089024RR

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Exam Number: 089024RR
Question 1 of 20 : Select the best answer for the question.
1. The outside diameter of a valve stem must be smaller than the inside diameter of the valve guide into which it is to fit. Usually, how much smaller should the valve stem be?
A. 0.001 inch to 0.002 inch
B. 0.05 inch to 0.1 inch
C. 0.002 inch to 0.004 inch
D. 0.01 inch to 0.02 inch
Question 2 of 20 : Select the best answer for the question.
2. Cooling a valve assembly’s seat insert by placing it in a freezer will
A. reveal any signs of damage on the surface of the valve seat.
B. make it easier to take apart the assembly.
C. enlarge the insert.
D. make it easier to install the insert.
Question 3 of 20 : Select the best answer for the question.
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FIGURE A-2
3. In Figure A-2, a technician is performing a rebuilding procedure. What is the technician doing?
A. Grinding a valve seat
B. Checking the valve guide wear
C. Reaming a valve guide
D. Mating the valve face to the valve seat
Question 4 of 20 : Select the best answer for the question.
4. Generally, the maximum amount of warping allowed at any point along the surface of a small engine’s cylinder head is
A. 0.03 inch.
B. 0.1 inch.
C. 0.003 inch.
D. 0.01 inch.
Question 5 of 20 : Select the best answer for the question.
5. Valve seats are vital to an engine’s correct operation for two reasons. First, they provide the sealing surface for each valve. Second, they help
A. seat in the valve stems.
B. keep the valves cool.
C. provide lubrication for the valve guides.
D. compensate for badly adjusted valve timing.
Question 6 of 20 : Select the best answer for the question.
6. A _______ is a special tool that’s used to enlarge the hole within a valve guide.
A. drill bit
B. puller
C. reamer
D. lapping stick
Question 7 of 20 : Select the best answer for the question.
7. The slanted area of a valve that mates with the valve seat is called the
A. seat width.
B. margin width.
C. valve face.
D. stem diameter.
Question 8 of 20 : Select the best answer for the question.
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FIGURE A-1
8. A valve is illustrated in Figure A-1. The letter X points to the valve
A. stem.
B. margin.
C. face.
D. seat.
Question 9 of 20 : Select the best answer for the question.
9. If a valve seat is too wide, you can remove some metal from the bottom edge of the valve seat. To do this, you should use a grinding tool with which of the following cutting angles?
A. 45 degrees
B. 70 degrees
C. 90 degrees
D. 15 degrees
Question 10 of 20 : Select the best answer for the question.
10. For most small gasoline engines, the minimum width allowed for the valve seat is approximately
A. 3/16 inch to 1/4 inch.
B. 1/32 inch to 3/64 inch.
C. 1/4 inch to 1/2 inch.
D. 1/64 inch to 3/32 inch.
Question 11 of 20 : Select the best answer for the question.
11. The valve clearance in an engine is usually checked with the
A. engine running.
B. valves removed from the engine.
C. cylinder at the TDC position.
D. cylinder at the BDC position.
Question 12 of 20 : Select the best answer for the question.
12. The piston clearance is a measure of the difference between the
A. width of the piston ring width and the width of the piston groove.
B. piston ring side clearance and the cylinder diameter.
C. cylinder diameter and the piston diameter.
D. piston height at TDC and the piston height at BDC.
Question 13 of 20 : Select the best answer for the question.
13. The mating of the valve face to the valve seat is commonly referred to as
A. burning.
B. pulling.
C. lapping.
D. reaming.
Question 14 of 20 : Select the best answer for the question.14. In an engine rebuilding process, blue dye is often used to check
A. valve seat condition.
B. piston clearance.
C. cylinder head warp.
D. valve clearance.
Question 15 of 20 : Select the best answer for the question.
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FIGURE A-4
Question 15 of 20 : Select the best answer for the question.
15. Which of the following rebuilding tools are illustrated in Figure A-4?
A. Valve guide drivers
B. Valve lapping tools
C. Valve insert pullers
D. Valve seat grinding tools and pilots
Question 16 of 20 : Select the best answer for the question.
16. If a valve seat is too wide, you can remove some metal from the upper edge of the valve seat. To do this, you should use a grinding tool with which of the following cutting angles?
A. 15 degrees
B. 45 degrees
C. 75 degrees
D. 65 degrees
Customer reply 24 Mar 2018
Question 17 of 20 : Select the best answer for the question.
17. If you discover that a valve is bent, you should
A. straighten the stem using a ball peen hammer and a new valve guide.
B. replace it with a new valve.
C. straighten the stem using a press.
D. reface the valve using a valve grinding machine.
Question 18 of 20 : Select the best answer for the question.
18. To help center the counterboring tool, a pilot is inserted
A. on the head of the valve.
B. in place of the wrist pin.
C. over the valve stem.
D. into the valve guide.
Question 19 of 20 : Select the best answer for the question.
FIGURE A-3—Use this illustration to help you answer Question 12. All the measurements are in inches.
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19. Figure A-3 shows a set of typical piston specifications from a small-engine service manual. Imagine that you’re rebuilding an engine. You measure the diameter of the piston at 2.9296 inches and the diameter of the wrist pin at 0.6248 inch. You also calculate the piston clearance to be 0.009 inch. You then check all your measurements against the manufacturer’s specifications shown in Figure A-3. Based on your comparison, which of the following statements would be correct?
A. None of the three dimensions are within specifications.
B. The piston diameter is within specifications, but the diameter of the wrist pin and the piston clearance aren’t within specifications.
C. All three dimensions are within specifications.
D. The piston clearance is within specifications, but the diameters of the piston and the wrist pin aren’t within specifications.
Question 20 of 20 : Select the best answer for the question.
20. After a valve seat is reconditioned, the valve stem may have to be shortened slightly because the
A. valve may sit lower in the valve seat.
B. piston clearance may need to be increased.
C. cylinder head may not be completely flat.
D. valve clearance must be reduced.