quiz 3

Question 1

wrench to use on fuel line fittings

Answer 1

flare nut

Question 2

instrument use to measure crankshaft runout

Answer 2

dial indicator

Question 3

what measures main bearing journal diameter

Answer 3

micrometer

Question 4

needle movement on dial bore gauge from top of cylinder to bottom

Answer 4

out of round

Question 5

measurement, biggest to smallest on each axis of cylinder to find

Answer 5

taper

Question 6

wrench never used to loosen fasteners

Answer 6

torque wrenches

Question 7

correct wrench used to loosen fasteners

Answer 7

socket

Question 8

hammer used for engine disassembly

Answer 8

dead blow

Question 9

standard pitch/thread count of metric fastener is measured in?

Answer 9

mm per thread

Question 10

fastener used for high clamping force

Answer 10

uniform bearing stress (UBS) fastener

Question 11

when altitude increases, what is the effect on the air/fuel mixture

Answer 11

lean

Question 12

ratio of air/fuel mixture enter cylinder vs 100% full

Answer 12

volumetric efficiency

Question 13

detonation

Answer 13

spontaneous combustion after normal timed ignition

Question 14

pre-ignition

Answer 14

a point within the combustion chamber when it becomes so hot that it becomes a source of ignition and causes fuel to ignite before spark plug fires

Question 15

service limits

Answer 15

wear limits for in service engine

Question 16

5 events of 4-stroke engine

Answer 16

intake
compression
timed ignition
power
exhaust

Question 17

stroke def

Answer 17

piston travels from TDC-BDC and vice versa

Question 18

wrist pin retainer clip

Answer 18

retainer clip opening in line to be with the connecting rod

Question 19

push rods function

Answer 19

transfer linear motion of lifter to rocker arm

used on most linline 4,6,v-6,v-8 engines

Question 20

camshaft motion

Answer 20

changes rotary motion to reciprocating motion

Question 21

loop scavenging

Answer 21

transfer ports are angled to minimize the loss of charge out of the exhaust ports

Question 22

2-stroke induction systems

Answer 22

piston port
cylinder reed
case reed

Question 23

crankshaft motion

Answer 23

reciprocating motion to rotary motion

Question 24

valve overlap disadvantages

Answer 24

loss of torque
hp at low rpm
possibility of high exhaust hydrocarbon emissions

Question 25

cylinder leak down % if engine is in good condition

Answer 25

6-14%

Question 26

yamaha model # first character F

Answer 26

1 | 4-stroke

Question 27

setting cam tension on auto cam chain tensioners

Answer 27

fully auto chain/belt tensioners adjust as engine is running | they do not use locking bolt

Question 28

valve lash on screw locknut system, cylinder being adjusted is in what position

Answer 28

rotate crankshaft to TDC compression

Question 29

if there is low compression, how would you determine if the piston rings are the cause

Answer 29

add a little bit of oil into cylinder and recheck. if compression rises, the piston rings are worn

Question 30

2-stroke cylinder configurations

Answer 30

single cylinder inline series v-series

Question 31

cylinder position on leak down test

Answer 31

rotate crankshaft until piston of cylinder is at TDC on compression stroke

Question 32

temperature of engine for compression test

Answer 32

operating temperature

Question 33

first step to remove stern drive engine

Answer 33

disconnect battery for safety

Question 34

when changing a 40hp engine to a 75hp engine, what do you check

Answer 34

the fuel condition

Question 35

1/4 * 20 * 1/2 fastener, what does the 20 mean

Answer 35

20 threads per inch

Question 36

the difference in high/low readings that would indicate problems during compression test

Answer 36

when the difference is greater than 10%