engine top end construction

Question 1

define bare cylinder head

Answer 1

its a complex metal casting with all of its parts removed

Question 2

what is a bare cylinder head normally made out of

Answer 2

cast iron or alluminum

Question 3

the construction of a clyinder head varies with engine —- and —-

Answer 3

deisgn and type

Question 4

an —– valve guide is part of the cylinder head casting

Answer 4

integral

Question 5

an —- valve guide is a seperate sleeve forced into a hole machined in the cylinder head

Answer 5

pressed in

Question 6

name two types of valve seats

Answer 6

pressed in and integral

Question 7

define valve seat angle

Answer 7

its an angle formed by the face of the seat

Question 8

the most common valve seat angles are

Answer 8

45 degrees and 30 degrees

Question 9

an —- angle is a 1/2-1 degree difference between the valve seat face angle and the angle of the valve face

Answer 9

interference

Question 10

a diseal prechamber cup is pressed into the cylinder head and encloses the tips of the —- and —–

Answer 10

injector and glow plug

Question 11

what is the function of an engines valve train

Answer 11

it controls the opening and closing of the cylinder head ports

Question 12

automotive engines commonly use —- or —- valves

Answer 12

poppet and mushroom valves

Question 13

define valve face angle

Answer 13

its the angle formed between the valve face and valve head

Question 14

—- filled hollow stem valves are used when extra valve cooling action is needed

Answer 14

sodium

Question 15

a stellite valve is often used in engines designed to burn —— fuel

Answer 15

unleaded

Question 16

an —- valve seal is shaped like a cup and can be made of neoprene rubber or plastic

Answer 16

umbrella

Question 17

an —- valve seal is a small round seal that fits into and extra groove cut in the valve stem

Answer 17

o-ring

Question 18

a valve spring —– is normally used with an o-ring type of seal

Answer 18

shield

Question 19

define valve spring tension

Answer 19

the stiffness of a valvenspring measured in pounds or kilograms

Question 20

valve spring —- is the length of th valve srping when removed from the engine

Answer 20

length

Question 21

define valve spring open length

Answer 21

its the springs length when installed on the engine with valve fully open

Question 22

valve spring —- is the length of the valve spring when instaled on the engine with the valve closed

Answer 22

closed

Question 23

valve — occurs when the valve fails to close entirely at high rpms because the spring is too weak

Answer 23

float

Question 24

a valve spring —- is a very thin, accuratly machined washer used to increase spring tension

Answer 24

shim

Question 25

what is the function of valve retainers and keepers

Answer 25

they lock the valve spring onto the valve

Question 26

a valve spring --- is cup shaped washer installed between the cylinder head and the bottom of the valve spring

Answer 26

seat

Question 27

explain the purpose of valve rotators

Answer 27

turns the valve to prevent carbon buildup and hot spots in the valve face

Question 28

a valve ---- helps prevent stem and rocker arm wear

Answer 28

stem cap

Question 29

what is the function of an engines camshaft

Answer 29

controls when the valves open and close

Question 30

cam lobe can be used to control ----

Answer 30

d- all the above

Question 31

cam shaft ---- is the disntance the valves open

Answer 31

lift

Question 32

camshaft ---- determines how long the valve stays open

Answer 32

duration

Question 33

define valve timing

Answer 33

refers to valve opening and closing in relation to the position of the pistons in the cylinders

Question 34

--- is the time when both the intake and exhaust valves in the same cylinder are open

Answer 34

valve overlap

Question 35

describe the purpose of a camshaft thrust plate

Answer 35

its used to limit camshaft end play

Question 36

the camshaft journals ride in the cam ---

Answer 36

bearings

Question 37

explain the term cam housing

Answer 37

its a casting that bolts to the top of the cylinder head to hhold the engine camshaft

Question 38

a cam cover serves the same purpose as a --- cover on an overhead valve engine

Answer 38

valve rocker cover

Question 39

valve --- ride on the camshaft lobes and transfer motion to the other parts of the valve train

Answer 39

lifters

Question 40

--- lifters are common because they operate quietly by maintaining zero valve clearance

Answer 40

hydraulic valve

Question 41

--- lifters are not self adjusting and require periodic adjustment

Answer 41

mechanical

Question 42

a roller lifter can be either mechanical or ---

Answer 42

hydralic

Question 43

how is valve ckearance normally adjusted on engines equipped with OHC followers

Answer 43

either an adjusting screw in the follower or shims of different thicknesses can be used to adjust valve clearance

Question 44

---- are used in cam in block engines to transfer motion from the lifters to the rocker arms

Answer 44

push rods

Question 45

describe the function of rocker arms

Answer 45

they transfer valve train motion to the valve stem tips

Question 46

rocker arms are usually made of either --- or ----

Answer 46

cast iron or steel

Question 47

----- rocker arms are used to change the valve train clearnace

Answer 47

adjustable

Question 48

one method of acheving variable valve timing uses an --- that can rotate on the camshaft

Answer 48

camshaft gear

Question 49

another method of achieveing variable valve timing relies on eletro-hydrauliclly operated --- and two different camshaft profiles for each valve

Answer 49

rocker arms

Question 50

an intake maifold holds the ---- and has passages (runners) going to each cylinder head port

Answer 50

throttle body

Question 51

---- are internal passages formed in the intake manifold to carry either the air fuel mixture or air to the cylinder head ports

Answer 51

manifold runners

Question 52

define flame arrester

Answer 52

it prevents backfire damage to the air filter

Question 53

an --- system has two sets of intake runners controlled by butterfly valves to aid engine efficiently and performance

Answer 53

variable induction

Question 54

describe the funtion of an exhaust manifold

Answer 54

routes burned exhaust gases from the cylinder head exhaust port to the echaust pipe

Question 55

a few high performance or sports car engines use lightweight , free flowing steel tubing exhaust manifolds called ----

Answer 55

headers