Fig,
2 - Timing Chain
and
Gears
Ins
tall
ed
Timl.nq
Chain
Ca
se
Cover
Oil
Seal
(All
Engines
)
The
unit
type
chain
case cover oil seal
has
been
replaced by
a new
gasket-type
seal.
as
sh('wn in
Fi
g
ur
e 3, To replace seal. puB seal assembly
out
of cover, using puller
part
of
T
ool
C-3506,
Pla
ce
new seal assembly in position,
and
with
the in-
staller,
part
of Tool C-3506, press seal assembly
int
o cover,
OIL
SEAL
A'1'"""
56,,46
Fig
, 3 -
Tim
ing Chain
Case
Cover Oil Se
al
Assembly
53
NOTE:
Wheneve1' an engine has been 1'ebuilt
and a new camshalt andl
o1'
new tappets have
been installed, one
(/UU1't
01
MaPa"
Oil Additive
should
be
added
to
the engine oil
to
aid b1'eak-in,
The
oil
mixture
should
be
lelt
in
the engine
lor
a
minimum
01
500 'miles, However,
it
is not nec-
essary
to
d1'ain
the 1nixtu1'e belm'e a normal oil
change is
requhed,
no}'
is
it
necessal'y
to
use the
oil additive
at
subsequent oil changes,
CYLINDER HEAD
CAUTION: The
1955
cylinder heads and head
gaskets are not interchangeable
with
the same
models
101'1956,
Be
sw'e the cylinder heads and
head gaskets
al'e
positively identified
as
being
the
COl'Tect
ones
belo1'C
installing them
on
the
engine,
The
cylinder heads
for
the
sing
le rocker
shaft
engine
(SpitFire).
have
the
water
holes relo-
cated to
match
those
of
the
cylinder block; also
the
spar
k plugs have been moved
farther
into
the
combuslion
chamber,
The
water
holes
in
the
cylinder heads for
the
double
rocker
shaft
engine
(FirePower)
have
also been relocated to co
nform
to those of
the
cylinder block,
The
co
ntour
of
the
combustion
chamber
has
been modified slightly,
The
remov-
able
exhaust
valve
seat
in
serts
have
been elimi-
nated and
\~i1l
now be in
tegral
with
the
head,
as
in
the
SpilFire
engine,
The
inner
valve s
pring
s have been eliminated
res
ulting
in
!lew
outer
valve
springs
with a
larger
0,0,
New in
take
and
exhaust
valves
which incorpo
rate
the
four-bead floating lock
and
the umbrella type oil seal on the intake
valve will be
used,
(Same
as
on
SpitFire
en-
gine,)
The
oil hole
and
the l.D,
chamfer
at
the
top (cold end) of
the
exhaust
valve guide
have
been removed,
An
J.D,
chamfer
is used
at
the
bottom
(hol
end) of
the
exhaust
valve guide,
NOTE:
The changes described
101'
the Fi,'e-
Powel'
engine also apply
to
the 300 B engine,
with
the exception that the inne1' and outer
valve springs and the
removable valve seat in-
sel't
lvill
be
1'etained on the 300 B engine.
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