Carburetor - Surging After Hot Restart
83subaru1NUMBER 11-16-83
DATE 06/06/83
APPLICABILITY 1983 (49S LDT) 4WD VEHICLES PRIOR TO
ENGINE NO. AND PRODUCTION DATE LISTED BELOW.
SUBJECT: INSTALLATION PROCEDURES FOR FCV KIT (483367200)
ALL ENGINES IN 1983 49 STATE 4WD VEHICLES WERE FITTED WITH A FLOAT CHAMBER VENT SYSTEM BEGINNING WITH DECEMBER, 1982 PRODUCTION.
THE STARTING ENGINE NUMBERS FOR THIS PRODUCTION CHANGE ARE AS FOLLOWS
4WD M/T 177817
4WD A/T 176554
FIGURE 1:
THIS FLOAT CHAMBER VENT SYSTEM OPENS ATMOSPHERIC PRESSURE TO THE FLOAT CHAMBER WHEN AMBIENT UNDERHOOD TEMPERATURES EXCEED A SPECIFIED TEMPERATURE OF 140~F. AT THE SAME TIME, FRESH AIR IS FED FROM THE AIR CLEANER INTO BOTH THE SLOW AND MAIN CONTROL AIR PASSAGES OF THE CARBURETOR.. SEE FIGURE 1.
A KIT IS AVAILABLE (PART NO. 483367200) FOR INSTALLATION ON EARLY PRODUCTION 1983 49 STATE 4WD VEHICLES WHICH EXPERIENCE A COMPLAINT OF HOT RESTART DRIVEABILITY (SURGING). INSTALLATION OF THE KIT CAN BE CLAIMED ON A MSA 400 USING THE OPERATION NUMBER AND TIME LISTED BELOW:
*083-100 0.5
THE INSTALLATION INSTRUCTIONS FOR THE FCV KIT ARE ATTACHED TO THIS BULLETIN.
INSTALLATION OF A HIGH ALTITUDE KIT ON VEHICLES FITTED WITH THIS SYSTEM WAS ADDRESSED IN SERVICE BULLETIN NUMBER 11-15-83, DATED 4-12-83. REFER TO THAT BULLETIN WHEN INSTALLING THIS SYSTEM ON A VEHICLE ALREADY FITTED WITH A HIGH ALTITUDE KIT.
FIGURE 1:
INSTALLATION PROCEDURES FOR FCV KIT (483367200) 1983 (49S LDT) 4WD VEHICLES FCV KIT CONTENTS
1v) Vacuum Switch Valve
2v) Bowl Vent Vacuum Valve and Clip
3v) Temperature Valve Assembly
4) Cap (3)
5) Small Vacuum Tee (2)
6) Large Vacuum Tee (2)
7) Clamps (8)
8) Temperature Valve Bracket
9) Temperature Valve Insulator
10) Bolt and Washer (3)
11) Hose 4 x 9 x 30 (2)
12o) Hose With Orifice
13o) Hose With Orifice
14) Hose 5.5 x 12
15) Hose 4 x 9 x 25 x 410
16) Hose 4 x 9 x 25 x 540
17) Hose 4 x 9 x 25 x 135
18) Hose 5.5 x 240
19) Hose 5.5 x 12 x 100 x 80
20) Hose 4 x 9 x 25 x135
21) Hose 5.5 x 12
Preassemble FCV kit on bench as shown in Figure 1.
FIGURE 2:
Install FCV kit on vehicle as follows:
1. Remove spare tire and air cleaner assembly from vehicle.
2. Install temperature valve assembly onto manifold where shown in Figure 2. Torque the bolts to 18 ft.lbs.
FIGURE 3:
3. Remove original vacuum hose from manifold to air suction valve and install new hose number 15 where shown in Figure 3.
FIGURE 4:
4. Install new hose number 16 to air suction valve.
5. Remove plug from float bowl vent on carburetor and install new hose number 18 where shown in Figure 4.
FIGURE 5:
6. Remove plug from front of carburetor and install new hose number 14 where shown in Figure 5.
7. Remove plug from carburetor top and install new hose number 21 where shown in Figure 5.
8. Remove plug from bottom of air cleaner and install new hose number 19 where shown in Figure 5.
Route all hoses carefully through engine compartment. Secure valve (2v) onto PCV hose with holder (clip) supplied.
Reinstall air cleaner assembly and spare tire.
Confirm proper operation of bowl vent system.