Question 1

Drill bits for iron and steel are properly ground to a _____ degree angle.

Accepted Answer

59

Question 2

Technician A says one wrench is sufficient when loosening a flare-nut. Technician B says embossed steel gaskets should be installed with the embossed side toward the block. Who is right?

Accepted Answer

Technician A is incorrect because when loosening a flare-nut, two wrenches are often recommended to prevent damage to the fitting. Technician B is incorrect because embossed steel gaskets should be installed according to the manufacturer's specifications, which does not always mean the embossed side toward the block.

Question 3

To anneal a metal, it is heated and cooled rapidly.

Accepted Answer

Annealing involves heating a metal to a specific temperature and then cooling it slowly, usually in a furnace, to make it more ductile and reduce its hardness.

Question 4

The recommended drill speed for 1/4" mild steel is 750 rpm.

Accepted Answer

The recommended drill speed for 1/4" mild steel is typically around 3000 rpm when using a high-speed steel (HSS) drill bit. However, this can vary based on the specific drill bit type and the machinery being used.

Question 5

All of the following are types of thread inserts used in engine repairs, EXCEPT _____.

Accepted Answer

Smartsert is not a recognized type of thread insert used in engine repairs. Solid, Keensert, and heli-coil are all established types of thread inserts.

Question 6

During warranty repairs for rear main seal oil leaks, some manufacturers use ____ rear main oil seals.

Accepted Answer

The answer of During warranty repairs for rear main seal...

Question 7

A heli-coil is a thread repair device.

Accepted Answer

A heli-coil is used to repair stripped or damaged threads, creating a stronger thread in the original material.

Question 8

ISO flares and SAE double flares are interchangeable.

Accepted Answer

ISO flares and SAE double flares are not interchangeable because they have different angles and applications, with ISO flares typically being 90 degrees and used in European/Asian vehicles, and SAE double flares being 45 degrees and commonly used in American vehicles.

Question 9

Technician A says the click-type torque wrench is best because it is the most accurate. Technician B says that an inch-pound torque wrench should be used when measuring smaller torque values. Who is correct?

Accepted Answer

Technician B is correct because an inch-pound torque wrench is indeed used for smaller torque values, offering the precision needed for delicate applications. Technician A's statement about the click-type torque wrench being the best due to its accuracy is subjective and not necessarily true, as accuracy depends on the calibration and use of the wrench, not the type.

Question 10

Why should silicone application be avoided around fuel and automatic transmission fluid?

Accepted Answer

The answer of Why should silicone application be avoided around...

Question 11

Technician A says chevron seals are used at the front and rear of the crankcase. Technician B says dynamic seals are used to seal moving parts. Who is right?

Accepted Answer

Chevron seals are used at the front and rear of the crankcase, while dynamic seals are used to seal moving parts.

Question 12

Technician A says multi-layered steel gaskets have from eight to ten layers. Technician B says when drilling steel, you use a cutting oil. Who is right?

Accepted Answer

Technician B is correct because using cutting oil when drilling steel helps to cool and lubricate the drill bit, making the drilling process easier and prolonging the life of the drill bit. Multi-layered steel gaskets typically do not have as many as eight to ten layers; they usually have fewer layers.

Question 13

The maximum stress a material can withstand and still be able to return to its original form without damage is known as ____.

Accepted Answer

The answer of The maximum stress a material can withstand...

Question 14

Technician A says that a harmonic balancer repair sleeve kit will repair a worn damper hub at minimal cost. Technician B says this type sleeve is pressed onto the hub using a small amount of silicone sealer. Who is correct?

Accepted Answer

The answer of Technician A says that a harmonic balancer...

Question 15

Used only on precision machine parts, a(n) ____ sealer hardens in the absence of air.

Accepted Answer

The answer of Used only on precision machine parts, a(n)...

Question 16

Technician A says recommendations specify valve cover gaskets be tightened to 5 to 15 foot-pounds. Technician B says many gaskets used in the automotive industry are directional. Who is correct?

Accepted Answer

Technician A is correct because valve cover gaskets often have a specified torque range to ensure a proper seal without damaging the gasket or valve cover, and 5 to 15 foot-pounds is a common specification for many engines. Technician B is also correct because many gaskets, including some valve cover gaskets, are designed to be installed in a specific orientation or direction to ensure proper sealing and function.

Question 17

Technician A says spark plugs that have tapered seats require no gasket. Technician B says spark plugs that have flat seats require gaskets. Who is correct?

Accepted Answer

Both technicians are correct. Spark plugs with tapered seats are designed to seal directly against the cylinder head, eliminating the need for a gasket. Spark plugs with flat seats require gaskets to ensure a proper seal.

Question 18

Technician A says copper head gaskets are available for use in corrosive environments. Technician B says Teflon coated gaskets require the use of gasket sealer. Who is right?

Accepted Answer

Copper head gaskets are indeed used in various applications, including those involving corrosive environments, due to their excellent conductivity and resistance to corrosion. Teflon coated gaskets, on the other hand, are designed to create a reliable seal without the need for additional sealers, making Technician B's statement incorrect.

Question 19

Standard inch bolts have lines on the heads to identify the grade.

Accepted Answer

The number of lines on the head of a standard inch bolt indicates the bolt's grade, which corresponds to its material strength and intended use.

Question 20

Technician A says some manufacturers recommend head bolts going into a coolant passage be sealed with liquid thread sealant. Technician B says RTV stands for right torque value. Who is correct?

Accepted Answer

Technician A is correct because manufacturers do indeed recommend using liquid thread sealant on head bolts that go into coolant passages to prevent coolant leaks. Technician B is incorrect because RTV stands for Room Temperature Vulcanizing, which is a type of silicone sealant, not "right torque value."

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