Packard Service Counselor, Studebaker-Packard
Contents
1. Er PARTS i e Qee a VOL 29 NO 10 STUDEBAKER PACKARD CORPORATION e ACCESSORIES PACKARD DIVISION OF OCTOBER 1955 WCFB Carter Carburetor Model 2394 S A new 4 barrel Carter Carburetor known as the WCFB Carburetor Model 2394 S is used on 1956 Clipper Custom Models 5660 The 4 barrel carburetor provides the advantages of a compound installation of two 2 barrel carburet ors in one compact unit It is possible to use smaller venturi leaner metering rods and jets when a carbu retor only takes care of speeds up to approximately 34 throttle opening Greater throttle opening re uires additional air and fuel which is supplied by the additional 2 barrels therefore the overall per formance and efficiency are improved The 4 barrel carburetor is divided into a primary section and a secondary section The primary section is composed of the 2 barreled forward half of the assembly This section is essen tially a complete 2 barrel carburetor containing a float system low speed system high speed and power system and accelerating system This section also in cludes the climatic control automatic choke mech anism The secondary section includes the 2 barreled rear ward half of the carburetor assembly This section is essentially a supplementary 2 barrel carburetor which cuts in to assist the primary section when a greater throttle opening or a greater engine load is reache2. wy pne aa gt a ae i 2 until lip of clamp contacts the vacumeter link then tighten the clamp screw To check for proper meter ing rod adjustment hold the vacumeter link and rods at their bottomed position and open the throttle There should be no lost motion before the link and rods move upward when the throttle lever is moved from its closed position Install the dust cover using a new gasket Fig 11 5 Bowl Vapor Vent Adjustment With the throttle valves closed and the choke blocked open the vapor vent should open 062 Using a feeler gauge measure between the metering rod dust cover and the lower edge of the vapor vent cover Fig 11 Adjustment of the vapor vent valve can be made by bending the tang on the vapor arm Insert Fig 11 6 Fast Idle Adjustment A Loosen choke lever clamp screw on choke shaft A Fig 12 Insert 020 wire gauge Tool No T109 29 between lip of fast idle cam and boss of flange casting B Fig 12 Hold choke valve tightly closed and take slack out of linkage by pressing choke lever toward closed position hold in place and tighten clamp screw A B With choke valve tightly closed adjust fast idle adjusting screw A Fig 13 until a 023 wire gauge Tool No T109 189 can be inserted between the rear The Packard Library http www thepackardlibrary com 50 Fig 15 side of the primary throttle valves and the throttle body bore B
3. Crack the throttle valve then close the choke valve While holding the choke valve closed close the throttle Using gauge T109 189 024 check the clearance between the throttle valve and the bore A Figure 7 on the side opposite the idle mixture screws Be sure that fast idle link is on high step of cam If adjustment is necessary bend the choke connec tor rod at the lower angle B using bending tool T 109 213 7 UNLOADER ADJUSTMENT Hold the throttle wide open close the choke valve as far as possible without forcing There should be 14 clearance using gauge T109 36 between the top edge of the choke valve and the inner wall of the air horn A Figure 8 If adjustment is necessary bend the choke trip lever arm B Figure 8 to obtain the 14 clearance at the choke valve Using bending tool T 109 213 Fig 8 Install the choke thermostatic coil and housing the baffle plate should be installed ahead of the gasket The coil housing should be set two points rich before the retaining screws are tightened Rochester Carburetor Model 4GC The 4 barrel Rochester Carburetor Model 4GC is used on 1956 Packard Models 5680 All adjustments are made in the same manner and to the same measurements as described in Service Counselor Vol 29 No 2 February 1955 and in the Fuel and Exhaust Section of your new Service Manual NOTE The Atmospheric Idle Vent has been elimi nated Shown in
4. Fig 13 Be sure fast idle adjusting screw is on high step of cam while making this adjust ment 7 Unloader Adjustment First hold the choke valve wide open then push the throttle wide open Fig 14 release the choke so it will close While holding the throttle wide open there should be 3 16 clearance Tool No T109 28 between the upper edge of the choke valve and the inner wall of the air horn A Fig 15 Bend unloader lip B to get the proper choke valve clearance Use bending Tool T109 41 Fig 16 8 Secondary Throttle Lever Adjustment Primary and secondary throttle valves should reach wide open position at the same time To adjust bend operating rod at upper angle indicated by arrow Fig 16 Use bending Tool T109 213 9 Secondary Throttle Lock out Adjustment The secondary lock out is provided to prevent the possi bility of opening the secondary throttle valves with the choke closed or partially closed with a cold engine A Crack throttle valves and hold choke valve tightly closed Then close throttle Tang A Fig 17 on secondary throttle lever should freely engage in notch of lock out lever If necessary to adjust bend tang on secondary throttle lever 51 The Packard Library http Awww thepackardlibrary com Fig 18 B Hold choke valve in wide open position Open primary throttle valves all the way With carburetor in upright position the lock out lever should fall fr
