How to Break In a Rebuilt Diesel Engine the Right Way
You just invested serious money into a diesel engine rebuild process. The machining is done, the parts are fresh, and the engine is ready to install. But here's where most...

HD Engines is a leading supplier of quality used diesel truck engines and engine parts. With one of the most extensive inventories in the industry, we stock a full range of engines from top manufacturers including Cummins, Detroit Diesel, Isuzu, John Deere, International, Mercedes, Ford, Paccar, Volvo, Mack, and Caterpillar (CAT).
Our inventory goes beyond complete truck engines—we also carry equipment engines, industrial engines, and marine engines, ensuring solutions for both on-highway and off-highway applications.
We provide a wide selection of engine components and rebuild parts, including engine blocks, cylinder heads, ECMs, and more, making us a trusted partner for engine rebuilders, repair shops, and fleet operators nationwide.
At HD Engines, we pride ourselves on delivering reliable products, competitive pricing, and fast turnaround times. Most engines are available for same-day shipping, with flexible freight options to meet your deadlines.
Explore our full range of Caterpillar (CAT) engines available for purchase. All models are carefully inspected and listed with clear information. Browse our inventory to find a reliable CAT engine that fits your needs.
Explore our full range of Cummins engines available for purchase. All models are carefully inspected and listed with clear specifications and details. Browse our inventory to find a dependable Cummins engine that meets your performance and application requirements.
Whether you’re looking for a replacement engine, hard-to-find components, or a cost-effective solution for your fleet, HD Engines has the experience and inventory to keep you running strong.
You just invested serious money into a diesel engine rebuild process. The machining is done, the parts are fresh, and the engine is ready to install. But here's where most...
The CAT 3406 engines are heavy-duty diesel engines widely known for their durability, but they require proper maintenance to avoid expensive breakdowns. This guide explains exactly how to maintain CAT...
A Tier 4 diesel engine is the latest EPA-regulated diesel engine designed to drastically reduce harmful emissions like NOx and particulate matter while improving fuel efficiency. These engines are required...