Subaru 1600 Service Manual page 146

3. On-car Service
Fast Idle Adjustment
NOTE:
Prior to adjustment of fast idle, ensure
that idle speed and idle mixture have
been adjusted properly.
I)
Warm up the engine sufficiently.
Ensure that the auto-choke
is
fully
open.
2)
Engage the fast idle lever with 3rd
cam latch.
3)
Adj\lst the fast idle adjusting
screw \llltil
idle
speed is
2,000
rpm.
I Cam
2 Fast idle lrver
3
I'ast
idle adJusting screw
Fig.
4-57
4. Removal
I) Air cleaner.
2) Disconnect hoses for fuel.
a. Fuel hose
b. Fuel return hose
c. Carburetor air vent hose
3) Disconnect vacuum hoses.
a. Distributor advance
b. E.G.R.
A8·422
4) Disconnect harness connectors.
5) Disconnect accelerator cable from
throttle lever.
6) Vent hose and connector with
carburetor spacer and gasket.
7) Drain coolant so as to prevent it
from !1owing out.
8)
Two carburetor attaching nuts and
carburetor.
5. Disassembly
1) Precautions
I) lise wrenches and screwdrivers of
proper size to remove nuts and screws.
Be careful not to cause burrs or
damage.
FUEL SYSTEM
2) Keep disassembled parts in order
so not to mix them up when reassem-
bling.
3) Use clean gasoline and compressed
air to clean the jets and fuel passages.
Never use a wire or cloth.
4) When cleaning carburetor, do not
put any plastic or rubber parts into the
carburetor cleaning solution. (cold
parts cleaner)
2) Removing Fuel Line
I) Choke vacuum hose.
2) Fuel line clamp (outer).
3)
Fuel line clamp (inner).
4)
Banjo lock.
S)
Banjo fuel bolt.
6) Banjo fuel line assembly and two
gaskets.
3) Removing Idle Stop
Solenoid
I) Idle stop solenoid.
2)
Fuel line bracket.
4) Removing Feedback
Solenoid and Bowl Vent
Solenoid
I) Feedback solenoid and gasket.
2) Bowl vent solenoid and gasket.
3) Pick-up armature and spring from
b()wl vent solenoid.
5) Removing Air Horn
I) Connector rod.
2) Air horn by removing seven
screws.
3) Float by pulling out float hinge
pin.
4) Air horn gasket.
5) Fuel inlet needle pin, needle pin
spring and needle.
6) Needle seat, gasket and mter.
6) Removing Metering Rod and
Accelerating Pump
I) Lifter link, metering rod and
spring.
2) Pump hose.
3) Main jet.
NOTE:
Use
Main
Jet Driver
(498167100).
4) Pump housing ASSY.
7) Separating Body Casting and
Flange
I) Pump discharge check ball and
weight.
2)
Separate body from flange by
removing four screws.
3) Flange gasket.
4) Tamper·proof pin,
S)
Idle mixture screw and spring.
6. 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) Air Horn
I) Air horn casting
Check for cracks or damage on
mating surfaces, damage on threads
and excessive wear of choke shaft and
countershaft contact areas.
2) Choke valve
Check for deformation and rust.
3) Choke shaft
Check for wear and twist.
4) Countershaft
Check for wear.
S) Float
Check for deformation, damage or
cracking, excessive wear on needle
contact area, float pin hole and pin.
6) Needle valve and seat
Check for damage and correct con-
tact between needle and seat.
7) Filter
Check for deformation and damage.
8) Choke break diaphragm
Check for cracks or other damage.
9) Choke coil
Check for rust, wear or set.
10) Accelerator pump cam
Check for cracks, wear or damage.
II) Modulation bushings and spring
Check for excessive wear and insure
parts more freely.
12) Fast idle cam bushing
Check for excessive wear.