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Mk1 > Propulsion > Flashcards

Propulsion Flashcards

1
Q

Where do you measure plastiguage

A

Widest part

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2
Q

How many rotations of crankshaft for plastigauge to work

A

None

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3
Q

What is happening if you have a fine mist coming oil of your red gear

A

Mist eliminator is full

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4
Q

Main gear on a reduction gear is what type

A

Helical

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5
Q

Radial shaft bearing prevents what

A

Radial bearings support the shaft

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6
Q

Whipping of the bearing happens when?

A

Lack of oil, poor bearing contact, pinched bearing or insufficient clearance

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7
Q

How long must ship be in water before taking shaft readings?

A

2 days minimum

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8
Q

Cpp oil should be tested for water when?

A

Weekly

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9
Q

What happens to a new stern tube bearing at low speeds?

A

Gripping

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10
Q

Space of gear tooth of a red gear to the area in which it mates is called what?

A

Backlash

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11
Q

Most likely cause of a crankcase explosion with no indicators is what?

A

A cracked or blown piston

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12
Q

How is TIN measured in a spectrometeric oil analysis?

A

Ppm

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13
Q

What does SSS clutch stand for?

A

Synchro self shifting

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14
Q

what do you do about minor scratches or scores?

A

Grinding and lapping

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15
Q

What supports rudder shaft?

A

Bearings

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16
Q

What type of o-ring offers the very best in leakage control?

A

SAE flat face o-ring

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17
Q

What do you grease when replacing a lower unit on 225 outboard?

A

Shift rod, shaft splines, and water tube seal

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18
Q

Rudder stock is supported by what?

A

Bearings

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19
Q

On larger diesel engines improper main bearing bore alignment may be found using what?

A

A crankshaft deflection gauge or by indications of wear in the main bearings

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20
Q

What helps with instantaneous crankshaft load change?

A

Fly wheel

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21
Q

Best o-ring for petroleum

A

Nitrile of fluorocarbon rubber

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22
Q

How is a mechanical seal held in place?

A

Mechanical force

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23
Q

What is a gland when it pertains to a sealing device ?

A

A cavity of a stuffing box, which surrounds and supports the sealing device

24
Q

What type of coolant is used for a keel cooler

A

Commercial anti-freeze

25
Q

What is a rudder attached to on a cutter

A

Rudder post

26
Q

Mist emitting from a reduction gear

A

Bad precipitator or mist eliminator

27
Q

Demps stands for what and what are the readings?

A

Diesel engine maintenance programs

Cylinder compression pressure, cylinder firing pressure, cylinder exhaust pressure, crankcase vacuum, intake manifold pressure , and lube oil consumption

28
Q

What do chrome plated cylinder liner and rings need to better brake-in/seat?

A

They require higher cylinder pressures for successful ring seating

29
Q

Five sections of a turbine?

A

Compressor, combustion chamber, gas generator turbine, power/free turbine, and accesory drive

30
Q

Reduction gear oil change intervals?

A

1000 hrs for oil, 500 hrs for oil breather, and 100 hrs for output flange seals

31
Q

What is done by coating gear teeth with Prussian blue?

A

Spotting

32
Q

Satisfactory tooth bearing is what percentage of working space?

A

80%

33
Q

What temp is the hot oil flush on a newly overhauled engine?

A

175-190F

34
Q

What vibration dampener is the best at all speeds?

A

Viscous type dampener
(Reduces stresses created throughout the whole speed range of the engine)

35
Q

You see small rubber pieces coming out the shaft seal this is caused by what?

A

Overheating

36
Q

Shaft bearings prevent what kind of play?

A

Side-side

37
Q

What type of cylinder does not have coolant flowing around it?

A

Dry cylinders

38
Q

At what point does the power stage start on a two stroke engine

A

After TDC

39
Q

How many turns on a crankshaft to complete a whole cycle on a 2 stroke?

A

1

40
Q

What is the main gear on ships shaft

A

Bull gear

41
Q

What is done to valve seats to make sure they seat properly

A

Grinding/lapping

42
Q

Most common contaminants piston rings face are dirt and ?

A

Water

43
Q

If you have a high exhaust temp on one cylinder but the rest are normal what is your problem?

A

Bad injector

44
Q

What type of filter lies between the pump and engine?

A

Full-flow

45
Q

Cutters equipped with jacking gear should have it in what position when not in use?

A

Disengaged

46
Q

All anti-friction bearings have what in common?

A

Rollers

47
Q

What temp increase of jacket water across a CAT engine?

A

10-12 degrees

48
Q

What position is the crankshaft in when you have a positive deflection reading?

A

Position 1

49
Q

Your ship must be what before taking shaft readings?

A

Waterborne for 2 days minimum

50
Q

What is the minimum crankshaft diameter required to perform web deflection?

A

4in

51
Q

After oil and filter change how many hrs minimum before sampling?

A

25hrs

52
Q

What happens when oil reacts with heat and air?

A

Oxidation

53
Q

Sodium intake valves and exhaust valves help with what?

A

Heat dissipation

54
Q

What is not a symptom of a failed bearing?

A

Oil leak

55
Q

What is the max play in RBM reversing bucket bushing?

A

None MPC says to replace if any play is found

56
Q

45 RBM how much oil in the bearing housing?

A

.48 gallons

Mk1 (16 decks)

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