Quiz 13 - Engine Sealing And Reassembly

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  • 1/18 Questions

    Which of the following perform the vital task of sealing the engine?

    • Gaskets
    • Seals
    • O-rings
    • All of the above
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About This Quiz

This quiz covers essential aspects of engine sealing and reassembly, focusing on gaskets, bolt torque, and engine break-in procedures as per manufacturer guidelines.

Automotive Engineering Quizzes & Trivia

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  • 2. 

    Technician A says some seals are designed to keep oil from escaping around a rotating shaft. Technician B says some seals are used to prevent fluid leaks between two fairly rigid flanges. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    Both Technician A and Technician B are correct. Technician A is correct because some seals are indeed designed to keep oil from escaping around a rotating shaft. These seals are commonly known as shaft seals or oil seals and are used in various applications such as engines, gearboxes, and pumps. Technician B is also correct because some seals are used to prevent fluid leaks between two fairly rigid flanges. These types of seals are commonly referred to as gaskets and are used in applications where two flanges need to be sealed tightly to prevent fluid leakage, such as in pipelines and plumbing systems.

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  • 3. 

    A silicone RTV gasket can be used to replace conventional_____gaskets

    • Paper

    • Cork

    • Cork with rubber

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    A silicone RTV gasket can be used to replace conventional gaskets made of paper, cork, or cork with rubber. Silicone RTV gaskets are versatile and can be used as a substitute for different types of gaskets depending on the specific application requirements. They provide a reliable seal and are resistant to high temperatures, chemicals, and weathering. Therefore, they are a suitable alternative to traditional gasket materials like paper, cork, or cork with rubber.

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  • 4. 

    Technician A says damaged threads in a cylinder head can be repaired with a helically coiled insert. Technician B says stripped threads are commonly caused by over-torquing. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    Both Technician A and Technician B are correct. Technician A is correct because damaged threads in a cylinder head can indeed be repaired with a helically coiled insert. This insert, also known as a thread insert or a helicoil, can be used to restore the integrity of the damaged threads. Technician B is correct because stripped threads are commonly caused by over-torquing, which can lead to the threads being pulled or stripped from the cylinder head. Therefore, both technicians are correct in their statements.

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  • 5. 

    Technician A says two extremely smooth surfaces do not require gaskets or sealants when they are fastened together. Technician B always uses new gaskets and never reuses old ones. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. B only
    Explanation
    Technician B is correct. While Technician A's statement about smooth surfaces not requiring gaskets or sealants may be true in some cases, it is not always the case. Gaskets and sealants are used to ensure a proper seal between two surfaces, regardless of their smoothness. Technician B's practice of always using new gaskets and never reusing old ones is a good practice as gaskets can degrade over time and may not provide an effective seal if reused. Therefore, Technician B's approach is more reliable and recommended.

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  • 6. 

    Bolt torque is a function of:

    • Tension

    • Torsion

    • Friction

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Bolt torque is a measure of the rotational force applied to tighten a bolt. It is influenced by tension, which is the stretching force on the bolt, as well as torsion, which is the twisting force. Friction also plays a role in determining bolt torque, as it affects the resistance to rotation. Therefore, all three factors - tension, torsion, and friction - contribute to the overall bolt torque.

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  • 7. 

    A damaged bolt should be:

    • Repaired with a tap

    • Repaired with a die

    • Discarded

    • Both B and C

    Correct Answer
    A. Discarded
    Explanation
    A damaged bolt should be discarded because repairing it with a tap or a die may not fully restore its strength and integrity. A tap is used to repair damaged female threads, while a die is used to repair damaged male threads. However, if the bolt is significantly damaged or weakened, it is safer to discard it and replace it with a new one to ensure proper functionality and prevent potential failures or accidents.

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  • 8. 

    Torque-to-yield bolts are being discussed. Technician A says compared to conventional bolts, toque-to-yield bolts offer more uniform clamping force. Technician B says torque-to-yield bolts are tightened to a specific torque, and then rotated a certain number of degrees. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    Both Technician A and Technician B are correct. Torque-to-yield bolts are designed to provide a more uniform clamping force compared to conventional bolts. They are tightened to a specific torque and then rotated a certain number of degrees, which helps to achieve the desired clamping force. Therefore, both statements are accurate in describing the characteristics and installation process of torque-to-yield bolts.

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  • 9. 

    Graphite is a:

    • Natural lubricant

    • Synthetic lubricant

    • Natural sealant

    • Synthetic sealant

    Correct Answer
    A. Natural lubricant
    Explanation
    Graphite is a natural lubricant because it has a layered structure with weak bonds between the layers. This allows the layers to slide over each other easily, reducing friction and providing lubrication. Additionally, graphite has low reactivity and high thermal stability, making it an effective lubricant in high-temperature and high-pressure environments.

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  • 10. 

