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 Performance
Head gasket problems on the Caterpillar C15 are rarely random.
They are almost always tied to:
If you’re seeing coolant, oil, or pressure issues – especially toward the left side or rear of the engine – you’re already looking in the right place.
Continue reading Caterpillar C15 Head Gasket Problems: Failure Points, Diagnosis, and Replacement
If a Caterpillar C15 starts to smoke, miss, haze at idle, or loses power under load, injectors are high on the list: but guessing is what gets engines hurt.
On many C15 variants (notably HEUI systems), injectors are hydraulically actuated by high-pressure engine oil. That means injector performance depends on two systems at once:
When either side is off, injector behavior changes.
With a healthy system:
Any deviation should be traced to a cylinder, then to a cause – not straight to parts replacement.
Mechanism
What happens
Hard indicators
Why it matters
Mechanism
What happens
Hard indicators
Key point
Electrical faults can look identical to mechanical injector failure – verify before replacing.
Mechanism
What happens
Hard indicators
Result
Mechanism
What happens
Hard indicators
Mechanism
What happens
Hard indicators
Mechanism
What happens
Hard indicators
Key point
This is often misdiagnosed as “bad injectors”.
Do not start with parts. Start with isolation.
Result
Why
Low supply pressure affects all injectors and mimics failure.
Why
No actuation pressure = no injector performance.
Look for:
Fuel wash indicates:
→ injector leaking into that cylinder
Result
Reason:
Injectors rarely fail in isolation.
Common root causes:
If the root cause isn’t fixed:
→ new injectors will fail again
Most repeat failures come from:
Injectors are often the symptom, not the cause.
C15 injector problems are not just about replacing parts.
They’re about:
That’s how you prevent:
Shop here:
👉 Caterpillar C15 Fuel Injectors
Or call 844-304-7688 to speak with a diesel expert.
From diagnosis through delivery, we’re Highway and Heavy Parts.
A failed head gasket on a Caterpillar C15 isn’t just a sealing issue – it’s usually the result of improper clamping force, liner height variation, or thermal stress inside the engine.
Replacing the gasket without addressing the underlying cause often leads to repeat failure.
Understanding why the gasket failed is critical before installing a new cylinder head gasket set.
Continue reading Caterpillar C15 Head Gasket Failure: Root Causes, Symptoms, And Proper Repair ProcessIf you’re dealing with low power, smoke, or oil around the turbo on a Caterpillar C15 ACERT, it’s easy to assume the turbocharger has failed.
But that’s not always the case.
At Highway and Heavy Parts, we see this all the time – turbos get replaced, but the original problem is still there. That’s because many turbo “failures” are actually symptoms of fuel system issues, oil problems, or internal engine wear.
Before replacing your turbo, it’s critical to understand what’s really going on.
Continue reading Why Your Caterpillar C15 ACERT Turbocharger Might Not Be the Real ProblemIn 1993, Caterpillar began production on the 3406E, the last model engine in the 3406 series. While its predecessors –the A, B, and C– were fully or partially mechanical, the Caterpillar 3406E was the first successful fully electronic motor. The 3406E is usually found in Peterbilt and Freightliner vehicles.
Continue reading About The Caterpillar 3406E
Steam tractors became the go-to tool for agricultural development in the late 1800s/early 1900s. Although their use was widespread, this machinery wasn’t perfect; they didn’t work everywhere. In California, these immensely heavy tractors kept sinking into the soft earth.
Continue reading About the Caterpillar C15 Engine
Dinex Emission is a company that has been dedicated to helping diesel operators meet the high standards of the EPA for a very long time. Though the EPA’s goal is to reduce the emissions of dangerous gasses into the air, their restrictions can often make transporting goods, completing construction projects, and harvesting large crops more difficult. As an expert in the field of diesel emissions control, Dinex has long been the solution to this obstacle.
Continue reading Dinex Emission: The Solution to Diesel Pollution
Garrett, a name synonymous with turbocharging technology, has long been a leader in the diesel performance world. Their turbochargers are renowned for reliability, innovative design, and ability to elevate engine performance.
Continue reading Revving Up Performance: A Look at Garrett Diesel TurbochargersWhen a diesel engine throws a fault code, it’s easy to assume the problem is straightforward.
But in real-world diagnostics, that’s rarely the case.
👉 A fault code points you in a direction – it doesn’t tell you the root cause.
For repair shops, fleet managers, and owner-operators, understanding what these codes actually mean in practice is what prevents:
Below are some of the most common diesel engine fault codes – and what’s really behind them.
Continue reading Most Common Diesel Engine Fault Codes (And What Actually Causes Them)Farming equipment and machines breakdown at times, just like diesels on the highway. They’re exposed to harsh environments and long hours of operation.
Continue reading Diesel Engine Serial Numbers for Agriculture Engines John Deere, Caterpillar & CumminsIf you checked out our earlier post answering turbocharger customer questions, you may have found answers to the reasons why your CAT 3406E/C15 turbocharger is lacking performance. Maybe it’s time to replace that worn out turbo with something new.
Continue reading What You Should Know About the CAT 3406E/C15 Diesel Engine TurbochargerHighway and Heavy Parts is your trusted source for over 250,000 replacement diesel engine parts, including a comprehensive selection of Caterpillar engine components. Whether you’re maintaining fleet vehicles or heavy equipment, we carry the parts you need to keep your Caterpillar engines running at peak performance. This, combined with our ASE Certified service team, makes us industry experts and qualified to write about everything Caterpillar-related.
On this page, you will find blogs that discuss common Caterpillar issues, diesel engine part highlights, and how-tos.
Engine Components & Service Parts
Our extensive Caterpillar inventory includes essential engine components such as engine blocks, pistons, fuel injectors, and turbochargers. From routine maintenance items to major engine rebuild components, we stock everything required for C15, C15 ACERT, 3406E, and other popular Caterpillar engine models.
Quality You Can Trust
At Highway and Heavy Parts, you’ll get parts that have been manufactured in an ISO 9001:2015 certified facility, ensuring quality and consistency for your Caterpillar equipment. Our commitment to quality ensures you receive parts engineered for durability and long-lasting performance.
Fast, Reliable Service
Order by 2PM EST, and in-stock items will ship the same day (M–F), ensuring minimal downtime for your equipment.
We understand the importance of keeping your fleet operational and ready for work.
Expert Knowledge & Support
Highway and Heavy Parts, LLC is owned and operated by diesel engine experts.
We know the importance of keeping a delivery fleet on the road. Our team combines decades of experience with comprehensive product knowledge to help you find the right parts for your specific application.
Comprehensive Parts Selection
You can quickly and easily find the precise part you need with our large range, saving you time and effort. From gaskets and seals to major engine components, our inventory covers the full spectrum of Caterpillar parts needs.
While Caterpillar has a long and storied history of producing top-notch diesel engines and was known for construction and mining equipment, they also produced engines for on-highway applications. Though Caterpillar has discontinued their truck engine production, existing equipment still requires quality replacement parts and ongoing maintenance support.
Browse our complete selection of Caterpillar parts today and experience the Highway and Heavy Parts difference – where quality meets reliability for all your heavy-duty diesel engine needs.
