4-11. The  temperature  at  the  bulb  of  the temperature  regulator  drops  below  the  set temperature  and  the  valve  position indicator shows COOLER CLOSED. Which of the  following  remedial  measures  should you  take? 1. Secure  the  packing  gland  nut  wrench tight 2. Grind  the  valve  seats  until  a  perfect seal  is  achieved 3. Insert the bulb into the ship's piping  in  the  horizontal  position with the arrow on the indicator disk point  downward 4. Insert the bulb into the ship's piping in the vertical position with the nut at the top of the unit 4-12. Why should a liquid filled bulb of a temperature  regulator  be  installed either  in  the  vertical  position  with  the nut  up  or  in  the  horizontal  position  with the arrow up? 1. To allow the liquid level to be above the  end  of  the  internal  capillary tube 2. To allow the liquid level to be below the  capillary  tube 3. To  prevent  liquid  from  effecting  the bellows 4. To ensure that the arrow on the indicator  disk  is  always  pointing upward When  answering  questions  4-13  through 4-15, assume you are in the process of adjusting a  temperature  regulator  to  the  diesel engine  freshwater  cooling  system. 4-13. The  manual  crankpin  should  be  rotated until  the  pointer  is  aligned  with  which of  the  following  marked  positions  on  the indicator  plate? 1. Cooler  closed 2. Cooler  bypass 3. Thermostatic 4. Each of the above 4-14. When is the indicator slid up or down for adjustment  to  the  proper  position? 1. After  the  lower  end  of  the  seating sleeve  comes  in  contact  with  the lower  end  of  the  thermostatic  stem 2. Before  the  lower  end  of  the  seating sleeve  comes  in  contact  with  the lower  end  of  the  thermostatic  stem 3. After  the  lower  end  of  the  seating sleeve  comes  in  contact  with  the upper  end  of  the  thermostatic  stem 4. Before  the  upper  end  of  the  seating sleeve  comes  in  contact  with  the lower end of the valve stem 4-15. The  indicator  plate  is  secured  and  the pointer  and  thermostatic  center  marks  are aligned. What  is  the  final  valve  stem adjustment  you  should  make  prior  to tightening  the  locknut? 1. Two  complete  turns  into  the thermostatic  stem  past  the  seating sleeve  contact 2. One  complete  turn  into  the thermostatic  stem  past  the  seating sleeve  contact 3. Two  complete  turns  into  the thermostatic  stem  past  the  poppet valve  seating  position 4. One  complete  turn  into  the thermostatic  stem  past  the  poppet valve  seating  position 4-16. If  the  desired  temperature  of  the  water in  a  diesel  engine  cooling  system  is 160°F,  a  properly  adjusted  temperature regulator  will  maintain  the  water  at  a temperature   between 1. 150° and 160°F 2. 150° and 170°F 3. 160°  and  170°F 4. 160°  and  18O°F Learning Objective: Recognize the purpose  and  types  of  heat  exchangers; indicate  what  factors  affect  their operation;  and  point  out  the  methods  of maintenance  and  repair. 4-17. In  a  marine  cooling  system  installation, which  of  the  following  engine  coolants may  be  circulated  through  a  heat exchanger? 1. Oil 2. Freshwater 3. Saltwater 4. Both 2 and 3 above 23