The ABCs of Carburetion

UM-900 (1959)

 

Page 18 of 19

IMPORTANT ADJUSTMENTS Continued
ON THE ENGINE
SLOW IDLE—The slow idle setting is an im­portant factor in smooth idling and stalling after engine warm-up. Therefore, it should be adjusted carefully according to factory speci­fications with the use of a tachometer and vacuum gauge.
AUTOMATIC CHOKE STOVE - Rochester Automatic choke carburetors for Chevrolet application require the use of a choke stove assembly and heat pipe. For proper choke operation, this stove must be properly installed. Install on forward side of exhaust manifold. Do not insulate steel heat pipe. The recom­mended installation gives best results with factory calibrated parts.
FAST IDLE—The final fast idle adjustment should always be made on the engine with the use of a tachometer. Adjust according to fac­tory specifications. If improperly adjusted, it may result in hard starting when cold, stalling or loading up.
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TOOLS AND SPECIFICATIONS ARE AVAILABLE THROUGH UNITED MOTORS SERVICE
Since service adjustments on all models of Rochester Carburetors have been kept to a minimum, the number of special tools and gauges required for field service adjustments
are comparatively few. The necessary tools and gauges are available through the facilities of United Motors Service Distributors every­where.
CAUTIONS
1.  The practice of indiscriminately installing lean main metering jets to improve economy is without basis. Lean jets are intended for high altitude use only and will not improve mileage at average or sea level altitudes. Excessively lean jets may result in burned engine valves.
2.  Mileage complaints should always be veri­fied with a gas-per-mile gauge with the owner driving. Many factors, other than carburetion, affect mileage.
3.  As mentioned before, CARBURETION SHOULD ALWAYS BE CHECKED LAST IN ENGINE TUNE-UP.
4.  Do not remove throttle valves or shafts
from Rochester Carburetors. All idle drill­ings are made with relation to a proper fit­ting valve. Since removing and replacing the valve will change this relationship, rough or erratic idling may be the result.
Be certain all carburetor adjustments are made in proper sequence according to factory specifications.
Always remember-DIRT IS A CARBU­RETOR'S WORST ENEMY. A good clean­ing job will often result in a satisfied cus­tomer. Always remove gum deposits with a good gum solvent. In many instances it may be advisable to install a fuel filter to minimize dirt deposits.
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