Choke pull-down setting
(Solex carburettor)
24 Pull the carburettor choke linkage to fully
close the choke valve, and hold the linkage in
this position.
25 Attach a hand-held vacuum pump to the
choke pull-down diaphragm, and apply a
vacuum to the diaphragm so that the
diaphragm rod is pulled fully into the
diaphragm body. In the absence of a vacuum
pump, the rod can be pushed into the
diaphragm with a small screwdriver.
26 With the rod fully retracted, use the shank
of a twist drill to measure the clearance
between the edge of the choke valve and
bore, and compare this to the clearance given
in the Specifications (see illustration). If
necessary, remove the plug from the
diaphragm cover and adjust by turning the
adjustment screw. Once the pull-down setting
is correctly adjusted, refit the plug to the
diaphragm cover and remove the vacuum
pump (where used).
Float height setting
(Weber carburettor)
27 For float and level settings, remove the
float chamber cover and hold it vertically.
28 With the gasket in position, use a steel
rule or vernier calipers to check the height of
the floats. Bend the float tongue and
connecting bars if necessary.
Choke opening after starting
(Weber carburettor)
29 Remove the air inlet from the top of the
carburettor. Pull the choke control knob out
fully to close the choke flap.
30 Disconnect the vacuum pipe from the
anti-flood capsule.
31 Connect a hand vacuum pump (or a
modified bicycle pump) to the capsule. Apply
vacuum (400 mm Hg approx.) to the capsule.
The choke flap should open far enough to
admit a drill shank or rod 5 mm in diameter.
32 Adjust if necessary by means of the screw
on the anti-flood capsule.
33 Disconnect the vacuum pump, remake
the original vacuum connection, and close the
choke flap.
34 Having adjusted the anti-flood capsule,
move the choke opening roller into the recess
of the cam as shown (see illustration).
35 Check that the choke flap opening just
admits a drill shank or rod 8 mm in diameter.
36 Adjust by turning the nut shown (see
illustration) after removing the carburettor.
14 Inlet manifold -
removal and refitting
3
Note: Refer to the warning note in Section 1
before proceeding.
Removal
1 Remove the carburettor as described in
Section 12.
2 On TU engines, drain the cooling system as
described in Chapter 1, and disconnect the
coolant hose from the base of the manifold.
3 Disconnect the brake vacuum servo hose at
the manifold.
4 Disconnect the oil filler cap breather hose
from the manifold.
5 Unbolt the oil filler tube bracket.
6 Unscrew the retaining nuts, then
manoeuvre the manifold away from the head
and out of the engine compartment. Note that
on the TU engine there is no manifold gasket.
A gasket is however fitted on XU engines. On
XU engines note the centre clamp secured by
one nut (see illustration).
Refitting
7 Refitting is the reverse of the removal
procedure, noting the following points:
a) Ensure that the manifold and cylinder
head mating surfaces are clean and dry.
Fit a new gasket on XU engines, and
apply a thin coating of suitable sealing
compound to the manifold mating surface
on TU engines. Install the manifold and
tighten its retaining nuts to the specified
torque setting.
b) Ensure that all relevant hoses are
reconnected to their original positions and
are securely held (where necessary) by
their retaining clips.
c) Refit the carburettor as described in
Section 12.
d) Where applicable, refill the cooling system
as described in Chapter 1.
Fuel/exhaust systems - carburettor models 4A•9
14.6 Inlet manifold centre clamp
on the XU engine
13.36 Choke mechanical opening
adjustment nut (4) (Weber carburettor)
4A
13.23 Throttle valve fast idle setting
(Solex carburettor)
13.34 Checking the choke mechanical
opening (Weber carburettor)
Adjust until clearance X is as specified
Adjust screw Y until clearance X is as given in
the Specifications
a Cam 3 Roller
13.26 Choke pull-down setting (using a
screwdriver to retract the diaphragm rod)
(Solex carburettor)