CHAPTER7
neglec~
rotate back and forth until the handle can
be
turned through a complete revolution.
Do
not
force with a wrench or other tool.
Drain
the
sump
as
often
as
experience indicates
the
necessity. Remove the sump, or head
and
cartridge assembly for thorough cleaning
and
inspection
at
frequent intervals. Exercise care not
to
damage cartridge discs or cleaner blades.
Wash
the
cartridge
in
solvents. Do not attempt
to
disassemble
the
cartridge.
Cleaning Oil Nozzle
The design
of
the
burner, together with
the
oil
purge system on a heavy oil burner, make
it
unnecessary
to
clean the oil nozzle during
periods
of
operation. A routine check should be
made during off periods or when the burner
is
firing on gas
and
any necessary cleaning per-
formed.
If
at
any time
the
burner flame appears "stringy"
or
"lazy,"
it'
is
possible that.
the
nozzle
tip
or
swirler
has
become partially clogged or worn.
Any
blockage within
the
tip
will cause.
the
air
pressure gauge
to
increase above its normal
value.
Disassemble with power off by unlatching
and
withdrawing
the
burner gun. Insen
the
nozzle
body
into
the
hanger vice and
use
the
spanner
wrench
to
remove
the
tip.
Carefully remove
the
swirler
and
seating spring being careful not
to
drop or damage any parts. See Fig. 7-3.
Perform
any
necessary cleaning with a suitable
solvent.
Use a soft fiber brush or pointed piece
of soft wood for cleaning.
Do
not
use
wire or a
sharp metallic object which
is
apt to scratch or
deform
the
orifices
and
the
precision ground
surfaces
of
the swirler and tip. Inspect for
scratches or signs
of
wear or erosion which
may
make
the
nozzle unfit
for
further use. Take neces·
sary precautions when working with solvents.
The
tip
and
swirler
are
a matched set, which was
precision lapped
at
the
time
of
assembly. The
close fit
of
these lapped surfaces must
be
main-
tained
in
order
to
provide optimum performance.
Additional lapping
may
be
required to provide
CHAPTER7-8
INSPECI'ION
AND
MAINTENANCE
better atomization for more efficient combustion.
Do
not interchange parts if a spare
is
kept. During
reassembly, make certain that
the
seating spring
is
in
place and that it
is
holding the swirler tightly
against the tip. The swirler
is
stationary
and
does
not rotate, but rather imparts a swirling motion
to
the
oil.
See that
the
plugged bole
is
at the bottom
of
the
nozzle body when the gun
is
installed (see Fig.
7-3).
Cleaning
Air
Purge
Nozzle (No. 6 Oil)
and Back Pressure Orifice Nozzle
(No.2
Oil)
The air purge nozzle
and
its
strainer should
be
inspected periodically
and
cleaned. The nozzle
consists
of
a tip
and
internal core. Clean
all
internal surfaces
of
the
tip
and
the
slotted parts
of
the
core using a wood splinter
to
avoid damage
from
scratching. Replace
the
core, setting
it
tight·
ly
but not excessively so.
Qean
the
strainer screen carefully to remove any
foreign matter.
Use
suitable solvents for clean-
ing.
Extremely hot water
at
high velocity
is
also
helpful
for
cleaning. Replace strainer
by
screw
...
ing it into the nozzle body only finger tight.
Do
not
use
an
orifice
of
a size other
than
originally
installed.
Ignition System
For best ignition results, maintain
the
proper gap
and
dimensions
of
the
ignition electrode(s). Figs.
S-9
and
5-10 show the proper settings.
Inspect
the
electrode tip(s) for signs
of
pitting or
combustion deposits
and
dress
as
required with
a fine file. Inspect
the
porcelain insulator(s) for
any
cracks that might be present.
If
cracks
are
present, replace
the
electrode since cracks can
lead
to
grounding
of
the
ignition voltage. Since
carbon
is
an
electrical conductor,
it
is
necessary
to keep
the
insulating portion
of
electrode(s)
wiped clean. Ammonia will
aid
in
removing
carbon or soot.
750-150
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