Caterpillar Remanufactured Diesel Engines
C7, C13, C15, 3406 & Industrial Diesels
Get premium remanufactured Caterpillar diesel engines for semi-trucks, construction equipment, and industrial applications. Our CAT engines include the popular C7, C13, C15, and legendary 3406 series, all rebuilt to OEM specifications.
Caterpillar Engine Specifications
| Engine | Displacement | Config | Horsepower | Torque | Applications |
|---|---|---|---|---|---|
| C15 ACERT | 15.2L | I6 | 435-625 hp | 1,550-2,050 lb-ft | Peterbilt, Kenworth, Freightliner, Western Star |
| C13 ACERT | 12.5L | I6 | 380-520 hp | 1,450-1,750 lb-ft | Peterbilt, Kenworth, Freightliner |
| C7 ACERT | 7.2L | I6 | 190-330 hp | 520-860 lb-ft | Medium-duty trucks, buses, RVs |
| 3406E | 14.6L | I6 | 350-550 hp | 1,350-1,850 lb-ft | Peterbilt, Kenworth, Freightliner |
| 3126 | 7.2L | I6 | 175-300 hp | 420-860 lb-ft | Medium-duty trucks, school buses |
| C12 | 12.0L | I6 | 340-445 hp | 1,250-1,550 lb-ft | Vocational trucks, fire trucks |
About Caterpillar Engines
Caterpillar has been building diesel engines since 1931 and became a major force in the on-highway truck market. The 3406 series dominated trucking for decades, while the ACERT-technology C13 and C15 engines powered a new generation of Class 8 trucks before CAT exited the on-highway market in 2010. These engines remain popular and well-supported.
Caterpillar's entry into the on-highway truck engine market transformed the industry. The 3406 series, introduced in the 1970s, became the engine of choice for owner-operators who valued power and reliability. The 3406E, with electronic controls, was particularly popular and many are still in service today with well over a million miles. In 2003, Caterpillar introduced ACERT (Advanced Combustion Emissions Reduction Technology) in the C13 and C15 engines, which used a unique approach to meeting emissions standards without EGR (exhaust gas recirculation) in early models. The C15 ACERT became one of the most powerful and fuel-efficient Class 8 engines available, with ratings up to 625 hp. In 2010, Caterpillar made the surprising decision to exit the on-highway truck engine market, but their engines continue to be widely used and supported. The C7 remains popular in medium-duty applications, while the C15 and 3406 are staples of the used truck market. Caterpillar continues to manufacture engines for construction, mining, marine, and power generation applications.
Caterpillar Engine Buying Guide
When purchasing a remanufactured Caterpillar engine, the engine serial number prefix is the most important identifier. For the C15, common prefixes include 6NZ (most popular, pre-ACERT), BXS (early ACERT), and MXS (late ACERT with twin turbos). Each has different performance characteristics and emissions compliance levels. The 3406E uses prefixes like 5EK, 6TS, and 2WS. For medium-duty applications, the C7 comes in ACERT and pre-ACERT versions. Always provide the full engine serial number when requesting a quote — this ensures you receive an engine with the correct horsepower rating, emissions certification, and accessory configuration for your specific truck or equipment.
Caterpillar Diesel Engine Series
Explore each Caterpillar engine series in detail — specs, common issues, compatible vehicles, and pricing for remanufactured engines.