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Fuel Control Racks
Figure 3*42. Additional causes of irregular engine operation

Engineman 2 - Intermediate engine mechanics training manual
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Figure 3-41.—Possible causes of insufficient power in an engine. be no apparent resistance to the motion of the rack if the return  springs  and  linkage  are  disconnected.  A  stuck control rack may be caused by the plunger’s sticking in the pump barrel; dirt in the rack mechanism; damage to the rack, sleeve, or gear; or improper assembly of the injector  pump. If the rack sticks or jams, you must determine the cause and replace any damaged parts. If sticking is due to  dirt,  thoroughly  clean  all  the  parts  to  correct  the trouble. You can avoid errors in assembly by carefully studying the assembly drawings and instructions. Leakage of Fuel Oil Leakage of fuel oil from the injectors may cause an engine to continue to operate when you attempt to shut it down. Regardless of the type of fuel system, the results of  internal  leakage  from  injection  equipment  are,  in general, somewhat the same. Injector leakage will cause unsatisfactory   engine   operation  because  of   the excessive amount of fuel entering the cylinder. Leakage may also cause detonation, crankcase dilution, smoky exhaust, loss of power, and excessive carbon formation on the spray tips of nozzles and other surfaces of the combustion   chamber. Accumulation of Lube Oil Another trouble that may prevent you from stopping an engine is accumulation of lube oil in the intake air passages-manifold  or  air  box.  Such  an  accumulation creates  an  extremely  dangerous  condition.  You  can detect excess oil by removing the inspection plates on the covers and examining the air box and manifold. If you discover oil, remove it and perform the necessary 3-37







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