Figure 3-41.—Possible causes of insufficient power in an engine.be no apparent resistance to the motion of the rack if thereturn springs and linkage are disconnected. A stuckcontrol rack may be caused by the plunger’s sticking inthe pump barrel; dirt in the rack mechanism; damage tothe rack, sleeve, or gear; or improper assembly of theinjector pump.If the rack sticks or jams, you must determine thecause and replace any damaged parts. If sticking is dueto dirt, thoroughly clean all the parts to correct thetrouble. You can avoid errors in assembly by carefullystudying the assembly drawings and instructions.Leakage of Fuel OilLeakage of fuel oil from the injectors may cause anengine to continue to operate when you attempt to shutit down. Regardless of the type of fuel system, the resultsof internal leakage from injection equipment are, ingeneral, somewhat the same. Injector leakage will causeunsatisfactory engine operation because of theexcessive amount of fuel entering the cylinder. Leakagemay also cause detonation, crankcase dilution, smokyexhaust, loss of power, and excessive carbon formationon the spray tips of nozzles and other surfaces of thecombustion chamber.Accumulation of Lube OilAnother trouble that may prevent you from stoppingan engine is accumulation of lube oil in the intake airpassages-manifold or air box. Such an accumulationcreates an extremely dangerous condition. You candetect excess oil by removing the inspection plates onthe covers and examining the air box and manifold. Ifyou discover oil, remove it and perform the necessary3-37
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