CYLINDER
HEAD-E.4
E11
COMBUSTION CHAMBER INSERTS
These can be
gently
tapped out of
their
locations
by
means
of
a short length
of
curved
bar
through
the
atomiser
bore. When refitting they must be
located
by
means of expansion washers in the recesses provided,
as shown in Figs. E.8 and E.g.
E13
Cleaning
Remove any
carbon
from the
cylinder
head.
If the
water
jacket
within
the
cylinder
head shows
signs
of
excessive scale, then a
proprietary
brand of
descaling
solution
may be used, if
possible
the
cylinder
head should be tested
for
water
leakage
after
such
treatment
at
the pressure given on Page B.7.
VALVE SPRINGS
It is
advisable
to fit new valve
springs
whenever the
engine
undergoes
a
major
overhaul. Where a
top
over-
haul only is
being
carried out the
springs
should
be
examined, paying
particular
attention
to
squareness
of
ends and pressures developed at
specific
lengths, the
details of
which
can
be
found on Page B.8.
E12
VALVE GUIDES
The worn
guides
should
be removed
either
by means
of
a press and a suitable
"dolly"
or
the valve
guide
removal tool shown in Fig. E.10.
Before fitting the
new
guides
remove any
burrs
from
the
cylinder
head
parent
bores,
then
smear
the
bores
with
clean oil and
either
press
in the
new
guides
or
pull them in by means
of
the
tool
shown
in Fig. E.11,
until
the
guide
protrusion
above the head
top
face is
that quoted on Page B.7.
NOTE: Special
care
should
be
exercised
during
this
operation
as the guides,
being
made
of
cast iron, are
therefore
comparatively
brittle.
E14
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