EOC

Question 1

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

Answer 1

0.025”

Question 2

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

Answer 2

0.50 mm

Question 3

thread chasers use for

Answer 3

will clean damaged external or internal threads.

Question 4

types of water pumps

Answer 4

displacement pump
volume pump

Question 5

displacement water pump

Answer 5

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

Question 6

pilot water/(tell tale) frozen

Answer 6

The pilot water indicator shows the water pump is working.

Question 7

flushing cooling system

Answer 7

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.

Question 8

RPM flushing cooling

Answer 8

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

Question 9

poppet valve stuck open

Answer 9

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

Question 10

poppet valve stuck closed

Answer 10

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

Question 11

stray current corrosion causes

Answer 11

poor grounding

Question 12

major component of a closed coolant system

Answer 12

raw water pump

Question 13

forward only gear case

Answer 13

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

Question 14

shaft breakage due to high energy impacted

Answer 14

smooth break

Question 15

marine lubricants

Answer 15

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

Question 16

inspection lower unit

Answer 16

helps determine the cause of lower unit failure

Question 17

clutch dog damage

Answer 17

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

Question 18

inspection of prop shaft

Answer 18

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

Question 19

sealing problems

Answer 19

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

Question 20

conducting pressure and vacuum test reason

Answer 20

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

Question 21

pressure testing gear case

Answer 21

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.

Question 22

jet pump benefits

Answer 22

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

Question 23

measuring backlash

Answer 23

dial indicator method
gauging method
gauging/dial indicator method

Question 24

shimming tech tip

Answer 24

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

Question 25

checking backlash method

Answer 25

gauging method

Question 26

machine tolerances purpose

Answer 26

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

Question 27

use of shims

Answer 27

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

Question 28

gear position during shimming

Answer 28

nuetral

Question 29

stern drive water pump location

Answer 29

mounted at the front of the engine | may be driven by engine or drive belt

Question 30

closed coolant flow

Answer 30

thermostat controls the engine temperature by controlling the coolant flow

Question 31

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

Answer 31

cold weather or extended storage

Question 32

flushing raw water system

Answer 32

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

Question 33

exhaust path from engine to drive

Answer 33

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

Question 34

main parts of transom assembly

Answer 34

bell housing gimble ring gimble housing inner transom plate

Question 35

alignment check

Answer 35

check before installing drive unit

Question 36

alpha popularity

Answer 36

it is most popular in industry

Question 37

straight bevel gears

Answer 37

they have more power efficiency

Question 38

spiral bevel gears less noise

Answer 38

smoother power flow with less noise due to more tooth engagement

Question 39

power, trim, and tilt shock valve use

Answer 39

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

Question 40

purpose of thermal valve

Answer 40

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

Question 41

electric motor use

Answer 41

drives the hydraulic pump for up and down operation.

Question 42

parts of prop blade

Answer 42

propeller blade tip leading edge trailing edge cup hub diffuser ring

Question 43

purpose of diffuser ring

Answer 43

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

Question 44

blade diameter

Answer 44

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

Question 45

prop rake

Answer 45

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

Question 46

prop pitch

Answer 46

Pitch refers to the amount of twist in the blades

Question 47

prop ventilation

Answer 47

Ventilation results when air enters the blade area, causing the propeller to lose its bite on the surrounding water | incorrectly referred to as “cavitation."

Question 48

what is cavitation

Answer 48

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

Question 49

high performance props

Answer 49

High-performance propellers run partly out of the water while propelling light loads | very inefficient if run totally submerged

Question 50

prop removal and replacement

Answer 50

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

Question 51

back flush for impeller parts

Answer 51

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

Question 52

steering components midsection

Answer 52

steering arm swivel bracket

Question 53

purpose of return valve

Answer 53

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

Question 54

installing prop with too little pitch will result

Answer 54

engine over-rev at full throttle

Question 55

why not attempt to fill drive unit using oil vent hole

Answer 55

air could be trapped resulting in lower unit damage