Automotive Shop Terminology; Unit Summary; QUIZ

TERMINOLOGY

Ball gauge Blowgun Bolt diameter Bolt head Bolt shank Chisel Compact disc-read-only memory (CD-ROM) Dial caliper Dial indicator Die Extractor Feeler gauge Fillet Foot pads Grade marks Impact wrench Machinist's rule Micrometer Phillips screwdriver Pliers Pozidriv screwdriver Press fit Punch Snap gauge Spark plug thread tap Straightedge Tap Telescoping gauge Thread pitch Thread pitch gauge Torque wrench Torx screwdriver Trouble light Vernier caliper Wrench

UNIT SUMMARY

¦ Repairing the modern automobile requires the use of many different hand and power tools. Units of measurement play a major role in tool selection.

Therefore, it’s important to be knowledgeable about the Imperial and the metric systems of measurement.

¦ Measuring tools must be able to measure objects to a high degree of precision. They should be handled with care at all times and cleaned before and after every use.

¦ A micrometer can be used to measure the outside diameter of shafts and the inside diameter of holes. It’s calibrated in either inch or metric graduations.

¦ Telescoping gauges are designed to measure bore diameters and other clearances. They usually are used with an outside micrometer. Small hole gauges are used in the same manner as the telescoping gauge, usually to determine valve guide diameter.

¦ The screw pitch gauge provides a fast and accurate method of measuring the threads per inch (pitch) of fasteners. This is done by matching the teeth of the gauge with the fastener threads and reading the pitch directly from the leaf of the gauge.

¦ It’s crucial to use the proper amount of torque when tightening nuts or cap screws on any part of a vehicle, particularly the engine. A torque-indicating wrench makes it possible to duplicate the conditions of tightness and stress recommended by the manufacturer.

¦ Metric and SAE size wrenches are not interchange able. An auto Tech. should have a variety of both types.

¦ A screwdriver, no matter what type, should never be used as a chisel, punch, or pry bar.

¦ The hand tap is used for hand cutting internal threads and for cleaning and restoring previously cut threads. Hand-threading dies cut external threads and fit into holders called die stocks.

¦ Carelessness or mishandling of power tools can cause serious injury. Safety measures are needed when working with such tools as impact and air ratchet wrenches, blowguns, bench grinders, lifts, hoists, and hydraulic presses.

¦ The primary source of repair and specification information for any vehicle is the manufacturer's service manual. Updates are published as service bulletins and include changes made during the model year, which won’t appear in the manual until the following year.

¦ Flat-rate manuals are ideal for making cost estimates. Published by manufacturers and independent companies, they contain figures showing how long specific repairs should take to complete, as well as a list of the necessary parts and their prices.

EXAM

1. How often should the calibration of a micrometer be checked?

2. List some common uses of the dial indicator.

3. Wrenches are marked with their size. What does the size represent?

4. True or False? The same information available in service manuals and bulletins is also available electronically: on compact disks (CD-ROMs), digital video disks (DVDs), and the Internet.

5. How do manufacturers inform Tech.s about changes in vehicle specifications and repair procedures during the model year?

6. Which of the following wrenches is the best choice for turning a bolt?

a. open-end c. combination

b. box-end d. none of the above

7. Tech. A says that a vernier caliper can be used to measure the outside diameter of some thing. Tech. B says that a vernier caliper can be used to measure the inside diameter of a bore. Who’s right?

a. Tech. A; c. Both A and B

b. Tech. B; d. Neither A nor B

8. Tech. A says that a tap cuts external threads. Tech. B says that a die cuts internal threads. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

9. Which of the following screwdrivers is like a Phillips but has a flatter and blunter tip?

a. standard

b. Torx

c. Pozidriv

d. clutch head

10. Which of the following types of pliers is best for grasping small parts?

a. adjustable c. retaining ring

b. needle nose d. snap-ring

11. Tech. A uses a punch to align holes in parts during assembly. Tech. B uses a punch to drive out rivets. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

12. An extractor is used for removing broken .

a. seals c. pistons

b. bushings d. bolts

13. Which of the following statements about items that are press fit is not true?

a. Many precision gears and bearings have a slight interference fit when installed on a shaft or housing.

b. The press fit allows slight motion between the parts and therefore prevents wear.

c. The removal of gears and bearings that are press fit must be done carefully to avoid breaking or binding the parts.

d. A puller with the proper jaws and adapters should be used when applying force to remove press-fit gears and bearings.

14. Tech. A uses a blowgun to blow off parts during cleaning. Tech. B uses a blowgun to clean off his uniform after working. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

15. Tech. A says that flare nut or line wrenches should be used to loosen or tighten brake line or tubing fittings. Tech. B says that open-end wrenches will surround the fitting's nut and pro vide a positive grip on the fitting. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

16. Tech. A uses a dial caliper to take inside and outside measurements. Tech. B uses a dial caliper to take depth measurements. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

17. For a measurement that must be made within one ten-thousandth of an inch, Tech. A uses a machinist's rule. For the same accuracy, Tech. B uses a standard micrometer. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

18. Tech. A says that portable floor jacks are operated by hydraulics. Tech. B says that portable floor jacks may be operated by com pressed air. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

19. When using an air impact wrench, Tech. A uses impact sockets and adapters. Tech. B uses chrome-plated sockets. Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

20. While discussing thread sealants and lubricants: Tech. A says that antiseize compound is used where a bolt might become difficult to remove after a period of time. Tech. B says that thread sealants are used on bolts that are tightened into an oil cavity or coolant passage.

Who’s right?

a. Tech. A c. Both A and B

b. Tech. B d. Neither A nor B

21. The metric equivalent to 10 miles is ...

a. 0.06895 bar c. 1.6093 kilometers

b. 10.6895 bars d. 16.093 kilometers

22. True or False? A metric bolt with the marking of 8.9 has more yield strength than a bolt marked 10.5.

23. List the steps that should be followed to precisely tighten a bolt to specifications.

24. Which of the following thread designs typically has tapered threads to provide for sealing at a joint?

a. UNC c. UNF

b. NPT d. UNEF

25. Which of the following is not measured with a feeler gauge set?

a. piston ring side clearance

b. flywheel runout

c. crankshaft end play

d. spark plug gap

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