Session 3: Tuning of Fuel System of an Engine
Unit 5: Regular Maintenance of an Engine
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. ………….. is the adjustment or modification of the internal combustion engine.
Ans: Tuning
2. Warm up the …………… and turn the idle speed screw in thedirection to increase the engine’s RPM.
Ans: engine
3. Use ……………. to read RPM.
Ans: tachometer
4. Injector or nozzle is used in a (an)…………….
Ans: diesel engine
B. Multiple choice questions
1. ……………. is the adjustment or modification of the internal combustion engine.
(a) Tuning
(b) Fuel system
(c) Ignition system
(d) Cooling system
Ans: (a) Tuning
2. Which of these is a step for fuel tuning?
(a) Clean the air cleaner and fuel filter regularly
(b) Remove the tank cap
(c) Inspect the rubber washer
(d) All of the above
Ans: (a) Clean the air cleaner and fuel filter regularly
3. Which of these is a step of the nozzle pressure test?
(a) Remove the injector or nozzle from an engine
(b) Hold the container and lower the injector or nozzle
(c) Join the fuel pipe to the nozzle and start the engine
(d) All of the above
Ans: (d) All of the above
C. Answer the following questions
1. Why is tuning necessary?
Ans: Tuning is necessary to ensure smooth engine operation, proper fuel combustion, better fuel efficiency, reduced emissions, and improved engineperformance.
2. What are the steps to be followed while tuning the fuel system?
Ans: Clean the air cleaner and fuel filter. Check fuel lines for leakage. Inspect injectors or nozzles for proper spray. Adjust idle speed and fuel supplyas per manufacturer’s specification.
3. What are the advantages of tuning?
Ans: Tuning improves engine efficiency, increases mileage, reduces fuel consumption, ensures smooth running, and increases the life of enginecomponents.
