Wh'en the casing is removed care must be taken to see that the wires are
not brok'en, and particularly that the top wire does not come across th'e
rocking contact plate
(M).
A simple test for the contacts being in working
order, providing the bottom plunger has not stuck, is to remov'e the cap
(V)
from th'e top of th'e pump and
lift
the float
(R)
up and down its full stroke.
If listened for int'ently the rocker plate can be heard to click as
it
breaks thse
contact.
If
after being re-assembled thse pump works, but does not deliv'er petrol,
it should be primed by pouring a small quantity of petrol
into the top
chamber.
If
petrol is not available
a
few squirts of thin oil down the tube of
th'e pump after removing the Float
(R)
and top plunger
(K)
will have the
same effect.
Please
notle the oil must be thin.
The Petrol Pump is unconditionally guaranteed (except for obvious
mishandling)
by the makers, The
S.U.
Carburetter Co. IJtd., East Works,
Bordsley Gr,een Road, Adderley Park, Birmingham, to whom all queries
should be addressed.
SUCTION DISC
PISTON
TAPER JET NEEDLE
JET LEVER
JET ADJUSTING NUT
JET HEAD
FLOAT
FLOAT
FLOAT
CHAMBER
NEEDLE
The
Carburetter.
The functioning of the carburetter can be followed in
detail by reference to illustration. The petrol flow to the jlet is governed by
a
float mechanism of orthodox type, where the rising petrol lifts the float,
forcing it against weighted levers engaging in
a
collar at the upper end of
a
needle. The lower end of the needle terminates in a cone that engages in
the conical orifice of the petrol feed pipe, upon which it is forced by the
action of the weighted levers, thereby shutting off the petrol supply whmen
the petrol lever in the float-chamber has reached a pred'etermined level. The
weighted levers are att~lched to the lid of the float-chamber and the lid can
readily be detached after sliding the retaining spring catch to one side.
P'etrol from the float-chamber is led to a jet, the size of whose orifice-
and consequent delivery-is regulat,ed by means of a tapened needle attached
PAGE
FIFTY-SIX
J)/I
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