The Perkins 6.372 is a diesel engine manufactured by Perkins Engines. The designation 6.372 indicates six cylinders and 372 cubic inch (6.1 litre) capacity. It is derived from the 6.354 (six cylinder, 354 in³ or 5.8L, L6 engine) bored out with a 0.100" larger bore. It produces 112 horsepower in industrial form.
The T6.3724 is the turbocharged version of the above engine, and the "4" on the end of the nomenclature, indicates a DOT 4 (later, improved) series engine.