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10-18
der a la.d condition In
this
manner
In
order to obtain the specified
en-
cine Idle speed
durl~
the adjustment
proeedure-
4.
On a ear with a manual shift
transmission, the
~ine
Idle
speed
is
checked and adjusted with the
leal'
shift lever in neutral position. On a
ear with an automatic tr&Dsmiaion,
the
e~lne
Idle
speed
is checked &D4
adjusted ftnt with the transmission.
~elector
lever in the neutral position.
and adjusted with the transm•uton
~elector
lever in the drive nnre po-
sition.
FIG.
8
-Idle Speed
Adiustments-BV2-Typical
5.
Adjust
the engine
idle speed
to
specifications
(Part 10·9) by turning
the engine idle
speed screw
(Fig. 8)
inward
or
outward.
If the car is
equipped
with an auto·
matic
transmission, position
the
selector
lever in drive range to check and adjust
the idle speed to specification (Part 10·9)
if necessary.
The ftnal
e~lne
idle speed may
be
varied
to suit the conditions un-
der which the ear is to be operated.
(On the Stromberg BV-2
carburettor,
cold idle speed is automatically
obtained
with hot idle adjustment).
IDLE LIMITER CAPS
Should the idle limiter
caps
need
re-
placement because of deformation or re-
adjustment
of idling mixture
to
meet
emission level requirements,
the following
'thermal conductivity'
type of gas
analyzer
found in most service shops is not
accurate
enough to give the
required carbon monox-
ide readings.
1. Remove the air
cleaner.
2. Cut the plastic limiter
cap
and
care-
fully pry the
cap apart
and remove it from
the idle adjustment
screw.
3.
Replace the
air
cleaner.
4. Set the
ignition
timing
to specifica-
tion.
GROUP 10-
FUEL SYSTEM
5. Attach an accurate tachometer to
the engine.
6.
Run the engine until normal opera-
ting temperature is reached.
7. Adjust the idle air/fuel mixture
screw to give the best quality idle available
at 20 R.P.M. above the specified idle
speed.
8.
Lean off the idle air/fuel mixture
adjusting screw
in
a clockwise direction
until the engme R.P.M
.
drops to the speci-
fied idle
speed.
9. Remove the air cleaner.
10. Carefully install the black service
limiter cap on the head of the idle mixture
adjusting screw.
11. Replace the air cleaner and
check
the idle
speed
to ensure that the mixture
screw was not accidently rotated while
fitting the limiter
cap.
12.
Remove the tachometer
from
the
engine.
FIG. 9
-Accelerating
Pump Stroke Adiustment
-Stromberg BV2
ACCELERATING PUMP
ADJUSTMENTS
Accelerating
Pump
Stroke-
(Fig.
9)
Do
not remove the carburettor from
the engine
to
adjust the pump stroke.
To check the pump stroke
:
1. Start the engine and run at idle
to normalise engine temperature.
Set
the engine to the correct idle speed.
This is important as it gives the cor-
rect closed throttle position.
2.
Stop
engine
and
remove
c~.ir
cleaner
assembly (page 10-67, Section
2)
and carburettor air horn
(page
10-20,
Section 3).
3. Measure from the top of the
pump piston stem to the top face of
the carburettor main body with gas-
ket removed.
4.
Open throttle wide and again
measure from the top of the pump
piston stem to the top face of the
carburettor or main body with gasket
removed.
5. The difference between these
two measurements will be the length
of the pump stroke.
This length
should
be
within the specified limits
with the mean size of
the
limits be-
ing desirable.
If
the measurement is found to be
outside the specified limits, the pump
stroke can be adjusted by bending
the arm <top, horizontal position> of
the pump
rod.
No more than
1(64"
to 1(32" adjustment should be re-
quired. Two bends in the arm will
be necessary to keep the hole in the
arm parellel with the pump
stem.
6.
Return the air horn
gasket to
FIG.
1
0-Fioat Adiustment
its position and
replace the air
hom
and air cleaner
6BB6mbly.
The capacity of the accelerator
pump is correctly calibrated
at the
specified pump stroke and any
varia-
tion of this stroke outside the
limits
given must result in reduced per-
formance and economy.
FLOAT ADJUSTMENT
The dry fioat adjustment is a pre-
liminary factory adjustment only,
The final adjustment <Fuel Level
Float
Adjustment-Wet)
must
be
made after the carburettor is mount-
ed
on the engine.
FUEL LEVEL
FLOAT ADJUSTMENT (WET)
·
The fuel pump pressure
and
volume
must
be
to specification
(Part
10-9)
prior
to
performing
the
following
adjustments
: -
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