From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Informational leaflet promoting the use of TOCCO-hardened crankshafts in Yellow Coach buses.
| Identifier | ExFiles\Box 132\4\ scan0049 | |
| Date | 8th January 1937 guessed | |
| YELLOW COACH USES TOCCO-HARDENED CRANKSHAFTS The new 36-passenger Diesel electric Yellow Coach, equipped with Hercules Diesel Engine and electric drive. The crankshafts of all Hercules Diesel Engines are TOCCO-hardened. A large fleet of these modern and efficient new buses is being built by the General Motors Truck Corporation for Public Service Coordinated Transport of New Jersey. THE General Motors Truck Corporation of Pontiac, Michigan, is the world's largest bus manufacturer. Hercules Motors Corporation of Canton, Ohio, is the world's largest independent builder of heavy-duty engines. Public Service Coordinated Transport of New Jersey is the world's largest local bus operator. The aim of all three companies has been to develop the most efficient and advanced unit of passenger transportation—combining improved riding comfort and safety with lowered operating costs. They all agree that the TOCCO-hardened journals in the Diesels will materially increase the periods between necessary bearing adjustments, will lower maintenance expense and lengthen the life of the engines. The General Motors Truck Corporation has been using the TOCCO PROCESS to harden the crankshaft journals of their own model 450 gasoline engines for a year. Other leading manufacturers who after long, comparative tests have already adopted the TOCCO PROCESS include the Autocar Company, the Cummins Engine Company, the International Harvester Company, the Packard Motor Car Company, the Waukesha Motor Company and the White Motor Company. The TOCCO PROCESS of surface hardening by electrical induction produces an exact result. Shafts can now be hardened quickly at small cost and at the bearing points only—to 58-60 "C" scale Rockwell hardness (600 Brinell). This permits harder bearing metals and longer-lived engines. The net result is reduced maintenance cost and elimination of excessive oil consumption—important factors in all heavy duty operations. The illustration above shows the Hercules DRXB, 4⅜" x 5¼", 6-cylinder, high-speed, heavy-duty Diesel Engine, with General Electric electric generator installation, mounted transversely in the rear of the new Yellow Coach Diesel electric bus. All models of Hercules Diesel Engines have TOCCO-hardened crankshafts. | ||