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Main Propulsion > ICE > Flashcards

ICE Flashcards

1
Q

In a four stroke gas engine where is the fuel air mixed?

A

Carburetor

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2
Q

The amount of fuel injected by a fuel system is determined by adjusting What?

A

fuel rack

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3
Q

Min cetane for MTU and PAXMAN?

A

45

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4
Q

In a 2 stroke how do exhaust gasses exit the cylinder?

A

through the cylinder wall

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5
Q

Shaft taper %?

A

80%

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6
Q

Keel coolers use what?

A

ANTIfreeze

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7
Q

What size cutters are required to carry lube oil viscosity comparators?

A

All cutters and boats that use 9000 & 2104 series lubricating oil

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8
Q

What does consistent lifting of a cylinder relief valve indicate?

A

Weakened spring, early fuel injection, faulty fuel injector

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9
Q

How to treat small burrs on a piston pin?

A

Replace it. Under no circumstances are pins to be cleaned with sandpaper or emery cloth per NSTM 233.5.11

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10
Q

what ensures oil is dispensed on oil bearing walls

A

oiler rings

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11
Q

A thrust bearing supports what type of movement?

A

axial

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12
Q

Engine sampling Jacket water

A

Monthly?

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13
Q

When crank deflection readings all read +(plus) the crank is said to be?

A

Convex Upwards

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14
Q

What type of engine has a wet type oil sump?

A

4 stroke

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15
Q

If a full load is applied to an engine with new rings or liners what should happen?

A

too much load-galling pistons, scoring liners or piston seizure
To little- cylinder surface will glaze and wear, rings will cease

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16
Q

Pistons rings are subjected to extreme heat, dirt, & marginal lubrication as well as_____?

A

Pressure loading

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17
Q

How many compression strokes for on a 4 stroke engine?

A

4 strokes: Intake, compression, power, exhaust.
2 complete cycles/ revolutions
1 compression stoke

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18
Q

What methods are used for checking piston rings?

A

visual inspection and operational parameters

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19
Q

. 2 stroke how many revolutions

A

one

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20
Q

The cutters in the CG fleet are equipped with what to aid in the engaging and disengaging of the power from the engines to the red gears

A

Hydraulic multi disc and overrunning clutches

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21
Q

What are the two types of screw extractors?

A

straight flute and spiral taper

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22
Q

Type of cyl liner that doesn’t come in contact with jw?

A

Cast

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23
Q

After flushing an engine how long do you run the engine before your first viscosity test?

A

15 min

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24
Q

What does the MPU-23 card exhibit what color lights when operating normally

A

Green yellow yellow

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25
Q

Center section overhauls shall be done based on the ?

A

condition of the engine not solely based on engine hours

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26
Q

If cylinder liners are to be reused, they should be inspected for wear, cracks, and _____ at each overhaul?

A

Corrosion

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27
Q

What helps steady engine RPM’s after a sudden load change?

A

flywheel

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28
Q

Defective pistons and excessive carboning of rings would indicate a problem with what?

A

Vacuum system

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29
Q

What tool is used to measure journal bearings?

A

Micrometer Plastigauge

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30
Q

CHP for an engine overhaul is what chapter in the NSTM

A

NSTM ch 233 diesel engine

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31
Q

NALFLEET is ?

A

Used to prevent corrosion in engines with dissimilar metals

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32
Q

What is a rudder stock supported by?

A

a bearing

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33
Q

Stave bearing measurement how far do you go?

A

4-6 inches

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34
Q

A rule-of-thumb used for deflection is ______ inch for each inch of engine stroke other than the last throw on the flywheel end?

A

0.0001

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35
Q

in a diesel 4 stroke engine what is the term for the timeframe which both the exhaust and intake valves are open?

A

valve overlap

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36
Q

Cylinder liners wear at the greatest rate in an area ____ degrees to the crank and in the direction of the piston thrust?

A

90 deg

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37
Q

Crankcase explosions most likely caused by what?

A

cracked pistons

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38
Q

When is the cutter engineering report due?

A

No later than Jan 31 unless at sea then report at next port

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39
Q

When new rings are installed how should you measure the gap?

A

feeler gauge

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40
Q

Corrosion resulting from loads applied by mounting bolts, in-service conditions, or even mfg processes?

A

Stress corrosion

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41
Q

Pneumatic clutches

A

Eaton Airflex

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42
Q

What occurs between the end of the compression cycle and the beginning of the power cycle in a diesel?

A

Fuel Injection

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43
Q

how often are edge type disk strainers rotated

A

one complete revolution per hour

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44
Q

Torsion couplers

A

Geisler and bvulker Reto S

Flexible couplers

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45
Q

What causes oxidation in oil?

A

temperature rise

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46
Q

What factors must be observed to determine if piston rings are setting in?

A

Crank PSI, exhaust color, compression & fire psi, & lube oil consumption

47
Q

In a propulsion plant the higher the gear ratio the ? the torque?

A

greater

48
Q

What supports shafting inside the skin of the ship?

A

Line shaft bearings

49
Q

What does the cage NOT do in roller bearings?

A

Help carry the load.

50
Q

How can a 2 stroke diesel engine be identified?

A

Cylinder ports

51
Q

How do you dress slight scoring on a crankshaft bearing surface?

A

oil stone

52
Q

On ICU if a full load is applied to quickly to an engine having new liners installed there is a risk of what?

A

Galling pistons, scoring liners, or even piston seizure

53
Q

Crankshaft question with a + sign for web deflection

A

Slowly turn crankshaft in the direction of rotation and stop when the crankshaft deflection is in the #2 position(inboards). Record any changes in pointer deflection as a + or -.. Closing of the web is a negative - value. Opening of the web is a positive value +.

