Subaru 1600 Service Manual page 136

3. Removal
1) Air cleaner.
2) Disconnect hoses for fuel.
a. Fuel hose
b. Fuel return hose
c. Carburetor air vent hose
3) Disconnect vacuum hoses.
a. Main diaphragm
b. Distributor advance
c. E.G.R.
d. Retard (All California models and
non-4WD of non-California models)
4) Disconnect hoses for duty sole-
noid valves. (All California models and
non-4WD of non-California models)
a. Duty solenoid valve (slow)
b. Duty solenoid valve (main)
5) Disconnect hoses.
a. Main diaphragm
b. Secondary main air bleed (High
altitude configuration only)
6) Duty solenoid valve connector
clamp. (All California models and non-
4WD of non-California models)
7)
Disconnect harness connector.
8) Disconnect accelerator cable from
throttle lever.
9) Drain coolant so as to prevent it
from flowing out.
10) Four carburetor attaching nuts
and carburetor.
NOTE:
After removal, cover the area on the
intake manifold where the carburetor
was installed, in order to prevent dust
from entering into the engine.
4. Disassembly
1)
Precautions
1) Use wrenches and screwdrivers of
proper size to remove nuts and screws.
Be careful not to cause burr or dam-
age.
2) Keep disassembled parts in order
not to mix them up when reassem-
bling.
3) Use clean gasoline and compres-
sed air to clean the jets and fuel
passages. Never use a wire or cloth.
2) Removing Linkage
I) Throttle return spring.
2) Pump lever shaft, pump lever,
FUEL SYSTEM
spring, washer and spring washer.
3) Cam connecting rod, cotter pins
and washers.
NOTE:
Leave pump connecting rod as it is.
3)
Removing Choke Chamber
1) Return spring of return plate.
2) Unclamp harness at two points.
3) Anti-dieseling switch.
NOTE:
Be careful not to lose the 12.2 mm
washer.
4)
Choke chamber, gasket and five
screws.
NOTE:
Since the choke chamber is fitted with
a float, take care not to damage the
float.
4)
Separating Float Chamber
and Throttle Chamber
1) Snap ring of secondary diaphragm.
2) Secondary diaphragm, gasket and
three screws.
3)
Separate float chamber and
throttle chamber by removing three
screws.
NOTE:
a. Be careful when putting the float
chamber upside down because some
parts (spring, bailor injector
weight) may drop off.
b. Be careful not to damage the
longest screw, since
it
has a hole
which is vacuum passage for the
power valve.
5)
Disassembling Choke
Chamber
I) Accelerating pump piston and
pump cover.
2) Float shaft and float.
3)
Needle valve.
NOTE:
Be careful not to lose the 10 mm
washer.
4) Primary and secondary slow air
bleeds.
5) Switch vent solenoid valve, gasket
and three screws.
4_14
6) Disassembling Float
Chamber
1) Piston return spring, ball and
injector weight.
2) Primary and secondary main air
bleeds.
3) Primary and secondary plugs and
slow jets.
4) Lock plate, float chamber drain
plugs and primary and secondary main
jets.
NOTE:
Be careful not to lose the 9 mm
washers.
5)
Power valve.
NOTE:
Be careful not to lose the
8
mm
washer.
7)
Disassembling Throttle
Chamber
1)
Throttle adjusting Screw and
spring.
2) Idle adjusting screw and spring.
NOTE:
Remove spring pin beforehand.
3)
Nut and parts on throttle valve
shaft.
NOTE:
Keep the disassembled parts in order.
5. Inspection
Disassembled components should
be washed in clean gasoline before
inspection. Particularly small holes and
hollows such as fuel passage must be
blown with compressed air to remove
dust and dirt.
Do not use drills or wires to clean
the small passages, otherwise the car-
buretor performance may be adversely
affected due
to
cut or deformation.
1)
Choke Chamber
1)
Air horn
Check for cracks, damage on
mating surfaces, damage on threads,
and excessive wear of choke valve
shaft contact areas.
2) Choke valve
Check for deformation and rust.
3) Choke valve shaft