Onan T260G Service Manual page 18

Removal Cleaning and Repair
1. Remove air cleaner and hose.
2. Disconnect governor and throttle linkage, choke
control and fuel line from carburetor.
3 . Remove the four intake manifold cap screws and lift
complete manifold assembly from engine.
4. Remove carburetor from intake manifold.
Disassembly (Walbro)
1. Remove throttle and choke plate retaining screws,
then plates. Pull out throttle and choke shafts.
2. Remove main jet and idle adjustment needle.
3.
Remove attaching screws and separate upper and
lower carburetor sections.
4. Carefully note position of float assembly parts, then
pull out retaining pin and float assembly.
5. Remove needle and unscrew needle valve seat.
Disassembly (Nikki limited idle adjustment)
1.
Remove main jet and idle adjustment needle.
2. Remove attaching screws and separate upper and
3 . Carefully note position of float assembly parts, then
4. Remove needle valve.
lower carburetor sections.
pull out retaining pin and float assembly.
BEND FLOAT
0.02 0.02 INCH
TANG HERE
(0.51 0.51
mm)
TO ADJUST
FLOAT LEVEL ADJUSTMENT
.0512" .028"
FLOAT LEVEL ADJUSTMENT
1. Soak all metal components not replaced in car-
buretor cleaner. Do not soak non-metal floats or
other non-metal parts. Follow the cleaning manu-
facturer's recommendations.
2. Clean all carbon from the carburetor bore, especially
where the throttle and choke plates seat. Be careful
not to plug the idle or main fuel ports.
3 .
Dry out all passages with low pressure air
(35
PSI).
Avoid using wire or other objectsfor cleaning which
may increase the size of critical passages.
4. Check the condition of the adjustment needle;
replace if damaged. Replace float if loaded with fuel
or damaged.
5. Check the choke and throttle shafts for excessive
play in their bore. This condition may necessitate
replacement of the carburetor.
6. Replace old components with new parts.
I
FUEL LEVEL
0.25 INCH
(6.35 mm)
BEND FLOAT ARM
HERE TO ADJUST
FLOAT DROP
MINIMUM
0.20 INCH
(5.08 mm)
WITH FUEL
WALBRO CARBURETOR
FUEL LEVEL
. 4 7 2
(12.0 mm)
WITH FUEL
NlKKl CARBURETOR
NO FUEL
FS-1524
FLOAT DROP BEND FLOAT ARM
2913" HERE TO ADJUST
MINIMUM
NO FUEL
FS-1683
FIGURE 4. CARBURETOR FLOAT LEVEL ADJUSTMENTS
7-3