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 ReplacementIf you’re dealing with low boost diesel no check engine light, you’re not alone.
This is one of the most common complaints we hear.
It’s also one of the most misdiagnosed. And because there’s no fault code, it’s easy to assume:
In reality, low boost with no warning light is usually a mechanical or system efficiency issue.
Continue reading Low Boost Diesel No Check Engine Light: Causes and Diagnosis
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.
If you’re working on engines like the Detroit Diesel Series 60, Caterpillar C15, or Cummins ISX, you’ve probably heard the term EUI.
But understanding what an Electronic Unit Injector (EUI) actually does – and how it fails – is key to diagnosing a lot of performance issues.
Because when an EUI starts to go, it doesn’t just affect fuel delivery.
It affects timing, pressure, combustion, and overall engine balance.
Continue reading What Are Electronic Unit Injectors (EUIs)?If 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 ProblemA 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 ProcessAre 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 InjectorsFarming 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 & CumminsRecently, at Highway & Heavy Parts, we’ve expanded our product offering to our customers. We now offer more fuel system components for all major OEMs.
Continue reading Highway & Heavy Parts Answers Your Diesel Engine Questions: Fuel SystemsHere at Highway & Heavy Parts, we sell a lot of turbochargers. We carry a number of the industry’s leading brands for all major OEMs, and have helped diagnose a lot of our customers’ turbo failures. We provide solutions to help get them back on the road.
Continue reading Highway & Heavy Parts Answers Your Diesel Engine Questions: TurbochargersIf 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.
