FUEL
SYSTEM
Page
L21
and float setting.
In
th:; instance, however, fit the new needle valve
assembly
W:!!'
a new washer.
3.
Unscrew damper assembly from centre of cover. Unscrew the four cover
fixing screws and
carefvlly lift off cover. Remove air valve r~
Jm
spring
then take
out air valve and diaphra
g
m assembly. Avoid possibility of
corrosion to shaft
fram perspiration of hands by lifting upwards with the
diaphragm.
4.
Drain ail from damper reservoir (centre of guide rod). Slacken
rr
:tering
needle guide screw and withdraw metering needle from air volve by turning
adjusting screw anti (counter)
-
clockwise with special tool (X036
S
6172
Z).
Place the needle assembly wrefully to one side to avoid damage.
5.
To fit the new diaphragm, unscrew the four screws holding the diu,..tragm
retaining ring onto valve, making sure that the locating toL
1s
recessed into
the aperture provided. Drop in retaining ring and replace the four fixing
screws tightly.
6.
Take metering needle and check spring action in the housing at the top of
the shank. Fit metering needle into base of air valve, lining up the
keyway
with the guide screw, and gently press into air valve.
Once strong resistance
to further entry
is
felt, draw the needle in further by turning the needle ad
-
justing screw clockwise. Tighten the guide screw, ensuring that it locates
in the
keyway in the needle assembl
y
. The needle should be drawn into the
air valve until its shoulder
is
flush with the bottom face of the air volve.
Shoulder alignment
is
extremely critical and this operation should be accur
-
ately carried out. Correctly fitted, the needle
will
oe
biased away
frrrr~
the
throttle and the shoulder of the needle will be exactly flush with the
air
valve face. To check that the correct needle
is
fitted, hold the housing and
CAREFULLY pull out the needle. The needle ide~~~ification can then be
seen on its
shank.
7.
Carefully enter air valve and dia
p
hra
g
m assembly into the moin body, guid-
ing the metering needle into the iet ~sith a finger
in
the uir intake. Locate
the outer tag of diaphra
g
m in aperture of top of body.
8.
To check assembly, look down centre of air valves to see tliat the two de-
pression transfer holes are parallel to
tcr
'L.-+tie spindle and that the :neter-
ing needle
is
also biased away from the throttle.
9.
Replace air valve return spring.
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