Carter-Weber Carburetor, Adjustment Procedures
83subaru1NUMBER 09-16-83
DATE 03-21-83
APPLICABILITY 1982 AND 1983 VEHICLE UTILIZING A CARTER-WEBER
CARBURETOR
SUBJECT: ADJUSTMENT OF THE CARTER-WEBER CARBURETOR
When disassembling a 1982 (7419-S) or a 1983 (7569-S) Carter-Weber Carburetor for repairs it is necessary to check the following items to ensure they are set to the proper specifications. This bulletin is provided for your information when Carter Carburetor repairs are necessary.
Steps 1 thru 8 are performed with either the carburetor removed and/or installed with engine off..
FIGURE 1:
1. FLOAT ADJUSTMENT - (Refer to Figure 1)
With the bowl cover inverted and the float resting on its own free weight, the distance from the bowl cover gasket to the notch on the outer end of float should be as specified. Adjust by bending float arm.
FIGURE 2:
2. FLOAT DROP - (Refer to Figure 2)
With bowl cover assembly held in upright position, the distance between the top of the float at notch on outer end of float and the bowl cover gasket should be as specified. Adjust by bending the stop tang on the float lever.
FIGURE 3:
3. ENGINE OFF THROTTLE STOP SCREW - (Refer to Figure 3)
With the choke fully open, turn the adjusting screw clockwise until it just contacts the throttle lever, then continue one complete turn. This adjustment should be made before pump and metering rod adjustment.
FIGURE 4:
4. ACCELERATOR PUMP - (Refer to Figure 4)
Pump adjustment must be made before metering rod adjustment. Remove welch plug. With throttle valve wide open (diaphragm in its upper position), use a dial indicator or suitable tool to gauge through the hole in the bowl cover and measure the distance from the bowl cover to the top of the pump. Then close the throttle and measure the downward pump travel. Adjust pump travel to specifications by bending the link. A new welch plug should be installed, in the bowl cover opening.
FIGURE 5:
5. METERING ROD - (Refer to Figure 5)
THIS ADJUSTMENT SHOULD BE CHECKED ONLY AFTER ACCELERATOR PUMP IS PROPERLY ADJUSTED.
Metering rod adjustment should not normally be required, if adjustment must be made, the tamper-resistant plug can be driven out from inside the bowl cover over the metering rod.
Specifications give the distance the metering rod should be off of its bottomed position at idle.
Use a dial indicator or suitable tool to gauge through the hole in the bowl cover. Pushing the metering rod downward to its bottomed position, measure the distance from the bowl cover to the top of the metering rod adjustment screw. With throttle closed and the metering rod spring lifting the rod to its upper position, the amount of lift from the bottomed position should be as specified. To adjust, rotate adjusting screw with a torx head, T-9 driver. After adjustment install tamper-resistant plug.
FIGURE 6:
6. CAM INDEX - (Refer to Figure 6)
With fast idle screw on second step of the fast idle cam, against shoulder of the first step, close choke valve as far as possible. The dimension between the lower edge of the choke valve and the wall of the air horn should be as specified. Adjust by bending tab.
FIGURE 7:
7. UNLOADER - (Refer to Figure 7)
Hold the throttle valve in wide open position and close the choke valve as far as possible without forcing. There should be clearance as specified between the lower edge of the choke valve and the inner wall of the air horn. Adjust by bending the tab.
FIGURE 8:
8. CHOKE PULL-OFF- (Refer to Figure 8)
Remove tamper resistant plug.
Hold the throttle valve in wide open position and close the choke valve as far as possible without forcing.
Seat diaphragm by using an outside vacuum source. Apply a light closing pressure to the choke valve to move the valve toward the closed position as far as possible without forcing. The dimension between the lower edge of the choke valve and air horn should be as specified. To adjust, use the adjusting screw located in the diaphragm housing. After adjustment is made, replace tamper resistant plug.
FIGURE 9:
9. FAST IDLE ON CAR - (Refer to Figure 9)
With a warm engine and the fast idle screw on second step and against shoulder of the first step of the cam, adjust the fast idle screw to 1700 RPM.
FIGURE 10:
10. IDLE SOLENOID - (Refer to Figure 10)
With engine running and solenoid activated, adjust hex nut on the solenoid plunger to specified R.P.M.
FIGURE 11:
11. F.I.C.D. (FAST IDLE CONTROL DEVICE) - (Refer to Figure 11)
Turn on air conditioner system, when A/C clutch is engaged the F.I.C.D. is activated. With F.I.C.D. activated, adjust to specifications listed in applicable Subaru Service Manual.
CARTER CARBURETOR ADJUSTMENT SPECIFICATIONS (INCHES)
1982 (7419-S) 1983 (7569-S)
FLOAT .670 +/- .015 .670 +/- .015
FLOAT DROP 1.6" 1.6"
PUMP .150 +/- .007 .150 +/- .007
METERING ROD .050 +/- .005 .050 +/- .005
CHOKE PULL-OFF .110 +/- .004 .110 +/- .010
CAM INDEX .100 +/- .004 .100 +/- .010
UNLOADER .320 +/- .010 .350 +/- .020
IDLE SPEED M/T 700 RPM +/- 100 M/T 700 RPM +/- 100 RPM
F.I.C.D. M/T * 950 RPM +/- 50 M/T 950 RPM +/- 50 RPM
*(WHILE A/C SYSTEM OPERATES WITH A/C CLUTCH ENGAGED).
NOTE: This bulletin is supplied for informational purposes only.