8-15
Carburetor Overhaul
(Does Not Apply to Spec D and Later)
Carburetion problems that cannot be corrected by
mixture screw adjustments are usually a result of
gummed-up fuel passages or worn internal parts.
The most effective remedy is a complete carburetor
overhaul.
Overhauling a carburetor consists of complete dis-
assembly, a thorough cleaning, and replacement of
worn parts. The carburetor repair kit includes new
gaskets and replacements for the parts that are
most subject to wear.
Carefully note the location of carburetor parts for
correct reassembly. Review these instructions be-
fore starting. The carburetor components are illus-
trated in Figure 8-12.
Gasoline fuels deteriorate over time causing fuel
system corrosion and the formation of gum and var-
nish-like deposits. If the genset will not be operated
for more than 120 days, a fuel preservative and sta-
bilizer such as OnaFresh
TM
should be used to pro-
tect the fuel system. Follow the label instructions for
using a fuel additive.
WARNING
Gasoline is extremely flammable.
Severe personal injury or death can result if it is
ignited. Eliminate all possible sources of igni-
tion including fire, flame, spark, pilot light, ciga-
rettes, arc-producing equipment, electrical
switch, or other ignition sources before per-
forming this procedure.
Removal and Disassembly:
Remove the carbure-
tor and intake manifold assembly, as specified in the
Carburetor and Intake Manifold Assembly
on Page
8-12. Remove the carburetor from the intake man-
ifold. Carburetor parts are fragile and they must be
handled with care. Never force a part when disas-
sembling or assembling. Disassemble the carbure-
tor as follows:
1. Remove the main and idle mixture screws.
2. Separate the lower section of the carburetor.
Remove the float chamber and gasket by re-
moving the chamber set plug.
3. Slide the float pin out of the float passage. Re-
move the float and float valve.
NOTE: The throttle plate screws are secured
with epoxy. Do not remove the choke or throttle
plates, shafts, arms or governor link bushing
unless they are defective.
MAIN
ADJUSTMENT
SCREW
IDLE MIXTURE
ADJUSTMENT
SCREW
THROTTLE
STOP
SCREW
FLOAT
CHAMBER
FS1807-1s
FLOAT
FLOAT
PIN
FLOAT
VALVE
GASKET
WASHER
CHAMBER
SET PLUG
SPEC A
MODELS
ONLY
LIMITER
CAP
FUEL SHUTOFF
SOLENOID (E3)
BEGIN SPEC B
MODELS
FIGURE 8-12. CARBURETOR OVERHAUL
(PRIOR TO SPEC D)
OnaFresh is a trademark of Onan Corporation.
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