Des Moines Diesel is a family owned and operated business. Jim Porter founded Tacoma Diesel and Equipment Inc. in the 1970's and was known as the Jim Porter Company prior to that time. trademarks in business. We are an authorized, full service, Caterpillar, Detroit Diesel, Yanmar, Kohler and Perkins dealer. We offer sales and product support for diesel engines, generators, marine transmissions, and ancillary equipment.