Automotive Carburetion Made Easy
UM-900 (1952)
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SERVICE HINTS
Before carburetor
service can be properly performed, it must be remembered that
CARBURETION IS DEPENDENT UPON
COMPRESSION, IGNITION, SPARK TIMING, VALVE TIMING, ETC THE
CARBURETOR SHOULD ALWAYS BE
SERVICED AND ADJUSTED LAST IN AN ENGINE TUNE-UP.
The following list
may be of assistance in determining the source of carburetor trouble
after the engine has been tuned:
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1. IDLE SYSTEM (Rough idle, stalling)
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a. Is the engine idle
speed properly adjusted?
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b. Are the
idle channels free of carbon or obstruction?
c. Is the
throttle body bore free of carbon deposit?
d. Is the engine manifold heat valve free?
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e. Are the idle
adjusting needles free of burrs?
f.
Is the float setting
correct?
g. Is the top of the float needle smooth?
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2. PART THROTTLE SYSTEM (Poor economy, surge)
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a. Are the fuel
channels free of dirt or obstruction?
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b. Are the main
metering jets of proper size and approach angle?
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C. Are the main well tubes bent or loose?
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8
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