GMC 1976 ZEO 6083 Maintenance Manual page 700

CRANKCASE BREATHERHOSE
TO AIR INTAKE
Figure 32-Fuel System (Typical)
REPLACING NEEDLE AND VALVE SEAT
(FIGURE 33)
1 . Remove 7/16" retainer at base of fuel bowl and
lift bowl from carburetor .
2. Push out pin that holds float to carburetor
body . Disconnect spring holding needle to float.
3 . Remove float and set aside in a clean place.
Pull out needle and using a large screwdriver remove
needle valve seat .
4. Install new valve seat and needle and replace
float.
5 . Adjust float.
CARBURETOR CLEANING AND
INSPECTION
To clean the carburetor, soak all components
thoroughly in a good carburetor cleaner, following
the manufacturer's instructions . Be sure to remove
all carbon from carburetor bore, especially in the
area of the throttle valve. After soaking, clean out all
passages with filtered, compressed air .
Check the adjusting needles and nozzle for dam-
age. If float is loaded with fuel or damaged, replace
it . The float should fit freely on its pin without bind-
ing.
Check the choke and throttle shafts for excessive
side play and replace if necessary.
CARBURETOR FLOAT ADJUSTMENT
1 . Invert float and casting.
2. With the float resting lightly against the needle
and seat, there should be 3/32-inch clearance be-
tween base of float and carburetor casting.
A-1623
ONAN MOTOR GENERATOR
24C- 2 3
Figure 33-Carburetor Components
NOTE: A drill bit can be used for this measure-
ment as shown in Figure 34 . Use a 3/32-inch
drill bit .
3. If it is necessary to reset float level, remove the
float from carburetor and bend the float tang, near
the pin, to obtain correct float level.
CAUTION: Do not bend the float when in-
stalled; doing so may cause deformation of
needle or seat.
4. Check the float closely for signs of leakage.
Replace float if damaged or filled with gasoline .
5. Before assembling carburetor, remove filter
screen from float bowl and clean both screen and
base of float bowl .