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Small gas engines > Chapter 3, Summary > Flashcards

Chapter 3, Summary Flashcards

1
Q

What kinds of conditions are fasteners that are used in assembly of small gasoline engines, exposed to?

A

Heating and
cooling,
cyclic loading,
tensile loads,
shear loads,
corrosion, and
vibration during engine operation.

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2
Q

When disassembling an engine, why is it vital to note the location of all parts, fasteners, and washers

A

so they can be replaced in proper location

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3
Q

Damaged fasteners should be repalaced with new ones.

A

Lightly rusted fasteners may be cleaned and examined for reuse.

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4
Q

[______] are threaded fasteners that hold parts together by squeezing them between the [____] head on one end and a nut on the other

A

Bolts

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5
Q

Q: Why is a lock washer often placed between the face of a nut and the part surface?

A

A: To prevent loosening caused by vibration.

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6
Q

Nuts vary in shape and size depending on what?

A

Their intended function.

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7
Q

The most common nuts are:

A

Plain hexagon nuts

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8
Q

Name 5 other types of nuts

A

wing nuts,
castle nuts,
acorn nuts,
jam nuts, and
various self locking nuts

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9
Q

Bolt terminology includes:

A

Major diameter,
head size,
length,
and thread pitch.

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10
Q

Bolt grades are related to :

A

The minimum tensile strength of the bolt.

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11
Q

Bolt heads are marked with symbols to identify what?

A

The grade of the bolt.

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12
Q

Thread types of signifigance for small gas engines are :

A

Unified National Coarse ( UNC)
Unified National Fine ( UNF)
Metric (M)

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13
Q

Threads of a bolt or screw must be the same as :

A

The mating thread in the hole or nut.

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14
Q

Threads are identified by what?

A

A thread designation.

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15
Q

2 examples of thread designatiins are:

A

1/2-13 UNC-2A For standard threads,
and M10 ×1.5×25 for metric threads.

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16
Q

How do screws hold parts together?

A

By passing through one part and threading into another.

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17
Q

Bolts, nuts and screws on engines should be tightened according to specifications, using what?

A

A torque wrench.

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18
Q

How can threads be repaired?

A

by chasing them with a threading tap for holes -or-
a threading die for bolts and screws

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19
Q

When tapping new threads, how di you determine the proper size of the hole to be drilled?

A

From a tap drill chart.

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20
Q

Flat washers are used to do what?

A

Provide a bearing surface for bolt and screw heads and nuts.

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21
Q

Various types of lock washers do what?

A

Prevent loosening of bolts and screws

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22
Q

What type of pins are used to secure castle nuts and clevis pins?

A

Cotter pins

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23
Q

[—-] and [—-] are used for alignment of parts and should fit quite snugly.

A

Dowel pins and straight pins

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24
Q

How are grooved pins placed into what kind of holes?

A

They are driven into interference fit holes.

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25
Q

The [—–] are cut into the walss of the hole to secure the pin.

A

Grooves

26
Q

what pins have a taper along their entire length.

A

Taper Pins

27
Q

Taper pins are used for what purpose?

A

Fastening pulleys and gears to shafts to prevent slipping around the shaft.

28
Q

[———-] are circular spring steel fasteners that fit into a groove around a shaft or in a hole.

A

Retaining rings

29
Q

What kind of tool is used to install and remove retaining rings?

A

A special plier-like tool

30
Q

[—-] are used on shafts that havd a gear, pulley or sleeve that fits and rotates with the shaft

A

Keys

31
Q

Keys rest in what ?

A

the keyseat, and keyway.

32
Q

Many types of [—-] and [—-] are used on engines and implements.

A

Adhesives and sealants.

33
Q

Thread locking compounds are used for what purpose?

A

Preventing threaded fasteners from loosening due to vibration.

34
Q

Some [—————] are used to prevent leakage between parts.

A

Liquid sealants.

35
Q

What is important to do when using liquid sealants?

