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The U. S. Naval Engineering Experiment Station's experience with cavitation-erosion failures of several engine crankcase designs are described. A unique test procedure involving the use of soft test plugs was developed for rapid evaluation of possible corrective measures required for a naval 600-horsepower aluminum crankcase design. A wide-band cylinder water seal, designed and developed to prevent crankcase cavitation-erosion failures, is described. In both laboratory and Fleet tests, the new seal prevented cavitation-erosion in the critical water seal areas of the aluminum crankcases of these engines.

Motor vehicles for a public utility are WORK machines, not moving billboards and not even payload haulers. Simple, functional designs are favored, and multifunction design is urged. The midrange of trucks, 20-60 thousand gvw, has been designed for pavement operation, with many features completely unsuitable for public utility across field, across lots, and in rough-country construction and maintenance work. Better bottom protection of parts, components, and accessories is needed for PU, construction, mining, and export services. Engines and cooling systems should be designed for near-continuous stationary operation. Dual-engine trucks or auxiliary engines as stationary power source, are needed for wider range of performance and reasonable economy. More hp is needed in PU work. Manufacturer options are limited. 348 cu in. engines are available for sedans, but the same manufacturer offers a maximum optimum of only 283 cu in. engine for a 22,000# gvw truck.