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

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?

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?

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?

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

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

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?

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?

Why is a tap turned backward after turning forward when cutting a thread?

What is one of the trade names for a replacement thread insert?

The lip of an oil seal faces _____ from the oil.

Technician A says that drill sizes are classified by letters. Technician B says that drill sizes are classified by numbers. Who is right?

Technician A says that using a thread lubricant results in more bolt stretch. Technician B says that a grade 8 bolt has eight radial lines on its head. Who is right?

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?

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?

A heli-coil is a thread repair device.

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

Refer to a bolt torque chart. What is the pro-per torque for a grade 5, 3⁄8" bolt with SAE 10 lubricant?

ISO flares and SAE double flares are interchangeable.

Technician A says that the 20 in 1⁄4 x 20 signifies the total number of threads the fastener has. Technician B says that the 1⁄4 signifies the socket size of the fastener head. Who is right?

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