5. aligning float remove as much clearance as possible between arms of float lever and lugs on air horn by bending the arms of the float lever at the float lever hinge pin Arms of float lever should be as parallel to the inner surfaces of lugs on air horn as possible Float must operate freely without excess clear ance on its hinge pin Fig 2 52 Fig 3 3 FLOAT SETTING With bowl cover assembly inverted the float level should be set to 3 16 using float level gauge T109 28 as shown in Figure 2 The gauge should be placed under the float at its lowest point If adjustment is necessary bend the small lip in the V shaped section of the float arm near its pivot point Do not bend the arm Before installing the bowl cover assembly make sure that the accelerator pump check needle is prop erly installed See Figure 3 Place the vacumeter piston spring in its well as shown in Figure 3 Fig 4 Attach the vacumeter piston see arrow Figure 4 to its link and install the gasket and cover assembly The Packard Library http www thepackardlibrary com as shown in Figure 4 and then install the eight re taining screws Install the metering rods reversing the removal pro cedure Be sure to place the hooked ends of the metering rod spring around the shank of the rods before inserting them 4 ACCELERATOR PUMP ADJUSTMENT Block the choke valve open with cardboard A Figure 5 Back out the idle
6. Fig 9 in the Service Counselor and Fig 29 in the Service Manual Therefore no adjust ment is required The vent contact arm has been bent away so it will not contact and open the valve The 1956 Model 4GC Carburetor has a pair of spring loaded velocity operated auxiliary throttle valves located in the secondary bores above the secondary throttle valves When air velocity is high metering control is good and the auxiliary valves are held open During low speed wide open throttle operation the air velocity through four bores often becomes too low to allow good metering control the lowered velocity allows the auxiliary valves to close the secondary bores thus effectively doubling the air flow through the primary bores In this way effective metering control is possible through a wider range of wide open throttle Operation REMOVAL OF AUXILIARY THROTTLE VALVE ASSEMBLY The assembly will usually be removable by grasping _ with the thumb and forefinger and lifting the assembly 54 from the carburetor body In the event that the assem bly sticks carefully tap it from the body from above with along punch Be careful to not distort the valves CAUTION Do not disassemble the auxiliary throttle valves or change the screw setting indicated by the arrow in the illustration The spring tension is set correctly at the factory any change in calibration will completely upset the operation of the secondary side of the carburet
7. d This section contains a float system a high speed system no metering rods It has a separate set of rottle valves and a set of auxiliary valves which are located in the barrels above the throttle valves The primary throttle valves are operated by the accelerator pedal and the connecting throttle linkage The secondary throttle valves are operated by the primary throttle valve shaft through delayed action linkage which permits an approximate 34 opening of the primary valves before the secondary valves start 47 A A to open The geometry of the linkage then causes both sets of throttle valves to reach the wide open position at the same time The auxiliary throttle valves permits the use of larger secondary venturi for improved performance and smoother secondary operation Its shaft is counterweighted and the valves are offset mounted Air velocity through the carburetor controls the position of the auxiliary throttle valves according to engine requirements and no service adjustments are required When the accelerator is fully depressed only the primary high speed circuit will function until there is sufficient air velocity to overcome the weight on the auxiliary throttle lever and open the auxiliary throttle valves When this occurs fuel will also be supplied through the secondary high speed circuit In other words without auxiliary throttle valves if the secondary throttle valves are opened at low car speeds t
8. ee allowing secondary throttle valves to be opened be fore primary throttle valves are fully open If nec essary bend tang A Fig 18 on secondary throttle lever to provide clearance for proper operation of lock out lever WGD Carter Carburetor Model 2393 S A new 2 barrel Carter Carburetor known as the WGD carburetor Model 2393 S is used on 1956 Clipper Deluxe and Clipper Super Models 5640 The following paragraphs describe the adjustments necessary to service the 2 barrel carburetor It gs important that the adjustments be performed in the exact sequence given 1 Remove the metering rods dust cover A Figure 1 Disconnect the metering rods from the vacumeter link by using a scratch awl or a pointed instrument and pushing outward on the eye of the rod and then extract the rod Unsnap the clips and remove the choke rod and accelerator pump rod B Figure 1 Remove the eight fuel bowl cover retaining screws and lift off the cover and float assembly Fig 1 CAUTION Under no circumstances should the discharge nozzles or the anti percolator well plugs the plugs at each side of the pump jet housing be re moved when servicing this carburetor 2 FLOAT ALIGNMENT Check float alignment before setting the float level Side of float should be parallel to the outer edge of the air horn casting so that the float will not touch the sides of the fuel bowl Adjust by bending float lever After
