Wisconsin Motors earned legendary status building air-cooled diesel engines that powered American farms and industry for nearly a century. Known for their distinctive finned cylinders and bulletproof reliability, Wisconsin diesels like the VH4D, W4-1770, and TJD series became the trusted choice for agricultural equipment, industrial machinery, and construction applications where failure wasn't an option. Their engines featured robust cast iron construction, gear-driven components, and simple mechanical designs that delivered decades of dependable service with minimal maintenance. From compact single-cylinder models to powerful 4-cylinder workhorses, Wisconsin air-cooled diesels provided reliable power in conditions where liquid-cooled engines couldn't survive, earning fierce loyalty from operators who still keep these engines running today.

RF Engine specializes in keeping your Wisconsin-powered equipment operational with our extensive inventory of diesel engine parts and components. We understand these classic air-cooled engines remain vital to farms and businesses nationwide, maintaining a comprehensive selection of new aftermarket, remanufactured, and quality used parts for all Wisconsin diesel models—from TJD and THD series to VH4D and W4-1770 engines. Whether you're rebuilding a Wisconsin in a baler, servicing industrial pumping equipment, or restoring vintage machinery, our complete inventory covers every Wisconsin application. With increasingly rare parts availability, competitive pricing, and decades of Wisconsin engine expertise, RF Engine is your trusted source for keeping these proven American workhorses earning their keep.