Cummins N14, fuel injectors are one of the most critical components controlling engine performance.
They don’t just deliver fuel – they control timing, atomization, and combustion efficiency.
And when they start to fail, the issue doesn’t stay isolated to one cylinder. It begins to affect engine balance, temperature, and long-term durability.
Continue reading Cummins N14 Fuel Injectors: How They Fail, What It Affects, and When to Replace ThemHow 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.
Continue reading Important Differences Between Caterpillar 3406E, C15, and C15 Acert Diesel EnginesWhen 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.
Continue reading Cylinder Head Bolt Stretch vs Torque: Why Your Head Gasket Keeps FailingEGR systems are a standard part of modern diesel engines – but they are also one of the most common sources of frustration.
These systems are designed to reduce emissions and meet EPA regulations. However, they also introduce additional components that operate under high heat, pressure, and contamination.
Over time, this combination can lead to performance issues, costly repairs, and system failures.
Continue reading Problems with EGR Systems in Diesel EnginesAre 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.
Continue reading Replace the Injector Hold-Down Bolts on Your Diesel InjectorsHard starts in cold weather are one common diesel complaint.
And a lot of times, it comes back to one thing:
Glow plugs not doing their job.
Glow plugs are responsible for heating the combustion chamber so the engine can start when it’s cold. If one or more fail, you’ll start seeing issues like long crank times, white smoke, or rough startup.
The good news is: testing them is straightforward if you follow the right process.
Continue reading How to Test Glow Plugs on a Diesel Engine (Step-by-Step Guide)Resurfacing a cylinder head is a precision machining process used to restore a flat, uniform sealing surface between the cylinder head and engine block.
In diesel engines, this surface is critical.
👉 Even minor irregularities can lead to head gasket failure, compression loss, or coolant leaks.
If resurfacing is required, it must be done correctly – both in preparation and execution.
Continue reading How to Resurface a Diesel Engine Cylinder Head (Step-by-Step Guide)Elevation directly impacts diesel engine performance because it changes one critical variable: air density
As altitude increases, atmospheric pressure decreases. This reduces the amount of oxygen available for combustion inside the cylinder.
Diesel engines depend on oxygen – not throttle restriction – to control combustion.
👉 When oxygen availability drops, engine performance changes.
Continue reading How Elevation Affects Diesel Engine Performance
