Stewart Carburetors
In the case of a carburetor which has been in service for some
little time and is being disassembled for cleaning, it may be
advisable to install new gaskets at the strainer connection,
the throttle body connection, and the gear housing. It is also
desirable to tighten slightly the packing gland which surrounds
the pinion shaft.
This is accomplished by first loosening the lock nut and then tightening
the packing nut, which has right-hand thread. This, however, should
never be so tight as to prevent the adjustment arm spring returning
the arm to the point of the screw.
It is not necessary to remove the adjustment armfrom the pinion
shaft, thereby changing the adjustment of the carburetor, when
the instrument is being disassembled for cleaning.
Do Not Alter the Specifications of
Carburetor
The weight of the metering valve, size of jet, taper of metering
pin and various clearances of the metering valve in the body, etc.,
have been very carefully worked out to suit the requirements of
the Dodge Brothers engine. None of these details should he in any
way altered, as satisfactory results cannot be obtained if this
is done.
STEWART CARBURETOR USED ON HUPMOBILE 6, MODEL A-1
This carburetor is similar to the one shown in Fig. 1.
The action of the carburetor, adjustments and other details, explained
on preceding pages will applyto the Stewart carburetor used on
the Hupmobile 6. The Dodge has a side or horizontal outlet, and
this carburetor (Fig. 2) has a top or vertical outlet. The fundamental
principles of the working parts are the same.
Name of Parts
A, fuel supply connection; B, strainer; C, float chamber; D, gasoline
needle valve; E, float; F, counterweight levers; G, gasoline passage;
H, dashpot chamber; I, gasoline passages; J, gasoline passage;
K, dash adjustment lever; L, dashpot piston; M, metering valve
head; N, metering valve stem; 0, aspirating tube or nozzle; P,
primary air passages; Q, metering valve seat; R, mixing chamber;
S, fuel metering orifice; T, metering pin rack; U, adjustment lever
clamp screw; V, adjustment, screw; W, metering pin; X, gear housing;
Y, pinion shaft,; Z, low throttle stop screw; AA, strainer plug;
BB, air inlet; CC, throttle valve.
Gasoline float-level adjustment of all Stewart carburetors is '.a" below
the top of the float bowl with the float cover off and the measuring
scale depressing the float until the gasoline meets the scale.
To make adjustment: Unsolder collar on gasoline needle valve. Moving
collar up lowers the level, moving it down raises the level. Resolder
collar after adjusting.
Fig. 2. Stewart model "25" carburetor, 1" size,
with rack and pinion dash adjustment used on Hupmobile-6 (Model
A-1). Top or vertical outlet.
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