Toro 303447 - Key Engine Internals: Valves and Pistons

V
alve Gui
d
Controls t
h
Subject to
corrosion,
exhaust v
a
Must provi
d
between it
s
Can be al
u
Valve Sea
t
Mate with
v
Metal to m
Usually in
s
Can be re
s
Pistons
A
cts as m
o
and must
w
stress, an
d
May use e
Elliptical w
Diameter
a
edge of pi
s
Round wh
e
d
es
h
e position
fluctuation
s
ingestion
o
a
lve, high t
e
de a predi
c
s
elf and th
e
u
minum, br
a
t
s
v
alve face
t
etal seal
s
ert but not
s
urfaced
o
veable en
d
w
ithstand
p
d
mechani
c
lliptical sh
a
w
hen cold
a
t piston pi
n
s
ton.
e
n hot
of the valv
e
s
in tempe
r
o
f foreign
m
e
mperatur
e
c
table and
c
e
valve ste
m
a
ss or sint
e
t
o seal co
m
always
d
of the co
m
p
ressure flu
c
al loads
a
pe
n
bore exp
a
e
s
r
ature, che
m
m
aterial and
e
s.
c
onsistent
c
m
.
e
red iron.
m
bustion c
h
m
bustion c
h
ctuations,
t
a
nds more
m
ical
for the
c
learance
h
amber.
h
amber
t
hermal
that thin