Carburetor Overhaul

Fig. 69 Stromberg Carburetor (Exploded View):

DISASSEMBLY
1. Remove assist spring and pump rod split pin with washer, Fig. 69.
2. Remove pump lever and split pin with washer.
3. Remove return and main springs.
4. Remove slow cut solenoid valve as follows:
a. Disconnect slow cut solenoid valve before disassembling choke chamber. Ensure not to damage solenoid valve tip.

Fig. 70 Choke Chamber Assembly:

5. Remove fast idler cam and spring
6. Remove choke chamber screw and washer.
7. Remove choke chamber assembly as follows:
a. Remove split pin (1), fast idler cam (2) and cam spring (3) from float chamber shaft, Fig. 70.
8. Remove choke and float gasket.
9. Remove float chamber assembly, float and throttle chamber gasket.
10. Remove throttle chamber assembly.

Fig. 71 Choke Chamber And Float Chamber Assembly:

11. Remove vent cover, Fig. 71.

Fig. 72 Duty Solenoid Valve:

12. Remove duty solenoid valve as follows:
a. Cut solenoid valve cord.
b. Loosen three screws holding valve in place, Fig. 72.
c. Pull valve from choke chamber. Do not remove duty solenoid valve unless repair of replacement is required.
13. Remove choke chamber, fuel nipple, fuel filter, level gauge cover, level gauge and rubber seal.
14. Remove float and collar
15. Remove needle valve.
16. Remove secondary main jet No. 170 and primary main jet No. 88.
17. Remove piston. Ensure not to lose check ball.
18. Remove pump cover, piston return spring, pump setscrew, injector spring and injector weight.
19. Remove taper plug, slow jet spring, primary slow jet No. 52, secondary slow jet No. 100, primary main air bleed No. 100 and secondary main air bleed No. 60.
20. Remove primary slow air bleed and float chamber.

Fig. 73 Throttle Chamber Assembly:

21. Remove diaphragm chamber assembly, Fig. 73.
22. Remove diaphragm chamber cover, diaphragm spring and diaphragm. Do not allow ball (1) and spring (2) to fall from diaphragm chamber vacuum hole (3) during disassembly procedure.
23. Remove idler and throttle adjusting screws.
24. Remove part Nos. 7--15, Fig. 73, only if repair or replacement is necessary.

INSPECTION
1. Clean all parts in suitable carburetor cleaner.
2. Inspect choke chamber, float chamber and throttle chamber fitting surfaces for cracks or flaws.
3. Inspect shafts and links for deformation and excessive wear.
4. Inspect float, float pin hole, float pin and needle valve and seat for excessive wear and/or damage.

Fig. 74 Diaphragm Assembly:

5. Inspect piston (1) and piston boot (2) for excessive wear and damage. Ensure not to lose check ball (3), Fig. 74.
6. Inspect slow port, idle port and other throttle chamber openings for restrictions.
7. Inspect primary throttle valve and secondary throttle valve for carbon deposits and excessive wear.
8. Inspect throttle valve shaft for wear.
9. Inspect idler adjusting screw seating surfaces for wear.
10. Inspect diaphragm for deterioration and damage.

ASSEMBLY
1. Install throttle chamber, adjusting lever, return plate and sleeve.
2. Install kick lever shaft collar, fast idler adjusting lever and screw.
3. Install spring hanger, throttle lever, throttle shaft nut and washer.
4. Install throttle adjusting screw, idler adjusting screw, diaphragm, diaphragm spring and diaphragm chamber assembly.
5. Install float chamber and primary slow air bleed.
6. Install secondary main air bleed No. 60, primary main air bleed No. 100, secondary slow jet No. 100 and primary slow jet No. 52.
7. Install slow jet spring, taper plug, injector weight and injector spring.
8. Install pump setscrew, piston return spring and pump cover.
9. Install piston, primary main jet No. 88 and secondary main jet No. 170.
10. Install float and collar.
11. Install needle valve, lever gauge and rubber seal.
12. Install level gauge cover, fuel filter and fuel nipple.
13. Install duty solenoid valve, vent cover and choke chamber.
14. Install throttle chamber assembly.
15. Install float and throttle chamber gasket.
16. Install float chamber assembly, throttle chamber screw and washer.
17. Install choke and float chamber gasket.
18. Install choke chamber assembly, fast idler cam and spring.
19. Install chamber screw and washer, pump lever and split pin with washer.
20. Install pump rod split pin with washer, return spring, assist spring and slow cut solenoid valve.