54
Q

What size journal is included in the cutter engineering report?

A

4 inches or greater

55
Q

How many DEMP readings are required?

A

7

56
Q

on a 225 what is the spark plug gap and L/O pressure

A

.28-.23 23 PSI for L/o

57
Q

What chapter covers Jacket water?

A

233 NSTM Internal Combustion Engines

58
Q

Corrosion with tiny pin holes?

A

Pitting

59
Q

What tool is used to measure journals?

A

micrometer

60
Q

What is the allowable deviation from round and smooth shaft journals

A

Slight circumferential grooving is acceptable

61
Q

What do you do if the coolant nitrite level is below 100PPM

A

Add one gallon of NALCOOL for each 100 gal capacity

62
Q

What is a governor controlling the flow of oil to or from the power cylinder assy?

A

pivot valve

63
Q

How long may sea trials last to demonstrate proper operation of an overhauled engine?

A

4-6 hours

64
Q

What type of material; do we use for an o-ring?

A

nitrile and Buna s

65
Q

How far do you rotate the shaft when using plastigage?

A

Do not rotate the shaft

66
Q

what are the two types of bearings used on engines

A

anti friction and friction

67
Q

What do chunks of rubber from the shaft bearing mean?

A

overheating

68
Q

how do filters flow

A

outside to inside (reusable type)

69
Q

what ARE THE TWO TYPES OF PNEUMATIC CLUTCHES USED IN THE cg?

A

disc type and drum type

70
Q

How often do you take readings on a newly rebuilt engine?

A

15 min

71
Q

ODR readings and recorded data will be sent back to 87’s on what basis?

A

monthly

72
Q

When do you use FOP brake?

A

in emergencies only

73
Q

For the shaft rudder what is stick slip and how do you fix it?

A

Chattering or Squealing caused by the hydrodynamic water film not yet fully developed/ loosen staves

74
Q

What type of coupling utilizes oil dampened steel springs?

A

Torsion damping couplings

75
Q

Glass or plastic shaft cowling is inspected

A

every regularly scheduled dry dock

76
Q

what corrosion inhibitor is used on most 87s

A

glysacorr G93

77
Q

Corrosion that takes 6 months to surface?

A

Crevice

78
Q

. what connects the cam follower to the valve?

A

rocker arm

79
Q

What controls the engines fuel rack on a internal combustion engine?

A

the governor

80
Q

Diesel engine reading shall be taken every ___ min during break in.

A

15 min

81
Q

two inspections for a piston or cylinder]der liner?

A

visual inspection and operational parameters

82
Q

What device applies air pressure to the intake of an operating diesel engine?

A

Blower

83
Q

Who can perform calibration of diesel injectors

A

only qualified shops and facilities

84
Q

how much power does a turbo add to a naturally aspirated engine

A

50%

85
Q

How to clean a plate cooler?

A

Fiber brush, never steel or steel wool

86
Q

After freshly filling or treating coolant when do you check it?

A

24 hours
Monthly
in accordance with planned maintenance

87
Q

What causes low compression in the cylinders?

A

Poorly seated or worn rings

88
Q

CG filters

A

2types- disposable and reusable

89
Q

Chrome plated piston rings require ______ for successful seating in?

A

Higher cylinder PSI

90
Q

What do you need to properly seat a piston ring?

A

high cylinder pressure

91
Q

Suction strainer will usually be?

A

100 to 200 wire mesh

92
Q

What type of R/W system has to be closed in order to clean?

A

Simplex strainer

93
Q

What causes high oil consumption on a new engine?

A

Ring seat

94
Q

When a contractor finds heavy corrosion in a jw system they should descale with what?

A

Hydrochloric Acid

95
Q

What tools do you use to bearing shells?

A

Depth Micrometer

96
Q

Upon completion of an overhaul, the supervisor will ensure the completion is documented in what two reporting systems?

A

Next cutter engineering report, and CM plus

97
Q

What temp do you maintain an engine at during run-in to check bearings?

A

120 F

98
Q

What is the proper pressure drop across each piston ring?

A

½ the pressure above each ring

99
Q

JW sampling after treatment?

A

24 hours

100
Q

What are the three methods of connecting a piston to a conn rod?

A

Fixed, semi floating, and floating

101
Q

Chrome plated rings or liners require what for successful ring seating?

A

Higher cylinder pressures

102
Q

Demps doesn’t read?

A

Intake Air temp

103
Q

What are the advantages of sodium filled valves?

A

Provides a more rapid heat transfer

104
Q

What are the two methods for cleaning the engine block and parts?

A

soaking and flushing
Soaking is when an engine is dipped in an alkaline solution
Flushing is hot clean oil flushed through entire system

105
Q

What do you do is the oil cooler on a CAT engine fails

A

replace oil cooler

106
Q

A drop in the exhaust temp and firing pressure only would indicate a problem with?

A

fuel system

107
Q

What removes/controls the amount of oil film on cylinder

walls

A

wiper rings

108
Q

Three basic purposes of piston rings?

A

Seal, heat transfer, lubricate

109
Q

How many compression strokes for on a 2 stroke engine?

A

2 strokes: suction, and exhaust or power

1 complete cycle, 1 revolution

110
Q

What are the two basic rudder bearings used on small boats?

A

Stave and smooth

111
Q

What part of the governor positions the fuel rack of the engine?

A

servo motor

112
Q

Crankshaft counterweights will vary depending on what?

A

number of cylinders

113
Q

If chloride concentration exceeds 100 PPM

A

Dump the entire system

114
Q

Crankshaft counterweights are always found in ?

A

pairs

Main Propulsion (2 decks)

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