Engines Factory supplies premium remanufactured and rebuilt Caterpillar diesel engines for heavy-duty truck, construction, industrial, agricultural, marine, generator, and commercial applications. Our inventory includes CAT long block engines, drop-in diesel engines, rebuilt replacement engines, and complete diesel powertrain solutions engineered for reliability, durability, and exact application fitment. Popular Caterpillar diesel engine platforms include CAT C7, 3126, 3116, 3176C, 3208, 3304, 3306, and C15 ACERT engines used in trucks, vocational equipment, generators, loaders, excavators, and industrial machinery throughout the United States.