PLYMOUTH 1939-1941
Models P-7, P-8, P-9, P-10, P-11, P-12, T-125
Buy a carburetor kit for this carburetor.
Models P-7, P-8, P-9, P-10, P-11, P-12, T-125
Buy a carburetor kit for this carburetor.
Dimensions:
Flange 1 1/2"
Throttle bore 1 9/16"
Main venturi 1 1/4" I.D.
Float Setting: Top of float 5/64" +- 1/64" below top of surface of carburetor body casting. You can fudge a bit higher due to the ethanol gasoline.
Set Idle Adjustment Screw - 1/2 to 1 1/4 turns open. For richer mixture, turn screw out. Do not idle engine below 300 RPM.
Flange 1 1/2"
Throttle bore 1 9/16"
Main venturi 1 1/4" I.D.
Float Setting: Top of float 5/64" +- 1/64" below top of surface of carburetor body casting. You can fudge a bit higher due to the ethanol gasoline.
Set Idle Adjustment Screw - 1/2 to 1 1/4 turns open. For richer mixture, turn screw out. Do not idle engine below 300 RPM.
Main Metering Jet Calibrated to flow 254 to 258 cc per minute.
Main Vent Through diffuser (air bleed inside bowl) size .0315" (.80 mm) drill
Step Up Jet - #63 (.94mm) drill size.
Accelerating Pump - Stroke, summer setting (inner hole, short stroke), intermediate setting (center hole), winter setting (outer hole, long stroke). Due to the ethanol polluted gasoline, you may have to experiment with this.
Pump Discharge Jet Size - .0315 inch (.80 mm) drill. Due to the ethanol you may need to enlarge this by .001. Do this only if you have a lean condition.
Pump Adjustment - 3/8" plunger travel (center hole).
Main Vent Through diffuser (air bleed inside bowl) size .0315" (.80 mm) drill
Step Up Jet - #63 (.94mm) drill size.
Accelerating Pump - Stroke, summer setting (inner hole, short stroke), intermediate setting (center hole), winter setting (outer hole, long stroke). Due to the ethanol polluted gasoline, you may have to experiment with this.
Pump Discharge Jet Size - .0315 inch (.80 mm) drill. Due to the ethanol you may need to enlarge this by .001. Do this only if you have a lean condition.
Pump Adjustment - 3/8" plunger travel (center hole).
Adjustments
Carburetor Loading Up
Check float level. Wear on lip of float lever will raise float level. Before adjusting, be sure the float lever pin is firmly seated. Reset the float level by bending lip of float lever away from needle to raise level or bend lip toward needle to lower float level. Bend vertical lip of float only. DO NOT PUT PRESSURE ON NEEDLE VITON TIP.
Check float level. Wear on lip of float lever will raise float level. Before adjusting, be sure the float lever pin is firmly seated. Reset the float level by bending lip of float lever away from needle to raise level or bend lip toward needle to lower float level. Bend vertical lip of float only. DO NOT PUT PRESSURE ON NEEDLE VITON TIP.
Motor Stalls While Idling
Set throttle lever adjusting screw so motor runs approximately 300 rpm, then set idle adjustment screw to specifications. If these adjustments do not correct the trouble, remove idle orifice tube and plug assembly. Clean tube and passages with compressed air. At this point, if the carburetor has not been rebuilt in the last 12 months, then do so now.
Set throttle lever adjusting screw so motor runs approximately 300 rpm, then set idle adjustment screw to specifications. If these adjustments do not correct the trouble, remove idle orifice tube and plug assembly. Clean tube and passages with compressed air. At this point, if the carburetor has not been rebuilt in the last 12 months, then do so now.
Acceleration Not Satisfactory
Remove pump jet and clean with compressed air. Poor acceleration may be due to damaged or worn accelerator pump, sediment in pump cylinder, or clogged intake ball check at bottom of pump cylinder and discharge ball check in discharge passage.
Remove pump jet and clean with compressed air. Poor acceleration may be due to damaged or worn accelerator pump, sediment in pump cylinder, or clogged intake ball check at bottom of pump cylinder and discharge ball check in discharge passage.
Correct Air Fuel Ratio
Provided by a balance tube cast in the air horn. The balance tube should be checked each time the carburetor is serviced to see tht the passage is open. The object of a balanced carburetor is to provide a constant air fuel ratio regardless of type, size or condition of air cleaner. If the air cleaner becomes clogged, the capacity will be reduced but the fuel ratio will not be changed.
Provided by a balance tube cast in the air horn. The balance tube should be checked each time the carburetor is serviced to see tht the passage is open. The object of a balanced carburetor is to provide a constant air fuel ratio regardless of type, size or condition of air cleaner. If the air cleaner becomes clogged, the capacity will be reduced but the fuel ratio will not be changed.
Excessive Richness
Above 50 miles per hour may be caused by a clogged main vent tube.
Above 50 miles per hour may be caused by a clogged main vent tube.