    Technician A uses soft gaskets on valve covers. Technician uses soft gaskets on water pumps. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    Both Technician A and Technician B are correct. Technician A is correct because using soft gaskets on valve covers can help create a tight seal and prevent oil leaks. Technician B is correct because using soft gaskets on water pumps can also help create a tight seal and prevent coolant leaks. By using soft gaskets on both valve covers and water pumps, both technicians are taking the necessary steps to ensure proper sealing and prevent leaks in the respective components.

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  • 11. 

    Which of the following statements is not correct?

    • All metals are elastic

    • Cut bolt threads are 30 percent stronger than rolled threads

    • Torque is a function of friction

    • Proper use of torque will avoid a yield condition

    Correct Answer
    A. Cut bolt threads are 30 percent stronger than rolled threads
    Explanation
    The statement "Cut bolt threads are 30 percent stronger than rolled threads" is not correct. In reality, rolled threads are generally stronger than cut threads. Rolled threads have a greater tensile strength and fatigue resistance due to the compressive forces applied during the rolling process, which helps to align the grain structure of the metal. Cut threads, on the other hand, can have uneven surfaces and may introduce stress concentrations, making them weaker compared to rolled threads.

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  • 12. 

    Techniocian A says aluminum expands at a different rate than cast iron. Technician B says cast iron has a coefficient of thermal expansion two or three times greater than aluminum. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. A only
    Explanation
    Technician A is correct. Aluminum and cast iron do have different rates of thermal expansion. Aluminum expands more than cast iron when heated. Technician B's statement about cast iron having a coefficient of thermal expansion two or three times greater than aluminum is incorrect.

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  • 13. 

    Which one of the following gaskets is not used on certain engines?

    • Valve cover gasket

    • Cylinder head gasket

    • Exhaust manifold gasket

    • Oil pan gasket

    Correct Answer
    A. Exhaust manifold gasket
    Explanation
    The exhaust manifold gasket is not used on certain engines because some engines do not have an exhaust manifold. The exhaust manifold is a component that collects exhaust gases from multiple cylinders and directs them into the exhaust system. Engines that do not have an exhaust manifold, such as some rotary engines or certain designs with integrated exhaust manifolds, do not require an exhaust manifold gasket.

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  • 14. 

    The proper engine break-in procedure is:

    • A test run at 30 mph

    • A test run at 10 mph and acceleration to 30 mph

    • A test run at highway speed

    • Best determined by the new car manufacturer

    Correct Answer
    A. Best determined by the new car manufacturer
    Explanation
    The proper engine break-in procedure is best determined by the new car manufacturer. This means that the manufacturer of the new car is the most reliable source of information when it comes to how to properly break in the engine. They have the knowledge and expertise to provide specific instructions that will ensure the engine's longevity and optimal performance. It is important to follow the manufacturer's guidelines to avoid any potential damage or issues with the engine.

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  • 15. 

    Technician A spray paints the engine assembly after it is completely assembled. Technician B puts grease on the exhaust and intake ports before painting the engine. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    Both Technician A and Technician B are correct. Technician A is correct because spray painting the engine assembly after it is completely assembled helps to protect it from corrosion and adds a finishing touch to the engine. Technician B is also correct because putting grease on the exhaust and intake ports before painting the engine helps to prevent the paint from sticking to these areas and allows for easier cleaning and maintenance in the future.

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  • 16. 

    Technician A uses adhesives to hold gaskets in place while installing them. Technician B use RTV when an anaerobic sealant is required. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. A only
    Explanation
    Technician A is correct because using adhesives to hold gaskets in place during installation is a common and effective practice. RTV (Room Temperature Vulcanizing) sealants are not typically used when an anaerobic sealant is required, as they have different properties and applications. Therefore, Technician B is not correct in this scenario.

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  • 17. 

    Proper engine break-in procedure is being discussed. Technician A says the engine should be run at idle speed for at least two hours. Technician B says the engine should be accelerated at full throttle to 50 mph. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Neither A nor B
    Explanation
    Neither Technician A nor Technician B is correct. The proper engine break-in procedure typically involves a combination of driving at varying speeds and loads to properly seat the piston rings and allow the engine components to wear in evenly. Running the engine at idle speed for two hours or accelerating at full throttle to 50 mph do not provide the necessary conditions for a proper break-in.

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  • 18. 

    Technician A uses chemical thread retainers on critical bolts and nuts. Technician B says chemical thread retainers cannot be used as a substitute for lock washers. Who is correct?

    • A only

    • B only

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. A only
    Explanation
    Technician A is correct. Chemical thread retainers are used on critical bolts and nuts to prevent them from loosening due to vibrations or other factors. They provide a strong and reliable hold, eliminating the need for lock washers. Therefore, chemical thread retainers can be used as a substitute for lock washers. Technician B is incorrect in stating that they cannot be used as a substitute.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 02, 2009
    Quiz Created by
    Ozzzmann
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