The Perkins 6.372 is a diesel engine

Diesel engine

A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 manufactured by Perkins Engines Company Limited. The designation 6.372 indicates six cylinders and 372 cubic inch (6.1 litre) capacity

Engine displacement

Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre . It is commonly specified in cubic centimeters , litres , or cubic inches...

. 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

Horsepower

Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...

 in industrial form.

Turbocharged version

The T6.3724 is the turbocharged

Turbodiesel

Turbodiesel refers to any diesel engine with a turbocharger. Turbocharging is the norm rather than the exception in modern car and truck diesel engines...

version of the above engine, and the "4" on the end of the nomenclature, indicates a DOT 4 (later, improved) series engine.