WSM.124
Section C (Fuel System)
(c) Check that main met.ering jet is as specified and
that It is properly tightened.
(d) On WIA carburettors check that by-pass valve
is not sticking or leaking. If this occurs too
much fuel will be fed to the main discharge jet
under part throttle conditions. The valve
assembly must be removed and any foreign
matter removed by blowing through the valve
orifice.
(e) Check that the gaskets between the carburettor
bodies and both sides of the by-pass valve
operating diaphragm on WIA carburettors are
not allowing air leakage. The condition of the
diaphragm should also be checked.
If air leaks exist the diaphragm return spring
can open the by-pass valve too early which will
allow too much fuel to be supplied under
cruising (part throttle) conditions.
(f) Check that the ball beneath the screw securing
the pump discharge nozzle is in position. See
Fig. 13. It can easily be lost in dismantling the
carburettor if the· body is Inverted after
removal of the screw securing the pump
discharge nozzle, or If the accelerator pump Is
operated with the screw removed.
If the carburettor has been assembled without
this ball or if there is dirt under the ball or the
ball seating faulty, the manifold depression may
at certain speeds draw fuel from the pump
nozzle. This will, of course, increase the fuel
consumption.
With the air intake elbow removed it is possible
to see the pump discharge nozzle and if the
engine is run at a high speed no fuel should
come from the nozzle after completion of the
accelerator pump stroke.
(g) Check that the fuel level In the float chamber
is correct.
Page 21
Insufficient top speed
(a) See that throttle valve is opening fully over
the range provided by the particular carburettor
stop plate arrangement.
(b) Check the fuel supply to the float chamber.
Fuel pump output pressure should be checked.
A condition can arise when, due to worn fuel
pump linkage or improperly titted pump, the
pump output is too low under full throttle
conditions.
(c) On WIA carburettors see that the by-pass jet
is clear and of the specified size. To do this the
by-pass valve must be removed from the float
chamber, but no attempt must be made to
remove the jet orifice cup from the valve body.
The jet number is stamped on the hexagon of
the body.
Bad slow running
(a) Check the synchronisation of the throttles and
reset the slow running volume control screws
as described later in this section under
ADJUSTMENTS. If slow running cannot be
correctly set check each carburettor for the
following possible causes.
(b) Check that the idle jet is clear.
(c) Blow through the slow running system
passages with clean compressed air.
(d) Ensure that the joint titted between the top
part of the carburettor and the float chamber
is correctly titted. Air must not leak Into the
slow running system passageways.
(e) Make certain that the screws securing the
throttle barrel to the main body of the car
burettor are tight, and that the hole is clear
which carries the mixture through the main
body, heat Insulator, and throttle body. A
Summary of Contents for ALPINE I SERIES: APLINE II SERIES
Page 1: ......
Page 189: ...Fis 21 Ball pin heirht checkinr fixture in position Details of items 1 to 4 In Fig 22...
Page 208: ...Fla 3 Exploded view of rear axle Hypoid Bevel Drive...
Page 220: ...Page 16 WSM 12 f Section G Rear Axle 0 QQ I I I I I t 0 ii 8 ts t 0 Cl 2 i J...
Page 247: ...Page6 WSM 124 Section J Steering N Iii it...
Page 299: ...Page 40 3 6 7 8 Fis 22 Se rvo unit exploded view Sect WSM 124 ion K Brakes 18 419 GZo 21...
Page 413: ..._ PRINTED IN ENGLAND 9Y WREN PRINTING CQ LTD LONDON...