A Study of Trucks Engine Failure Related to Environmental Conditions

Abstract

On operating new trucks in one of the areas of the Egyptian western desert, unexpected fast engine failure occured. Although the technical maintenance to these trucks, was regularly done, the engine failure took place after covering 26000 Km only. In the meantime, no similar failures of trucks operating in other zones have been reported. Therefore, the main reason that led to the engine failure was attributed to the environmental conditions characterised by high dust concentration and relatively high temperature.After reviewing the air and cil filteration systems of the damaged engine and making the necessary inspection and measurements it could be said that the failure occured mainly due to inefficient oil filteration. SUMMARY-Upon uitilization of new trucks, in dusty zones, ofEgypt, unexpected failure of some engines occured after covering a relatively short distance. In the mean time, no failures in simillar engines operating in other zones have been recorded The main reason of the failure was attributed to the environmental field conditions characterized by high dust concentration and relatively high temperature. The engine failure was manifested by a high drop in the oil pressure and a noizy engine run. After reviewing the air and oil filteration systems of a one damaged engine, and making the necessary inspection, it could be said that the failure reason is the inefficient oil filteration. A new oil filter had to be designed by the engine manufacturer. The old and the new filters have been tested on a special testing rig designed and conducted by the author. The test rig enabled to evaluate the oil filter performance under simulated local environmental conditions. To determine the actual performance of the new filter, a similar engine provided with the new filter has been tested. The test results showed no drop in the oil pressure, and no excessive engine noize. This results proved the efficiency of the new filter under dusty conditions of Egypt. 101)-2312;7] SECOND A .m. E CONFERENCE 6 -8 May 1986 , Cairo r . . .