13.E.T. Standardize Thermostatic Fan Drive
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THE Smiths magnetic-particle fan coupling has been specified by the British Electric Traction group of companies for all of their 1963 new vehicle programme, comprising some 700 buses and coaches. Most of the vehicles concerned are based on Leyland (Tiger Cub; Leopard, Atlantean and Titan PD2 and PD3) and A.E.C. (Reliance and AV590engined double-decker) chassis.
The coupling, incorporated in the hub of the fan, is controlled thermostatically by a temperature-sensitive switch mounted in the lower hose or bottom tank of the engine cooling system. The drive to the cooling fan is normally disconnected, and is engaged only when the engine exceeds its optimum running temperature, a comparatively rare occurrence on a modern diesel. An almost constant temperature can be maintained.
Appreciable fuel savings can be made, whilst over-cooling and consequent excessive engine wear and poor interior heater performance are avoided, Kits of parts to convert existing chassis of similar types are available from Leyland, A.E.C. or Smiths.