Advertisement
PART 10-1-
GENERAL FUEL SYSTEM SERVICE
10-13
EJ
CLEANING
AND INSPECTION
CADURmORS
Dirt, gum, water or carbon
con-
tamination in the carburettor or
the
exterior moving parts of the carburet-
tor are often responsible for unsatis-
factory performance. For this
reason
emcient carburetion depends
upon
careful cleaning and inspection.
The cleaning and inspection
of
only those parts not included in the
carburetor overhaul repair
kit are
covered here. All gaskets and
parts
included in the repair kit
should be
installed when the carburettor is
as-
sembled and the old gaskets
and
parts should be discarded.
Wash all
the carburet tor parts except
the accelerating pump diaphragm,
and
the power valve in clean commercial
carburettor cleanmg
solvent.
If
a
commercial solvent is not available,
lacquer
thinner or denatured alcohol
may be
used.
Rinse the parts in kerosene
to
re-
move all traces of the cleaning sol-
vent, then dry them with compressed
air. Wipe all parts that cannot be
immersed
in
solvent with a clean,
soft,
dry cloth.
Be
sure all dirt, gum,
carbon and other foreign matter
are
removed from all parts.
Force compressed air tnrough all
passages of the carburetor.
Do
not
use a wire brush to dean
any parts
or a drUI or wire to
dean out any
openin1s or passa1es
in the carbu-
retor.
A
drill or wire may enlarge
the hole or passage, changing
the
calibration of the carburettor.
Check the choke shaft for grooves,
wear
and
excessive
looseness
or
binding.
Inspect the choke
plate
for
nicked edges and for ease
of opera-
tion and free it if necessary.
Make
sure all carbon and foreign
material
has been removed from
the auto-
matic choke housing and the
piston.
Check the operation
of
the
auto-
matic choke piston in the
choke
housing to make
certain
it
has free
movement.
Check the throttle shaft(s)
in the
bore(s) for exceBBive loosenBBB
or binding
and check the throttle plates for
burrs
which prevent proper closure.
On Stromberg carburettors, check
the
metallic float for leaks
by holding
it under
.
water that has been heated
to
just below the boiling point. Bubbles
will appear if there is a leak. If a float
leaks, replace it. Replace the float if the
arm needle contact surface is
grooved.
If the float is serviceable, polish the
needle contact surface with crocus cloth
or steel wool. Replace the float shaft
if it is worn.
Replace all screws and nuts that
have stripped threads.
Replace all
distorted or broken springs.
Inspect all gasket mating surfaces
for nicks and burrs. Repair or replace
any parts that have a damaged gas-
ket surface.
On
2-V
and
4-V
oarburettors, inspect
the
idle
tubes
in
each nozzle bar 8886m·
bly. If they are plugged, bent or broken,
replace the booster
venturi
and nozzle
bar 8886mbly.
FUEL PUMP
On all fuel pumps,
except Carter
permanently
sealed
types,
clean
the
fuel pump body,
valve
housing
and
cover.
Blow out all body, hous-
ing
and cover
passages.
Inspect the
pump body,
valve
housing, cover,
rocker
arm,
spring and
pin
for
cracks
or damage and replace them
if
necessary.
If
the fuel valYes are
not serviceable and replacement
is
necessary, replace the valve housing
and valves as an assembly, Inspect
the mounting flange for distortion.
Remove the pump body or lap the
distorted flange if
necessary.
On
all
Carter permanently sealed
fuel pumps, clean the fuel pump with
a
cloth.
Inspect the fuel pumps for
c:racka
or damage. Inspect the
moun~
1ng
ftange
for cllatortlon.
Lap
the
dlatorted flange, if nec:essary. Inspect.
the rocker
arm
for wear, cracks or
damage. The
rocker arm
spriD(, pin
and
&be
rocker arm are
&be oDiy com-
poDeD&e
on
&be
perm&Den&ly
sealed
fael
pampa
&bat are
replaeeable. U
any other fuel pump components are
damaged beyond repair, replace the
fuel pump.
AIR CLEANER
MAINTENANCE
Refer
to
Group
19
for
the
recom-
mended air cleaner assembly main-
tenance mUeage interval.
REMOVAL AND
INSTALLATION
Refer
to page
10-67,
Section
2 for
the air
cleaner 8886mbly removal and
installation procedures.
FILTER
ELEMENT
The eellulose fibre filter
elemen~
must never
be
cleaned with
a
solvent
or cleanJnr solution.
Also,
oU must
not
be added
to the
surfac:es
of tha
filter element or air cleaner body.
There are two alternate procedures.
that can
be
used to clean the air
filter element. One method
is
per-
formed with the use of compressed
air.
The other
is
perfomed
by tapping
the element on
a smooth horizontal
surface.
Compressed Air Method
Direct a
stream
of
compressed
air
through
the element
in the direction
opposite
that
of the
intake
air flow,
that
is
from
the
inside
outward.
Ex-
treme c:are must
be
exercised to pre-
vent rupture of the element materiaL
Tappin, Method
Hold the element
in the vertical
position and tap it lightly against a
smooth, horizontal surface to shake
the dust and dirt out.
Do
not deform
the
element or clama&'e &be
psket
sarfaees
by tapplnl too
hard.
Rotate
the ftlter after
each
tap until
the
entire outer surface
has
been cleaned.
lnspec:tlon
Hold the filter in
front
of a back-
up light and carefully
inspect it
for
any splits or
cracks.
If the filter
is
split or cracked, replace
it.
BODY
AND
COVER
Clean the air cleaner body and
the
cover with a solvent or com-
pressed air.
Wipe the
air
cleaner
dry
if a solvent
is
used. Inspect
the
air cleaner body and cover
for
dis-
tortion or damage at the gasket mat-
ing ·surfaces. Replace the cover or
body
if
they are damaged beyond
repair.
Advertisement
