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10-32
GROUP 10-
FUEL SYSTEM
damage, excessive wear, burrs and warpage. Make
certain the throttle body is free of all hard carbon
deposits.
Clean all jets and main discharge jets (if
removed) by washing in cleaning solvent and
blowing through with air. Do not clean or size
these parts with drills or wires as such treatment
will affect their metering characteristics.
Discard all old gaskets and washers and use a
new Gasket Set when assembling. Genuine Repair
Kits are available and contain all components
required for a normal overhaul.
ASSEMBLY
Re-assembly each sub-assembly replacing all
components exhibiting damage or excessive wear.
PartiCular attention should be paid to the following
points.
AIR HORN (Fig. 20)
Vacuum piston (19) is staked in place after
installation.
Check the piston for free movement in
its cylinder. Do not lubricate piston or cylinder
bore.
Before tightening choke valve securing screws
(7) close valve and check for proper valve fit
against a light. Stake hollow ends of securing
screws after
tightening.
The choke shaft (6) should
be supported during this operation to prevent
bending of the shaft.
After air horn is assembled, check free
movement of choke valve and shaft as shaft
assembly is moved from its open to closed
position.
MAIN BODY (Fig. 20)
If main discharge jets (31) have been removed
,
install each jet with the bevelled side of the jet tip
parallel to the sides of the small auxiliary venturi
.
(Use Stromberg Tool 73608 when installing).
Replace
main
metering
jets
(32)
using
Stromberg Tool 73606. Screw jets home firmly but
avo.id overti'ghtening as damage to the main
discharge jets may occur.
Pump inlet check ball ( 65) fits in a central seat
located in bottom of pump piston cylinder. Pump
outlet check ball (23) drops into channel under
pump nozzle screw
(20).
Assemble float fulcrum pin (62) in float lever
and install float in float
chamber.
Place ends
of
fulcrum pin spring (63) against ledges in float
chamber and press loop of spring under boss to
secure spring.
FIG. 21
SETIING FLOAT LEVEL (Fig. 21)
With main body held in an inverted position
and with only weight of float holding float needle
valve shut, the float level "X" is measured from
main body (gasket removed) to centre of float
using Stromberg float gauge No. 73725 or a depth
gauge.
(Refer to the Specification Listing for the
correct float level dimension "X").
To adjust float level, bend float lever next to
float using Stromberg Tool 73605. Hold lip of
float lever away from needle valve when bending
float lever to avoid damaging the rubber needle
tip.
After float setting is
made,
turn carburettor to
upright position, install idle tubes (26) and place
pump inlet check ball (65) on its seat in bottom of
pump cylinder. Assemble pump bottom spring
(66) on pump piston and install pump piston in
its cylinder, making certain that piston leather is
not creased and that it bears evenly on its
complete circumference. (Apply a few drops of
light engine oil to the piston leather before
installing).
THROTTLE BODY (Fig. 20)
If the throttle shaft was removed, insert
throttle shaft in throttle body and assemble
throttle valves in same position and barrel that
valves were removed from, leaving securing screws
( 41) loose. Close throttle lever and check valves for
J?est closing against a light before tightening screws.
After tightening, the hollow screw ends should be
staked.
Support throttle shaft and valves during
this operation to prevent bending of shaft.
Install idle needle valves (45) and springs (44).
Tum each needle valve in lightly against its seat,
then back out each valve one and
a.
half turns.
Install thermostat lever & shaft (51). Assemble
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