Navigation bar
  Start Previous page  39 of 40  Next page End Home  

damage to nozzle tubes and nozzle tube ex tensions. halfway between these two points will result in a
body and install the two main body to throttle body 
screws and lockwashers.
Care should be exercised in aligning nozzle 
tube extensions to receive nozzle tubes. 
This will insure a proper fit between the 
main body and throttle body and prevent 
2. Install the pump link stud, new pump link, 
and new pump link cotter or retainer.
weather operation and the inner hole pro
vides a minimum pump discharge for hot 
weather. For most driving conditions, the
middle hole should be used.
3. Place a new main body cover gasket in 
position on the main body and install the main body 
cover to the main body with the four main body 
cover screws and lockwashers. On governor 
equipped carburetors, fasten the governor vent 
tube in position under the proper main body screw.
4. Install the air cleaner anchor screw and 
bleeder screen washer.
Three holes in the throttle lever permit 
adjustment of the accelerating pump dis
charge. The outer hole provides a maxi
mum pump discharge for extreme cold
Install the fuel filter screen retainer spring, 
new filter screen assembly, and fuel inlet fitting 
with a new fuel inlet fitting gasket.
Before installing a carburetor, make a visual 
inspection of its exterior to be sure the unit has 
not been accidentally damaged due to improper 
storage or mishandling.
Be sure the carburetor mating surface of the 
intake manifold is clean. Then, using a new flange 
gasket, secure the carburetor to the intake mani
fold with the four mounting nuts and lockwashers. 
Tighten the mounting nuts alternately, a little at 
a time, to evenly compress the flange gasket. The 
nuts must be drawn down tight to prevent leakage 
between the carburetor and manifold. Connect the 
distributor vacuum line, the fuel line, and throttle 
and choke linkages, making sure there are no worn 
or loose connections. Connect the governor air 
lines on the truck carburetors.
of "Reassembly - Throttle Body - Governor 
Equipped Carburetors".
Do not seat the idle adjusting needles too 
tightly as this will grove the tips of the 
needles and prevent a smooth idle. If the 
needles become grooved, they must be 
discarded and replaced with new ones.
3. Start the engine and allow the olwrA!„i~: 
temperature to reach normal. Reset the idle slxoed 
screw if necessary to obtain an idle rpm fast 
enough to prevent stalling during the warm-up 
4. With the choke plates wide open and the 
fast idle cam on passenger car carburetors in the 
position where the idle speed screw contacts the 
lowest step of the cam, adjust the idle to the speci
fied rpm with the idle speed screw.
A. Adjusting the Idle
1. Make sure the vehicle is on level ground.
2. Seat idle adjusting needles lightly and 
back them off exactly one full turn if there is any 
doubt about this having been done during reas
sembly. See Step 3 of "Reassembly - Throttle 
Body - Passenger Car Carburetors", or Step 8
5. Set the idle adjusting needles to give the
highest steady manifold vacuum reading, or the 
smoothest running and maximum idle speed, if no 
vacuum gage is available.
This can be ac com
plished by turning one idle adjusting needle in un
til the engine begins to slow down, then backing
needle off over the "high spot" until it again begins 
to slow down. Setting the idle adjusting needle 
Previous page Top Next page