Pump Adjustment
Remove air horn assembly, back out the throttle adjustment screw, and place pump operating link in center hole of throttle shaft arm. Adjustment can be made by bending horizontal portion of pump connector link, so that top of pump plunger shaft travel is 3/8".
Remove air horn assembly, back out the throttle adjustment screw, and place pump operating link in center hole of throttle shaft arm. Adjustment can be made by bending horizontal portion of pump connector link, so that top of pump plunger shaft travel is 3/8".
Pump Stroke
Adjustable for high and low temperature. Set to longest stroke for cold weather, shortest stroke in hot weather.
Adjustable for high and low temperature. Set to longest stroke for cold weather, shortest stroke in hot weather.
1-238S
Body Flange Assembly (D6A1) (D6C1)
61-146
Step Up Piston Spring (Sup by 61-135)
1-262S
Body Flange Assembly (D6A2) (D6C2)
61-157
Plunger Spring
1A-45
Flange Gasket for use with governor
62-77S
Choker Tube Bracket Assy (D6A1) (D6A2)
1A-46
Flange Gasket for use without governor
63-24
Float Lever Pin Retainer
2-100
Throttle Valve
63-37
Pump Reatiner Ring
3-340S
Throttle Shaft and Arm Ass'y (D6A1) (D6C1)
63-46
Pump Spring Retainer
3-362S
Throttle Shaft and Arm Ass'y (D6A2) (D6C2)
64-60S
Plunger and Rod Assy
4-329S
Throttle Lever Assembly (D6A1) (D6C1) (Sup by 4-343S)
86-10
Lock Washer 11/64" ID (D6A1) (D6A2)
4-343S
Throttle Lever Assembly (D6A1-A2-C1-C2)
86-11
Lock Washer 19/32" ( Use with 101-54)
4A-49
Throttle Shaft Dog (D6A1)
86-15
Flange Stud Lock Washer
4A-53
Throttle Shaft Dog (D6C1)
86-17
Lock Washer 15/64" ID
4A-78
Throttle Shaft Dog (D6A2)
101-6
Choker Bracket Attaching Screw (D6A1)
4A-90
Throttle Shaft Dog (D6C2)
101-10
Wire Clamp Screw (D6A1) (D6A2)
6-294S
Air Horn Assembly (D6A1) (D6A2)
101-12
Throttle Lever Clamp Screw
6-310S
Air Horn Assembly (D6C1) (D6C2)
101-54
Flange Attaching Screw (Sup by 101-145S)
7-104S
Choker Valve Assembly
101-55
Air Horn Attaching Screw (Sup by 101-146S)
11B-17
Pump Check Plug
101-58
Throttle Adjusting Screw
11B-40
Rivet Plug (Sup by 11B-79)
101-142S
Choker Bracket Attaching Screw and Washer Assy
11B-41
Rivet Plug
101-145S
Flange Attaching Screw and Washer Assy
11B-79
Rivet Plug
101-146S
Air Horn Attaching Screw and Washer Assy
11B-103
Rivet Plug
105-11
Tube Clamp Screw (D6A1) (D6A2)
11B-108
Idle Hole Rivet Plug
105A-8
Choker Tube Clamp Nut (D6A1) (D6A2)
11B-138
Pump Jet Rivet Plug
105A-13
Flange Nut Stud
14-188S
Choker Control Lever Ass'y (D6A1) (D6A2)
115-30
Choker Connector Rod (D6C1) (D6C2)
14-227S
Choker Lever and Shaft Ass'y (D6C1) (D6C2)
115-31
Choker Connector Rod (D6A1) (D6A2)
20-26
Main Metering Jet Gasket
116-13
Pump Cylinder Bail
20-31
Needle Seat Gasket
116-18
Pump Check Ball
20-51
Step Up Jet Gasket
117-60
Pump Operationg Link
20-52
Step Up Piston Gasket
117-70
Pump Connector Link
21-49S
Float and Lever Assembly
121-68
Body Flange Gasket
24-23
Float Lever Pin
121-69
Body Gasket
25-82S
Needle and Seat Assembly
123-31S
Idle Orifice Tube and Plug Assembly
30A-37
Idle Adjustment Screw
136-55
Throttle Centering Spring Washer (D6A2-C2)
39-11
Valve Attaching Screw
145-17
Main Vent Tube
48-73
Pump Jet .0315"
149-43S
Step Up Jet and Gasket Assy
61-58
Throttle Lever Adjusting Screw Spring
150A-13
Pin Spring
61-84
Idle Adjustment Screw Spring
159-61S
Main Metering Jet and Gasket Assy (standard)
61-119
Choker Pull Back Spring (D6A1) (D6A2)
159-66S
Main Metering Jet and Gasket Assy (1 size lean)
61-135
Step Up Piston Spring
159-82S
Main Metering Jet and Gasket Assy (2 sizes lean)
61-144
Pump Spring (conical)
160-46S
Step Up Piston, Plate and Rod Assy
183-21
Insulator
