Zenith (STROMBERG) 4-Barrel Carburetors: Overhaul: Reassembly

To reassemble, reverse disassembly procedure. DO NOT primary and secondary circuit parts mixed up during reassembly. See Fig 1. When installing choke housing to carburetor body, fit choke shaft lever to bimetallic spring and pull on vacuum diaphragm shaft to make sure that choke will operate and close properly.

Fig 1: Air Bleed & Jet Locations

Courtesy of NOT AVAILABLE

1974 RX-2 & RX-3 CARBURETOR ADJUSTMENT SPECIFICATIONS

Carb. No.

Idle Speed (Engine RPM)

Float Level Setting In. (mm)

Float Drop Setting In. (mm)

Choke linkage

Accelerator Pump Stroke

Vacuum Break Diaphragm In. (mm)

Hot

Fast

On Car In. (mm)

Off Car

Man. Trans.

.....

900

.197 (5)

2.1 (55)

.046-.061 (1.2-1.6)

15.5-18.5

⁽²⁾. 7cc

.319

Auto. Trans.

⁽¹⁾ 750

.....

.197 (5)

2.1 (5).048-0.61 (1.2-1.6)

16-19°.....

⁽²⁾. 7cc

.....

.276 (7)

⁽¹⁾

In Drive.

⁽²⁾	Specification is given in cc's per stroke.

1974 RX-4 & PICKUP CARBURETOR ADJUSTMENT SPECIFICATIONS

Carb. No.

Idle Speed (Engine RPM)

Float Level Setting In. (mm)

Float Drop Setting In. (mm)

Choke Linkage

Accelerator Pump Stroke

Vacuum Break Diaphragm In. (mm)

Hot

Fast

On Car In. (mm)

Off Car

Man. Trans.

900

.....

.43 (11)

2.05 (52)

.05 (1.2)

15.5°

⁽¹⁾.8cc

.280 (7.1)

Auto. Trans.

⁽²⁾ 750

.....

.43 (11)

2.05 (52)

.054 (1.4)

17.5°

⁽¹⁾.8cc

.236 (6.0

⁽¹⁾	Per Stroke.

⁽²⁾

In "D".

1975 CARBURETOR ADJUSTMENT SPECIFICATIONS

Carb. No.		Idle Speed (Engine RPM)		Float Level Setting In. (mm)	Float Drop Setting In. (mm)	Choke Linkage		Accelerator Pump Stroke	Vacuum Break Diaphragm In. (mm)
Carb. No.		Hot	Fast	Float Level Setting In. (mm)	Float Drop Setting In. (mm)	On Car In. (mm)	Off Car	Accelerator Pump Stroke	Vacuum Break Diaphragm In. (mm)
RX-3
	Man. Trans.	800	3250	.39 (10.0)	2.05 (52.0)	.....	.069-.085 (1.75-2.16)	6.8-9.2	.130 (3.30)
	Auto. Trans.	750	3250	.39 (10.0)	2.05 (52.0)	.....	.069-.085 (1.75-2.16)	6.8-9.2	.177 (4.50)
RX-4
	Man. Trans.	800	3250	.39 (10.0)	2.05 (52.0)	.....	.069-.085 (1.75-2.16)	6.8-9.2	.130 (3.30)
	Auto. Trans.	750	3250	.39 (10.0)	2.05 (52.0)	.....	.069-.085 (1.75-2.16)	6.8-9.2	.154 (3.90)
Rotary Pickup
	Man. Trans.	800	3150	.41 (10.5)	2.05 (52.0)	.....	.057-.073 (1.45-1.85)	6.8-9.2	.177 (4.50)
	Auto. Trans.	750	3150	.41 (10.5)	2.05 (52.0)	.....	.057-.073 (1.45-1.85)	6.8-9.2	.228 (5.80)

1976 CARBURETOR ADJUSTMENT SPECIFICATIONS

Application

Idle Speed (Engine RPM)

Float Level Setting In. (mm)

Float Drop Setting In. (mm)

Choke Linkage

Accelerator Pump Stroke ⁽¹⁾

Vacuum Break Diaphragm In. (mm) ⁽²⁾

Hot

Fast

On Car

Off Car In. (mm)

All Models

Man. Trans.

800

3000-3500

.34±.04 (8.7±1)

2.05 (52.0)

.....

.067-.079 (1.70-2.0)

6.8-9.2

.169-.185 (4.3-4.7)

Auto. Trans.

750

3000-3500

.34±.04 1 (8.7±1)

2.05 (52.0)

.....

.067-.079 (1.70-2.0)

6.8-9.2

.169-.185 (4.3-4.7)

⁽¹⁾	Measured in cubic centimeters (cc). Amount of fuel that should have been drawn from container (burette) in 10 strokes.

⁽²⁾	Measured between stopper and bimetal spring lever.

1977 CARBURETOR ADJUSTMENT SPECIFICATIONS

Application

Idle Speed (Engine RPM)

Float Level Setting In. (mm)

Float Drop Setting In. (mm)

Choke Linkage

Accelerator Pump Stroke ⁽¹⁾

Vacuum Break Diaphragm In. (mm) ⁽²⁾

Hot

Fast

On Car

Off Car In. (mm)

All Models

Man. Trans.

750± 25

3200-4000

.47±.02 (12±.5)

2.13±.02 (54±.5)

.....

.067.079 (1.7-2.0)

6.8-9.2

.169-.185 (4.3-4.7)

Auto. Trans.

750± 25

3200-4000

.47±.02 (12±.5)

2.13±.02 (54±.5)

.....

.067-.079 (1.7-2.0)

6.8-9.2

.169-.185 (4.3-4.7)

⁽¹⁾	Measured in cubic centimeters (cc). Amount of fuel that should have been drawn from container (burette) in 10 strokes.

⁽²⁾	Measured between stopper and bimetal spring lever.

Fig 2: Exploded View of Zenith-Stromberg 4-Barrel Carburetor (RX-2 & RX-3)

Courtesy of NOT AVAILABLE

Fig 3: Exploded View Of Zenith-Stromberg 4-Barrel Carburetor (All Other Models)

Courtesy of NOT AVAILABLE