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PART 10-3-STROMBERG WW CARBURETTOR
10-31
5. Adjust the engine idle speed to specification
by turning the engine idle speed screw
(Fig.
13)
inward or outward.
6. Remove the tachometer from the engine and
turn the headlights and airconditioner off.
IDLE LIMITER CAPS
Should the idle limiter caps need replacement
because of deformation, mutilation or readjustment
of idling mixture to meet emission level require-
ments, the following pracedure must be adhered to
as the 'thermal conductivity' type of gas analyzer
found in most service shops is not accurate enough
to give the required carbon monoxide readings.
1. Remove the air cleaner.
2. Cut the plastic limiter cap and carefully pry
apart and remove it from the idle adjustment screw.
3. Replace the air cleaner.
EJ
MAJOR REPAIR OPERATIONS
CARBURETIOR REP AIRS
Clean exterior of carburettor to facilitate
handling and disassembly. Cleanliness of hands,
bench
and
tools
is
essential
for
efficient
carburettor servicing.
Separate the carburettor into its three basic
sub-assemblies, namely - Air Horn, Main Body and
Throttle Body.
Disassemble
each
sub-assembly
into
its
component parts, using the following special tools
in addition to normal workshop tools.
Stromberg Tool Part No. 73605 -
for bending
float lever when adjusting the float level.
Stromberg Tool Part No. 73606 - for removal and
replacement of main metering jets (Item 32, Fig. 20).
Stromberg Tool Part No. 73608- for removal and
replacement of the main discharge jets (Item 31,
Fig. 20). NOTE: Unless damage is evident or
suspected the main discharge jets should not be
disturbed.
DISASSEMBLY
The throttle valves in the open position extend
below the throttle body flange. Care should be
exercised to avoid damaging the valves or changing
their
position in
the
throttle
bores.
It
is
recommended that a suitable holding fixture be
·made up and used when servicing these units.
AIR HORN (Fig. 20)
Remove vacuum power piston ( 19) using a
block of wood and small open end wrench as a pry.
4. Set the ignition timing to specification.
5. Attach an accurate tachometer to the engine.
6. Run the engine until normal operating temp-
erature is reached.
7. Adjust the idle air/fuel mixture screws to give
the best quality idle at 20 R
.P.M.
above the
specified idle speed
.
8. Lean off the idle air/fuel mixture screws an
equal amount on each screw by turning in a clock-
wise direction until the engine R.P.M. drops to the
specified idle speed.
9. Remove the air cleaner.
10. Carefully install the black service limiter caps
on the head of each idle mixture adjusting screw.
Use a straight thumb push or the end of 3/8"
rod.
11. Replace the air cleaner and check the idle
speed to ensure that the mixture screws were not
accidently rotated while fitting the limiter caps.
12. Remove the tachometer from the engine.
This item is staked in position.
NOTE: The pump lever fulcrum screw ( 12) has a
left hand thread.
Choke valve securing screws
(7)
are staked in
their
shafts.
When removing choke valve
(8)
file off
flared end of screws before
unscrewing.
MAIN BODY (Fig. 20)
The idle tubes
(26)
are removed by lifting out
of their recesses in main body.
When pump pistoa (70) is removed place palm
of hand over pump cylinder and invert main body
to remove pump inlet check ball ( 65) from
cylinder.
Place hand over float chamber when removing
spring clip (63) to prevent possible Injury from
flying clip.
After pump nozzle (21) is removed, invert
main body and catch outlet check ball
(23)
as it
drops from channel.
THROTTLE BODY (Fig. 20)
NOTE: Because of the very accurate production
fit, the throttle shaft and valves should not be
removed unless excessive wear is evident.
Throttle valve securing screws ( 41) are staked
in their shaft. If removing valves, file off flared end
of screws before unscrewing.
INSPECTION
Having
disassembled
each
sub-assembly,
thoroughly clean all castings and metal parts in a
suitable cleaning solvent and blow out all passages
and tubes with compressed air. Inspect castings for
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