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marine course 2 quiz 3 > EOC > Flashcards

EOC Flashcards

1
Q

one rotation of the thimble on a standard micrometer is equal to

A

0.025”

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2
Q

one rotation of the thimble on a metric micrometer is equal to

A

0.50 mm

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3
Q

thread chasers use for

A

will clean damaged external or internal threads.

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4
Q

types of water pumps

A

displacement pump
volume pump

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5
Q

displacement water pump

A

A displacement pump will pump out as much water as it draws in.

In a displacement pump, the impeller is sealed to the wall of the pump b

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6
Q

pilot water/(tell tale) frozen

A

The pilot water indicator shows the water pump is working.

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7
Q

flushing cooling system

A

Always back flush the engine if impeller is damaged. failure to back flush damaged pieces out of the system results in powerhead blockage and damage.

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8
Q

RPM flushing cooling

A

To properly flush an engine, run the engine at a fast idle,
no longer than 10 to 15 minutes.

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9
Q

poppet valve stuck open

A

the engine will not reach proper operating temperature (run cold) and will run rough at idle.

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10
Q

poppet valve stuck closed

A

if the poppet valve is stuck closed, the engine will cause an overheat condition at high rpm.

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11
Q

stray current corrosion causes

A

poor grounding

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12
Q

major component of a closed coolant system

A

raw water pump

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13
Q

forward only gear case

A

the power flows from the crankshaft to the driveshaft via a splined coupling

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14
Q

shaft breakage due to high energy impacted

A

smooth break

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15
Q

marine lubricants

A

Marine lubricants are formulated to be water-soluble so that any water entering the gear case is emulsified with the oil

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16
Q

inspection lower unit

A

helps determine the cause of lower unit failure

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17
Q

clutch dog damage

A

This is a sign of a misadjusted shift system or
operator shifting too slowly.

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18
Q

inspection of prop shaft

A

Is it bent? This is the result of hitting something. Is the propeller shaft split lengthwise? This is usually from a loose stainless steel prop

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19
Q

sealing problems

A

rust sometimes prevents a seal from having a smooth and proper fit with the shaft.
make sure direction of seal lip is correct

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20
Q

conducting pressure and vacuum test reason

A

the lower unit is disassembled
if water is discovered in the lower unit lubricant.

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21
Q

pressure testing gear case

A

Attach a pressure tester (such as a Stevens S-34) to the oil level hole and pressurize the gear case to the service manual specification.

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22
Q

jet pump benefits

A

allows for easy navigation in shallow water and allows for beaching of a boat at remote locations.

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23
Q

measuring backlash

A

dial indicator method
gauging method
gauging/dial indicator method

24
Q

shimming tech tip

A

If the lash is too tight, the teeth are too close together

25
Q

checking backlash method

A

gauging method

26
Q

machine tolerances purpose

A

indicates how many hundredths of a
millimeter the machined surface is from specification

27
Q

use of shims

A

Shims correct for machining tolerance to get the correct gear lash.

28
Q

gear position during shimming

A

nuetral

29
Q

stern drive water pump location

A

mounted at the front of the engine

may be driven by engine or drive belt

30
Q

closed coolant flow

A

thermostat controls the engine temperature by controlling the coolant flow

31
Q

propylene glycol use in raw water section of cooling system is for

A

cold weather or extended storage

32
Q

flushing raw water system

A

it is required if the engine is operated in salty, polluted, or mineral-laden waters

33
Q

exhaust path from engine to drive

A

engine flywheel, passing through the transom via a driveshaft.
The upper gear housing will change the direction of the power and send it down to the lower unit.

sterndrive transom assembly

34
Q

main parts of transom assembly

A

bell housing
gimble ring
gimble housing
inner transom plate

35
Q

alignment check

A

check before installing drive unit

36
Q

alpha popularity

A

it is most popular in industry

37
Q

straight bevel gears

A

they have more power efficiency

38
Q

spiral bevel gears less noise

A

smoother power flow with less noise due to more tooth engagement

39
Q

power, trim, and tilt shock valve use

A

release the oil between the piston and the free piston
absorbs the impact when the outboard collides with the obstacles in the water

40
Q

purpose of thermal valve

A

release the pressure, when the excessive thrust is applied when the internal pressure rises excessively due to the change in temperature

41
Q

electric motor use

A

drives the hydraulic pump for up and down operation.

42
Q

parts of prop blade

A

propeller blade tip
leading edge
trailing edge
cup
hub
diffuser ring

43
Q

purpose of diffuser ring

A

creates a region of high-pressure water between the blades and the exhaust to prevent exhaust gases from mixing with the water

44
Q

blade diameter

A

the distance from the center of the hub to the blade tip, multiplied by two

45
Q

prop rake

A

A blade that angles back from the hub has a rake that is a certain number of degrees from perpendicular.

46
Q

prop pitch

A

Pitch refers to the amount of twist in the blades

47
Q

prop ventilation

A

Ventilation results when air enters the blade area, causing the propeller to lose its bite on the surrounding water

incorrectly referred to as “cavitation.”

48
Q

what is cavitation

A

the process that occurs due to the relationship between
atmospheric pressure and the boiling point of water.

49
Q

high performance props

A

High-performance propellers run partly out of the water while propelling
light loads

very inefficient if run totally submerged

50
Q

prop removal and replacement

A

shift outboard to nuetral position
remove spark plug so engine wont start
straighten bent tabs on prop nut retainer

51
Q

back flush for impeller parts

A

Pieces of the damaged impeller are most likely in the cooling system passages
this results in powerhead
blockage and damage

52
Q

steering components midsection

A

steering arm
swivel bracket

53
Q

purpose of return valve

A

After contacting an obstacle, oil is released between the piston and the free piston. Oil returns through the return valve to the upper chamber and the outboard tilts down

54
Q

installing prop with too little pitch will result

A

engine over-rev at full throttle

55
Q

why not attempt to fill drive unit using oil vent hole

A

air could be trapped resulting in lower unit damage

marine course 2 quiz 3 (1 decks)

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