386 Diesel Engine Technology Copyright Goodheart-Willcox Co., Inc. 3. Technician A says that the pilot or delay pintle nozzle is used to create a cone shaped spray pattern. Technician B says that this type of nozzle reduces the amount of fuel injected in the early stages of injection. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. 4. All of the following can be manipulated to affect the injector spray pattern, EXCEPT: (A) nozzle hole size. (B) spray angle. (C) injector pressure. (D) spring pressure. 5. Injector nozzles should receive general maintenance _______. (A) every 1000 hours of operation (B) when a fuel system problem arises (C) only if the fuel shows evidence of contamination (D) every 600-1000 days of operation 6. All of the following can reduce injector life, EXCEPT: (A) abrasives. (B) high sulfur content in the fuel. (C) frequent fuel filter replacement. (D) excessive heat. 7. Technician A says that disabling a faulty injector will affect engine idle less than disabling a good injector. Technician B says that cleanliness cannot be over- stressed when servicing the fuel injection system. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. 8. Technician A says that high injector opening pressures must be used on turbocharged engines. Technician B says that high nozzle opening pressures may make for rougher low speed idling and more difficult starting. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. 9. All of the following may be used to clean varnish from injector nozzles, EXCEPT: (A) clean diesel fuel. (B) 15% caustic soda solution. (C) air agitated solvent tank. (D) ultrasonic cleaner. 10. All of the following should be done when bleeding the fuel system, EXCEPT: (A) place the fuel control to the full fuel position. (B) crank the engine until fuel is visible at all nozzle connections. (C) tighten all lines after bleeding. (D) if line leakage is present, flush out any dirt by cranking the engine for two minutes.