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A large number of diesel engine failures have been reported in the immediate past. The large proportion of these engines that were investigated, were recently overhauled engines that failed soon after the overhaul process. In some cases, these engines failed on the dynamometer, while it was tested before delivery to the customer. The most common failure on a large number of these engines, were pistons seizing in the crown region causing seizure of the piston in the cylinder. When these failures were investigated the problem could be traced back to combustion irregularities. The injector which was usually newly fitted as a genuine part, became sticky causing poor vapouration of the diesel. The stickiness of the injector tip was found to be due to poor lubricity of the fuel. Diesel engine principles and operation. The piston of a diesel engine fits tightly in the cylinder to provide high compression in order to cause ignition of the injected fuel. Fuel is delivered in metered quantities to the cylinders, at very high pressures and is broken up in a fine spray with droplets usually smaller than 20 microns. This is done by forcing the fuel through small orifices at very high pressures. Causes of poor spray patterns, Leaking of the needle on the seat of the injector tip. Sticking needle.
source:http://www.abco.co.za/
Tags : crown region, engine principles, spray patterns, engine failures, fine spray, high pressures, abco, high compression, dynamometer, diesel engine, orifices, stickiness, microns, irregularities, piston
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