Diesel Fuels & Diesel Fuel Systems
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Filter or centrifuge used oil before putting it in the fuel tanks to prevent premature fuel filter plugging, accelerated wear, or plugging of fuel system parts. Soot, dirt, metal, and residue particles larger than 5 microns (0.000197 in.) should be removed by this process. If filtering or centrifuging is not used before adding the oil to the fuel, primary filters with 5 microns (0.000197 in.) capability must be located between the fuel supply and engine. These will require frequent servicing. Clean handling techniques of the used crankcase oils are essential to prevent introducing contaminants from outside sources into the diesel fuel supply. Care must be taken in collecting, storing and transporting the used crankcase oil to the diesel fuel tanks. Diesel fuel day tank sight glasses may become blackened in time due to the carbon content in the crankcase oil. Ash content of the lube oil added to the fuel may also cause accumulation of turbocharger and valve deposits more rapidly than normal.
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Application and Installation Guide
Continuous Blending If the installation warrants, used lubricating oil can be blended and used in the engine in a continuous manner. The normal method uses a centrifuge module similar to Figure 9. The following information describes this system. Centrifuge No. 1 Engine crankcase oil is continuously centrifuged except when the clean waste oil tank is low, at which time the dirty waste oil is centrifuged and directed to the clean waste oil tank. Centrifuge No. 2 Distillate fuel/oil mixture daytank is continually centrifuged. Metering Pump Adds up to 5% clean waste oil to the distillate fuel (from the main supply tank) when the daytank low level switch calls for more fuel. Static Mixer Runs when the metering pump is on to insure a proper homogeneous mixture of the fuel and clean waste oil. The centrifuge module is electronically controlled and includes the components within the dotted line as shown in Figure 10. Size the system for appropriate fuel delivery.
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