9. he air intake is greater than is required creat ing an undesired mixture With the auxiliary throttle valves gradually opening with the air velocity the proper mixture can be maintained from low to high car speeds The following paragraphs describe the adjustments necessary to service the 4 barrel carburetor It s important that the adjustments be performed in the exact sequence given 1 Remove the metering rods dust cover A Fig 1 Disconnect the metering rods from the vacumeter link by using a scratch awl or a pointed instrument and pushing outward on the eye of the rod and then extract the rod Unsnap the clips and remove the choke rod and the accelerator pump rod B Fig 1 LI A Hepara LOWMDIo OTT PRODUCT 48 Remove the air horn and floats assembly NOTE 7 long screws A 8 short screws B and 1 medium length screw C attach the air horn to the carburetor main body as indicated in Fig 2 CAUTION Under no circumstances should the discharge nozzles or the anti percolator well plugs be removed when servicing this carburetor indicated by Arrows in Fig 3 2 Float Settings Do not mix up the floats or float needles from one side to the other as float needles and seats are mated and flooding may occur if the needles are not installed in their original seats The float level adjustment is made with the bowl cover air horn gasket removed A Float Le
10. or If wear or damage has occurred replace the complete auxiliary valve assembly INSTALLATION OF AUXILIARY THROTTLE VALVE ASSEMBLY Invert carburetor body and press the auxiliary throttle valve assembly into place in the casting mak ing sure that it does not project below the carburetor body Be sure that the assembly is installed with the valve shaft below the valves as shown in the illustra tion Service Manual Electrical Section Correction Please make the following correction in the Electri cal Section of your new 55th Series Service Manual On page 39 under Trouble Shooting and Corrective Measures item 15 change the Correction to read Polarize the generator by momentarily connecting a jumper across from the armuture A terminal to the battery B terminal on the regulator Twin Ultramatic Transmission Fluid Correction Please refer to your Service Counselor Vol 29 No 8 August 1955 on the above subject In the last paragraph of the article change the AQ AFT to read AQ ATF PRINTED IN U S A The Packard Library htto www thepackardlibrary com
11. speed screw approximately two full turns so that the throttle valves seat tight in the bores of the flange body 53 The Packard Library htto www thepackardlibrary com With the throttle valves held tightly closed hold a straight edge across top of dust cover boss at pump arm The flat on top of pump arm B should be parallel to straight edge as shown in Figure 5 Adjust by bending pump rod at the upper angle C using bending tool T 109 213 5 METERING ROD ADJUSTMENT The metering rods must be adjusted after the pump adjustment has been made First loosen the screw A Figure 6 With the idle speed screw backed out and the throttle valves seated in the bores of the flange body press down on the vacumeter link with a scale or small screw driver until the metering rods bottom While holding the rods in this position revolve the clamp B forward away from the air horn until lip of clamp contacts the vacumeter link then tighten the clamp screw To check for proper metering rod adjustment hold the vacumeter link and rods at their bottomed position and open the throttle There should be no lost motion before the link and rods move upward when the throttle lever is moved from its closed position Install the dust cover using a new gasket Fig 7 6 FAST IDLE ADJUSTMENT This adjustment must be made before the unloader ad justment Remove the choke thermostatic coil and housing gasket and baffle plate
12. ump plunger spring in its well and the vacumeter piston spring in its well Attach the vacumeter piston to the vacumeter link B Fig 8 Carefully start the accelerator pump plunger in its bore C Fig 8 Install the bowl cover 49 assembly to the carburetor body and secure it with the screws A B C Fig 2 3 Accelerator Pump Adjustment A Block choke valve open with cardboard A Fig 9 Fig 8 B Back off idle speed screw B approximately two full turns so that the throttle valves seat tight in the bores of the flange body Be sure pump connector links is in outer hole long stroke of pump arm C Fis Fig 9 C Hold straight edge across top of dust cover boss at pump arm The flat on top of the pump arm D should be parallel to straight edge E Fig 9 Adjust by bending pump rod at lower angle F using bending tool T109 213 4 Metering Rod Adjustment The metering rods must be adjusted after the pump adjustment has been The Packard Library htto www thepackardlibrary com made First loosen the screw A Fig 10 With the idle speed screw backed out and the throttle valves seated in the bores of the flange body press down on the vacumeter link with a scale B until the metering rods bottom While holding the rods in this position revolve the clamp C forward away from the air horn 5 K PENS Fig 10
13. vel Two separate float adjustments must be made lateral and vertical Lateral Adjustment With bowl cover assembly inverted and float resting on seated needle place float gauge under floats with notched portion of gauge fitted over edge of casting Side of floats should just clear the vertical uprights of the float gauge B Fig 4 Adjustment is made by bending arms of floats The Packard Library htto www thepackardlibrary com Vertical Adjustment With float gauge in same position floats should just clear the horizontal section of gauge A Fig 4 Vertical distance between top of float and machined surface of bowl cover must be l inch gauge T109 232 for primary floats and 3 16 inch gauge T109 222 for secondary floats Adjust by bending float arms as shown in Fig 5 Fig 6 B Float Drop Adjustment With the bowl cover air horn supported in an upright position the distance from the machined surface on the bowl cover to the top of the secondary floats should be 17 32 Fig 6 The distance for the primary floats should be 15 32 Fig 6 Adjust by bending tang indicated by A Fig 5 Fig 7 Be sure to install the accelerator pump check needle shown in Fig 7 before installing the pump jet gasket jet housing and retainer screw Install a new bowl cover gasket A Fig 8 IMPORTANT Vacumeter link must be installed with lip toward air horn See D Fig 2 Place the accelerator p
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