chapter 2 tools and measuring instruments
name
12. identify the parts of the machinist’s vise in the following illustration.
image of machinist’s vise with labels a, b, c, d
12. a. ______
b. ______
c. ______
d. ______
13. if a flywheel holder is not available, a(n) ______ can be used to hold the flywheel while the flywheel nut is removed.
14. on a severely worn engine, a(n) ______ may need to be used to shave the top portion of the cylinder before the piston can be removed.
15. a ring spreader must be used to install new rings because ______.
a. the rings are under so much tension they cannot be spread by hand
b. the ring spreader cuts the ring groove so the rings will fit better
c. the rings may become distorted if they are installed by hand
d. none of the above.
16. a ring compressor is used to ______.
a. compress the rings so they will not catch on the wear ridge when the piston is removed
b. reshape distorted rings so they can be reused
c. clean carbon out of the ring grooves so the rings seat properly
d. none of the above.
17. true or false? a glaze breaker is used to remove cylinder taper during an engine rebuild.
18. ______ are test instruments used to measure engine speed.
19. a spark tester must be connected between the spark plug wire and a(n) ______ part of the engine.
20. a compression tester measures the ______.
a. distance traveled by the piston
b. maximum air pressure created in the cylinder
c. amount of valve lift
d. none of the above.
small gas engines workbook 13

Question

chapter 2 tools and measuring instruments
name
12. identify the parts of the machinist’s vise in the following illustration.
image of machinist’s vise with labels a, b, c, d
12. a. ______
    b. ______
    c. ______
    d. ______
13. if a flywheel holder is not available, a(n) ______ can be used to hold the flywheel while the flywheel nut is removed.
14. on a severely worn engine, a(n) ______ may need to be used to shave the top portion of the cylinder before the piston can be removed.
15. a ring spreader must be used to install new rings because ______.
    a. the rings are under so much tension they cannot be spread by hand
    b. the ring spreader cuts the ring groove so the rings will fit better
    c. the rings may become distorted if they are installed by hand
    d. none of the above.
16. a ring compressor is used to ______.
    a. compress the rings so they will not catch on the wear ridge when the piston is removed
    b. reshape distorted rings so they can be reused
    c. clean carbon out of the ring grooves so the rings seat properly
    d. none of the above.
17. true or false? a glaze breaker is used to remove cylinder taper during an engine rebuild.
18. ______ are test instruments used to measure engine speed.
19. a spark tester must be connected between the spark plug wire and a(n) ______ part of the engine.
20. a compression tester measures the ______.
    a. distance traveled by the piston
    b. maximum air pressure created in the cylinder
    c. amount of valve lift
    d. none of the above.
small gas engines workbook 13

Accepted Answer

### Question 13
# Brief Explanations:
When a flywheel holder isn't available, a strap wrench (or sometimes a suitable alternative like a large adjustable wrench or a block of wood with a wrench, but commonly a strap wrench) can be used to hold the flywheel while removing the nut. The key is that a tool that can grip the flywheel without damaging it and provide enough torque resistance is needed, and a strap wrench is a common choice here.
# Answer:
strap wrench (or other appropriate tool like a large adjustable wrench used with care, but strap wrench is the typical answer for this context)

### Question 14
# Brief Explanations:
On a severely worn engine, the cylinder may have a wear ridge at the top. To remove the piston, this ridge needs to be shaved off, and a ridge reamer (or cylinder ridge reamer) is the tool used for this purpose. It's designed to cut the hard, worn ridge from the top of the cylinder bore.
# Answer:
ridge reamer (or cylinder ridge reamer)

### Question 15
# Brief Explanations:
- Option A: Piston rings have tension, but they can be spread by hand (though carefully), so A is incorrect.
- Option B: A ring spreader doesn't cut the ring groove; it's for spreading rings during installation, so B is incorrect.
- Option C: If rings are installed by hand, they can become distorted (bent or twisted) which affects their sealing ability. A ring spreader ensures they are spread evenly and without distortion. So C is correct.
- Option D: Since C is correct, D is incorrect.
# Answer:
C. the rings may become distorted if they are installed by hand

### Question 16
# Brief Explanations:
- Option A: A ring compressor is used when installing the piston (with rings) into the cylinder. It compresses the rings so they don't catch on the wear ridge (or the cylinder wall) during installation, not removal. Wait, correction: Wait, actually, when removing the piston, a ring compressor isn't used. Wait, no, the question is about what a ring compressor is used for. Wait, no, let's re - check. A ring compressor is used to compress the piston rings so that the piston (with rings) can be inserted into the cylinder without the rings catching on the cylinder wall (including the wear ridge if present during installation). But in the options, option A says "when the piston is removed" which is incorrect. Wait, maybe I made a mistake. Wait, no, let's re - evaluate the options:
- Option A: If it's about removal, no. But maybe the option has a typo, or I misremember. Wait, no, the correct function of a ring compressor is to compress the rings for piston installation (so that the rings fit into the cylinder bore without catching). But among the options, option A is the closest in terms of the idea of preventing catching, even if the context of removal is a bit off. Wait, no, actually, when removing the piston, you might use a ring expander or just be careful, but a ring compressor is for installation. Wait, maybe the question's option A has a mistake, but let's check the other options:
- Option B: A ring compressor doesn't reshape distorted rings; that's not its function.
- Option C: A ring compressor doesn't clean carbon from ring grooves.
- Option D: Since none of B and C are correct, and A is the only one related to ring compression (even if the piston action is mis - stated as removal, maybe it's a wording error), but actually, the correct answer should be A (assuming the question meant installation, but the option says removal). Alternatively, maybe the question is correct, and I'm wrong. Wait, no, let's think again. When removing the piston, the rings are already in the cylinder. To remove the piston, you might need to compress the rings? No, usually, you just pull the piston out, but if there's a wear ridge, the rings might be caught. So a ring compressor (or a similar tool) could be used to compress the rings so they don't catch on the wear ridge during removal. So option A is correct.
# Answer:
A. compress the rings so they will not catch on the wear ridge when the piston is removed

### Question 17
# Brief Explanations:
A glaze breaker is used to remove the glaze (the hard, smooth layer) from the cylinder walls, not to remove cylinder taper. Cylinder taper is measured and corrected by other means (like honing or boring). So the statement is False.
# Answer:
False

### Question 18
# Brief Explanations:
Tachometers (or tach - dwell meters, but primarily tachometers) are test instruments used to measure engine speed (in revolutions per minute, RPM). They can be mechanical or electronic and are designed to detect the rotational speed of the engine.
# Answer:
Tachometers (or Tach - Dwell Meters, but Tachometers is the most common answer)

### Question 19
# Brief Explanations:
A spark tester must be connected between the spark plug wire and a grounded part of the engine. The engine block (which is grounded) is a common grounded part. This allows the spark to jump across the tester's gap, and the grounded part provides a path for the electrical current, so we can test if the spark plug is producing a spark.
# Answer:
grounded (or engine block, which is a grounded part)

### Question 20
# Brief Explanations:
- Option A: A compression tester doesn't measure the distance traveled by the piston; that's related to stroke length, measured by other means.
- Option B: A compression tester is used to measure the maximum air pressure created in the cylinder during the compression stroke. This helps in diagnosing engine problems like worn rings, valves, or head gaskets.
- Option C: A compression tester doesn't measure the amount of valve lift; that's measured by a valve spring tester or a dial indicator.
- Option D: Since B is correct, D is incorrect.
# Answer:
B. maximum air pressure created in the cylinder

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