DeSoto Carburetors for old Desoto's Carter : DESOTO MODEL S8 1941 Previous | Home | Next

Correct air fuel ratio is provided by a "balance tube" cast in the air horn. The balance tube should be checked each time the carbureter is serviced to see that the passage is open. The object of a balanced carbureter is to provide a constant air fuel ratio regardless of type, size or condition of air cleaner. Should the cleaner become clogged, the capacity will be reduced but the air-fuel mixture ratio will not be changed. ,
Excessive richness above 50 miles per hour may be caused by a clogged main vent tube. After removal of rivet plug beneath float bowl with tool No. T109-42, main vent tube can be removed and a new tube inserted with tool No. T109-70. Care must be exercised in inserting new tube which must seat tightly. Use new rivet to complete the installation.
Pump Adjustment: Remove air horn assembly, back out 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 contacts lip of indicator on pump stroke gauge T109-117S. Correct travel is 26/64" (10.32 mm).
Pump stroke adjustable for high or low temperature. Set to longest stroke for cold weather, shorter stroke for hot weather driving.
DASH-POT (EB1): Motors operating in connection with fluid couplings tend to stall during rapid deceleration unlessthe throttle is made to close slowly. Slow throttle movement is necessary only the last part of the closing. - The dash-pot or decelerating pump acts as-a snubber to the throttle, allowing fast movement to almost closed position, then slow closing from that point to the idle position.
Dash-pot operation is as follows: As the throttle is opened linkage raises the plunger, filling the dash-pot cylinder with gasoline from the bowl. 'There is little or no resistance to the gasoline as the cylinder fills. However, when the throttle is released, the throttle valve closes rapidly until throttle arm contacts dash-pot plunger arm. Then the plunger must be pushed to the bottom of the cylinder before the throttle can close. A ball check located in the lower end of the plunger shaft, seals the large upper openings and the gasoline must leave the cylinder through the small metered hole in lower end of the shaft. This reduces the rate at which plunger can be forced to the bottom of the cylinder making the last part of throttle closing very slow. The adjusting screw (in top of bowl cover) should be opened five full turns from closed position for average conditions. Under extreme driving conditions greater openings may be necessary, al-though extreme dash-pot action will affect gear change and not enough action will cause engine to stall.
Be sure plunger leather is soft and pliable and effects a good seal against the cylinder wall.
De Soto "S8"-1941-Nos. E6N3-E6S3, $29.40; EBI, $30.85
GASKET ASSORTMENT (E6N3-S3) No. 637, $0.60
REPAIR PACKAGE No. 1308 FOR SERVICING E6N3, $5.05—No. 1077A, E6S3, $5.05
All Prices Subject to Prevailing Surcharge
PART NAMES IN BOLD ARE THE PARTS
Part No. PART NAME List Price
Body flange assembly (E6N3-S3) $3.70
Body flange assembly (EB1) 3.70
Flange gasket—with governor --(All) .10
Flange gasket—without governor (All) .10
Throttle valve 30
Throttle shaft and arm assy (E6N3-S3) .90
Throttle shaft and arm assy (EBS) .90
Throttle lever assembly (E6N3-S3) .60
Throttle lever assembly (EB1) .65
Throttle shaft dog (E6N3) .30
Throttle shaft dog ....................... (E6S3-EB1) .30
Air horn assembly (E6N3-S3) 3.70
Air horn assembly ... (EB1) 3.70
Choker valve assembly (All) .75
Screw passage plug (All) .15
Rivet passage plug (All) .04
Rivet passage plug (All) (2) .04
Vent tube rivet plug (All) .04
Idle port rivet plug (All) .04
Pump jet rivet plug plug ............................... (All) .07
Choker shaft and lever assembly....(E6N3) .65
Choker lever (loose) (E6S3 EB1) .07
Choker lever and shaft assy....-(E6S3 EB1) .65
*Gasket (All) .07
Needle seat gasket (All) .07
*Step-up jet gasket ° ...... (All) .07
Step-up piston gasket (All) .07
Float and lever assembly-_ (All) 1.20
Float lever pin (All)
Needle and seat assembly (All)
idle adjustment screw (All)
Valve attaching screw (All) (4) 2
Pump jet (All)
Throttle lever adjust'g screw spring -..(All)
Idle adjustment screw spring (All)
Step-up piston spring _ -(EB1)
Step-up piston spring (E6N3-S3)
Pump spring (All)
Spring (under dash-pot plunger) (•EB1)
Plunger spring (All)
61-244 Dash-pot adjustment screw spring -.-(EB1)
63-24 Float lever pin retainer (All)
*Gaskets so marked must be soaked in 90 proof denatured alcohol for 15 minutes, installed on part, and let dry before using.
NOTE: Small figures preceding list price indicate number of pieces used in one carbureter.
Pump retainer ring (All) .07
Spring retainer °---- (All) .07
Plunger and rod assembly (All) 1.05
Dash-pot plunger and rod assembly-.(EBI) 1.35
Flange stud lock washer (All)
Clamp screw (All)
Throttle adjusting screw (All)
Dash-pot adjustment screw (EB1)
Attaching screw and washer assy (All)
Attaching screw and washer asst'.-._--(All)
Flange nut ... (All)
Choker connector rod (E6N3-S3)
Choker connector rod (EB1)
Pump cylinder ball ..... (All)
Pump check ball (All)
Pump operating link link .............................. (All)
Pump connector link (All)
Dash-pot lifter link __ z (EB1)
Body flange gasket (All)
Body gasket -. (E6N3-S3)
Body gasket (EB1)
Idle orifice tube & plug assy...--(E6S3-EB1)
Idle orifice tube and plug assy (E6N3)
Spring washer (All)
Main vent tube (All)
Nipple (EB1)
Step-up jet and gasket assembly....(E6N3)
Step-up jet and gasket assy (E653-EB1)
Dash-pot pin -(EB1)
Pin spring (All)
Main metering jet and gasket
assembly—1 size lean (E6N3)
Main metering jet and gasket
assembly—2 sizes lean_ (E6N3)
Main metering jet assembly—2 sizes
lean (EB1-E6S3) Standard (E6N3) ....... Main metering jet and gasket
assembly—3 sizes lean (E6N3)
Main metering jet assembly
1 size lean (E6S3-EB1)
Main meter'g jet assy.—std (E6S3-EBI)
Step-up piston, plate and rod assy (All)
Insulator ---- (All)