A

Use the correct onr as specified by the manufacturer.

36
Q

What are Antiseize compounds ?

A

Lubricants that prevent parts from locking together.

37
Q

What are used to seal between engine parts to prevent leakage of engine oil, coolant, compression, and vacuum?

A

Gaskets

38
Q

What is important to consider when replacing a gasket?

A

Selecting the cirrect material, shape, and thickness.

39
Q

The unthreaded part of a bolt or screw is called the:

A

Shank

40
Q

The helical portion of a bolt or screw is called the:

A

Thread

41
Q

A type of hardened screw that makes its own threads, usually found in sheet metal, is a[——] screw

A

Self tapping

42
Q

(?)The term bolt implies the use of a [—–]

A

Nut?

43
Q

Jam nuts are usually used with [—-] nuts.

A

Hexagon

44
Q

The proper thread notation fir a 14 millimeter thread with a 1.5 millimeter pitch on a screw that is 40 millimeters long is[——————-]

A

[B] M-14 × 1.5 × 40

45
Q

The proccess of cutting new threads into a hole is called :

A

A: Tapping

46
Q

T or F: For cutting threads in a through hole, the proper tap to use would be a taper tap?

A

True

47
Q

The cutting tool used to cut external tgreads is called A:

A

Die / inside a die stock handle.

48
Q

To provide a wider bearing surface for a bolt head or nut, a [——] washer should be used.

A

Flat

49
Q

(?) [True or False]
If a 1/8” rolled pin is to be used in a shaft, the correct drill size to use for drilling the hole for this pin should be 3/16” diameter.

A

[?] False

50
Q

What type of fasteners are used to lock castle nuts?

A

A: Cotter pins

51
Q

[True or False] Retaining rings are made of spring steel.

A

True

52
Q

[———-] can be applied to the threads of nuts, bolts, or screws to prevent them from loosening during service.

A

B: Thread adhesive

53
Q

Gaskets are used between engine parts to seal and prevent leakage of all the following except:[—–]

A

D: Sealant

54
Q

How do you use a screw extractor to remove a fastener that has broken off below the surface it is threaded into:

A

Drill a hole approximately one half of the broken fasteners diameter at top center of it. Then tap the extractor into the hole using a hammer; The spirals on the extractor cause it to wedge tightly into the broken fastener. Use a wrench or socket to grip the extractor and back the broken fastener out if the hole.

55
Q

If a hole goes all the way through it is called:

A

A through hole.

56
Q

Holes that do not go all the way through the matrerial are called:

A

Blind holes

57
Q

Answer the folowing questions about the thread notation given below:
A: 3/8-16 UNC 1A

A

B: The major diameter of the thread is: (3/8”)
C: How many threads per lineal inch are there?: (16)
D: Is the thread coarse or fine?: (Coarse)
E: Is the thread internal or external?:(External)
F: Is the thread a Loose, average, or close fit? ( Loose)

58
Q

When tightening bolts on an engine head, why is it important to use a crisscross pattern unless a different pattern is specified by the manufacturer?

A

This procedure produces even gasket compression and sealing, and prevents possible warping of parts.

59
Q

When reassembling an engine, it is recommended that cotter pins be replaced rather than reused. Why should you never reuse a cotter pin?

A

Because it will have weakened from being bent, and might possibly break.

60
Q

Form- in - place sealants can be used in place of coventional gaskets. What are the advantages and disadvantages of using a sealant instead of a conventional gasket?

A

Advantages: lessens need to stock various sizes and shapes of gaskets.Increases seal strength. Improved reliabilty. Reduced cost, easier application.

Disadvantages: Anerobic sealants not good for high heat applications above 200°C.
Silicone sealants can have Poor resistance to fuel and aromatic solvents. Not recommended for high pressure applications.

61
Q

UNC

A

Unified National Coarse

62
Q

UNF

A

Unified National Fine

Small gas engines (7 decks)

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