Exam 4: Fasteners and Measurements

Name two different types of micrometers.

What two types of dial indicators can be used to measure rotor runout?

Spark plug gaps are measured with a round feeler gauge

Two technicians are speaking about helicoils. Technician A says helicoils can be threaded into a properly prepared hole to repair damaged threads. Technician B says helicoils can be used to make external threads on a shaft or rod. Who is correct?

Runout is measured with a(n) _____.

Pressure gauges always read less than 10 lbs per square inch.

Speed sensors use a toothed ring to trigger the sensor.

What statement is true concerning engine vacuum?

What tool is used to measure spark plug gap?

What tool is used to measure shaft endplay?

Two technicians are discussing air gap measurements. Technician A says that non-magnetic feeler gauges should never be used. Technician B says that measurements should be made with a tooth of the ring aligned with the center of the sensor. Who is correct?

What can vacuum readings from an operating engine tell us?

Two technicians are discussing measuring bores with inside micrometers. Technician A says that extension spindles allow the measurement of cylinder bores. Technician B says that once the micrometer is inserted into the bore and extended, it should be tightened and removed. Who is correct?

What tool is used to measure runout on a brake rotor?

Washers help to distribute the clamping load on a part.

Two technicians are discussing brake rotor thickness. Technician A says that rotors must be removed to measure thickness. Technician B says that rotors can be measured on or off the vehicle. Who is correct?

Two technicians are discussing U.S. thread sizes. Technician A says fastener threads can be fine or coarse. Technician B says that fine threads provide greater holding strength in soft materials. Who is correct?

Two technicians are discussing snaprings. Technician A says that snaprings are made from high-quality aluminum. Technician B says that snaprings may be internal or external. Who is correct?

Two technicians are discussing measuring pressure in an automobile. Technician A says that fuel, oil, automatic transmission, and brake pressure can be measured. Technician B says that the pressure gauge must read in hundreds of pounds of pressure. Who is correct?

Briefly describe problems resulting from undertightening and overtightening threaded fasteners.