Question 1

Technician A says that nonretorque head gaskets do not compress so they maintain all of the original clamping force. Technician B says that a microinch is one millionth of an inch. Who is right?

Accepted Answer

Technician B is correct because a microinch indeed is one millionth of an inch, which is a standard unit of measurement in precision engineering. Technician A is incorrect because nonretorque head gaskets do compress and may lose some clamping force over time, which is why they are designed not to require retorquing after installation.

Question 2

Technician A says that sealers are used with all gaskets but paper ones. Technician B says that a broken exhaust manifold bolt can result in a burned exhaust valve. Who is right?

Accepted Answer

Technician B is correct because a broken exhaust manifold bolt can lead to an exhaust leak at the cylinder head, which might cause hot exhaust gases to improperly escape, potentially leading to a burned exhaust valve due to the increased heat and improper sealing. Technician A is incorrect because sealers are not necessarily used with all types of gaskets; the use of sealers depends on the specific application and type of gasket.

Question 3

Technician A says that blue anaerobic thread locking compound is used when parts might be disassembled again. Technician B says that using some types of RTV for engine sealing can damage an oxygen sensor. Who is right?

Accepted Answer

Technician A is correct because blue anaerobic thread locking compound is designed for applications where the parts may need to be disassembled in the future, as it provides a medium strength bond. Technician B is correct because certain types of RTV (Room Temperature Vulcanizing) silicone sealants can release acetic acid during curing, which can potentially damage sensitive components like oxygen sensors.

Question 4

The torque specification for a valve cover gasket is 5 foot-pounds. Which of the following is the best procedure?

Accepted Answer

Since the torque specification is given in foot-pounds, using an inch-pound torque wrench requires conversion. Therefore, option D is the best choice as it provides the required torque value of 5 foot-pounds by using an inch-pound torque wrench and torquing to 60 inch-pounds, which is equivalent to 5 foot-pounds.

Question 5

Technician A says that head gaskets have small metering holes to direct coolant flow. Technician B says that occasionally one manufacturer's engine might use different head gaskets for different model years. Who is right?

Accepted Answer

Technician A is correct because head gaskets often have small metering holes to direct coolant flow. Technician B is also correct because it is possible for one manufacturer to use different head gaskets for different model years, depending on changes to the engine design.

Quiz 15: Engine Hardware: Fasteners, Thread Repair, and Gaskets

Technician A says that nonretorque head gaskets do not compress so they maintain all of the original clamping force. Technician B says that a microinch is one millionth of an inch. Who is right?

Technician A says that sealers are used with all gaskets but paper ones. Technician B says that a broken exhaust manifold bolt can result in a burned exhaust valve. Who is right?

Technician A says that blue anaerobic thread locking compound is used when parts might be disassembled again. Technician B says that using some types of RTV for engine sealing can damage an oxygen sensor. Who is right?

The torque specification for a valve cover gasket is 5 foot-pounds. Which of the following is the best procedure?

Technician A says that head gaskets have small metering holes to direct coolant flow. Technician B says that occasionally one manufacturer's engine might use different head gaskets for different model years. Who is right?