Chevrolet with Old Carter Carburetors : CHEVROLET PASSENGER & TRUCK G. M. C. TRUCK 1939 1940 1941 1942

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CHEVROLET PASSENGER & TRUCK G. M. C. TRUCK 1939 1940 1941 1942

Increased resistance on foot throttle indicates a clogged pump jet. Pump jet should be removed and cleaned with compressed air, which, in many cases, will remove the dirt or lint. However, it is usually advisable to replace the pump jet, as its cost is nominal. All jets and ball checks must be seated gasoline-tight.
Poor acceleration may be due to damaged or worn plunger leather in accelerating pump, corrosion in pump cylinder, loose or cracked cylinder, cracked plunger cup or bent pump arm (parts which may be replaced at small cost). If plunger is removed from cylinder, always use loading tool in re-assembling to avoid damage to plunger leather.
Holes in pump arm provide pump adjustment. Set to longest stroke for extreme cold weather, shortest stroke for hot weather driving.
Chevrolet Six— 1939-40-41-42—Carbureter 420S—List Price $ 17.65 All Prices Subject to Prevailing Surcharge
When Servicing, Use Gasket Assortment No. 638A—Price $0.50; Repair Parfs Pkg. for 420S, No. 1013C—Price $6.90
PART NAMES IN BOLD TYPE, LISTED BELOW, INDICATE CONTENTS OF REPAIR PACKAGE
Part No. PART NAME List Price
1A-17 Flange gasket 11/4" S. A. E $0.07
2-101 Throttle valve 15
3-336S Throttle shaft and lever assembly 90
6-289S Air horn assembly 3 70
7-110 Choker valve -°"""°"'- 30
11-138 Low speed jet (Superseded by 11-144) 30
11-144 Low speed jet 30
11 B-12 Rivet plug --°---'--'---"°°"" 04
11 B-16 Pump jet passage plug (Sup. by 11B-198) 15
11B-25 Disk check passage plug 15
11B-27 Idle hole passage plug (Sup. by 11B-199) 15
11B-35 Rivet plug "'•-""' 04
11B-62 Rivet plug 04
11B-69 *Rivet plug "°° 04
11B-198 Pump jet passage plug 15
11B-199 Idle hole passage plug 15
12-236U XNozzle unit (Consists of 12-233, 12-234, 20-45) .90
12.304U XNozzle unit (Consists of 12-301S, 11B-164,
20-45) ....---'- 90
14-237S t: hoker assembly with clamp and screw 50
14-239S Choker shaft and lever assembly 60
20-22 *Needle seat gasket :
20-26 *Metering rod jet gasket 07
20-29 Pump cylinder bushing gasket (upper) 07
20-45 Nozzle gasket 07
20-71 Air horn gasket """"' 07
21-45S Float and lever assembly 1.20
24-15 Float lever pin 07
25-33S Needle and seat assembly 1.20
30-20 Strainer gauze (pump check) 15
30A-40 Idle adjustment screw 45
39.10 Choker valve attaching screw 2 fer 07
39-11 Throttle valve attaching screw _ lur 07
48-43 Pump Jet .025" 20
53A-89S Pump arm and spring assembly 75
61-23 Plunger spring (Superseded by 61-206)
15
61-75 Metering rod spring 15
61-96 Pump spring -" ' .°'-"°'°" 15
61-97 Adjusting screw lock spring 15
61-196 Choker lever spring 15
61-197 Choker valve spring (Superseded by 61-217) 15
61.200 Plunger spring 15
61-217 Choker valve spring 15
62-101S Tube clamp assembly 35
63-44 Spring retainer 07
64-25 Plunger leather 35
64-30S Plunger and rod assembly (Shaft 49-94) 1.30
75-342 Metering rod—1 size lean (was standard)
.069"-.069" to .059"-.059" to .055"-.043" 45Part No. PART NAME List Price
75-377 Metering rod—standard, .0675"-.0675" to
.057"-.057" to .050"-.040" 45
Metering rod—1 size rich, .066"-.066" to
.055"-.055" to .047"-.037" 45
Dust cover attaching screw lock washer (Use
with 101-22) -'-_--'_ 02
Flange stud lock washer 02
Air horn attaching screw lock washer (Use
with 101-50) 02
86-19 Plunger washer (inner) 05
86-20 Plunger washer (outer) 05
86-21 Plunger shaft lock washer 02
97-15 Plunger cup '°'°'°'--""-'-"'-"""° 20
100-16 Throttle lever adjusting screw (Superseded
by 101-121) """'-•"'•°'°" 07
101-10 Wire clamp screw 07
101-22 Dust cover attaching screw (Superseded
by 101-143S) 07
101-28 Throttle shaft arm clamp screw 07
101-50 Air horn attaching screw (Sup. by 101-144S) .07
101-121 Throttle lever adjusting screw 07
101-143S Dust cover attaching screw and washer assy. .07
101-144S Air horn attaching screw and washer assy 07
105-11 Tube clamp screw 07
105A-8 Tube clamp nut 07
105A-12 Plunger shaft hex nut 07
105A-13 Flange stud nut 07
114.15S Throttle shaft arm and screw assembly 30
115-19 Throttle connector rod : 20
117-12 Connector link 07
118-16S Dust cover and spring assembly 75
120-129S Metering rod Jet and gasket assembly, .095" .45
121-67 Bowl cover gasket 15
122.45S Intake disk check assembly 35
122-47S Discharge disk check assembly 35
129-21 Metering rod disk 04
136.19 $Plug washer (Conical) 136-50 (Flat) 02
136-20 *Plug washer (Conical) 136-49 (Flat) 02
136-27 *Plug washer (Conical) 136-48 (Flat) 02
144-11 Throttle lever screw spring (Use with 100-16) 05
146.75 Bowl cover "'•.-"--°'--- 1 45
150A-10 Pin spring "' """' --"- 02
156-13 Gas line nipple 30
201-10 Metering rod disk stop (Sup. by 201-11) 15
201-11 Metering rod disk stop 15
75-378 86-9
86-15 86-17
*Parts so marked must be soaked in 90 proof denatured alcohol for 15
tllB-62 used on 1939 units of Bay City manufacture, and all 1940 models. 11B-69 used in Carter-made 1939 models. *The use of flat or conical plug washers should be determined by shape of seat in casting.
X12-236U Nozzle Unit interchangeable with 12-304U Nozzle Unit.
minutes, installed on part and let dry before using.