Marvel Carbureter and Heat Control - As Used on Series 691 Nash Sixes Booklet S
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Marvel Carbureter and Heat Control - As Used on Series 691 Nash Sixes Booklet S


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Project Gutenberg's Marvel Carbureter and Heat Control, by Anonymous This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at Title: Marvel Carbureter and Heat Control As Used on Series 691 Nash Sixes Booklet S Author: Anonymous Release Date: November 20, 2008 [EBook #27298] Language: English Character set encoding: ISO-8859-1 *** START OF THIS PROJECT GUTENBERG EBOOK MARVEL CARBURETER AND HEAT CONTROL *** Produced by Gerard Arthus, Greg Bergquist and the Online Distributed Proofreading Team at MARVEL CARBURETER AND HEAT CONTROL AS USED ON SERIES 691 NASH SIXES BOOKLET S MARVEL CARBURETER CO. FLINT, MICHIGAN U.S.A. M O D E L " S " C A R B U R E T E R Used on Series 691 Nash Sixes The carbureter measures the fuel charges for the engine and automatically mixes them with the proper amount of air to form a highly combustible gas. The Marvel Model "S" Carbureter is of the automatic air valve, heat controlled type. Its outstanding advantages are: 1. Simplicity of construction and operation. 2. Quick starting in any weather. 3. Automatically controlled heat application to ensure complete vaporization of fuels. 4. Economy in fuel consumption. 5. Ease of adjustment to meet varied driving and climatic conditions.



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Project Gutenberg's Marvel Carbureter and Heat Control, by AnonymousThis eBook is for the use of anyone anywhere at no cost and withalmost no restrictions whatsoever. You may copy it, give it away orre-use it under the terms of the Project Gutenberg License includedwith this eBook or online at www.gutenberg.orgTitle: Marvel Carbureter and Heat Control       As Used on Series 691 Nash Sixes Booklet SAuthor: AnonymousRelease Date: November 20, 2008 [EBook #27298]Language: EnglishCharacter set encoding: ISO-8859-1*** START OF THIS PROJECT GUTENBERG EBOOK MARVEL CARBURETER AND HEAT CONTROL ***DPirsotdruicbeudt ebdy  PGreoroafrrde aAdritnhgu sT,e aGmr eagt  Bhetrtgpq:u/i/swtw wa.npdg dtph.en eOtnlineMARVELCARBURETERAND HEAT CONTROLAS USED ONSERIES 691 NASH SIXESBOOKLET
SMARVEL CARBURETER CO.FLINT, MICHIGANU.S.A.MODEL "S" CUsed on Series 691 Nash SixesThe carbureter measures the fuel charges for the engine and automaticallymixes them with the proper amount of air to form a highly combustible gas. TheMarvel Model "S" Carbureter is of the automatic air valve, heat controlled type.Its outstanding advantages are:1. Simplicity of construction and operation.2. Quick starting in any weather.3. Automatically controlled heat application to ensure complete vaporizationof fuels.4. Economy in fuel consumption.5. Ease of adjustment to meet varied driving and climatic conditions.CONSTRUCTIONThe construction embodies a main body or mixing chamber and aconventional float chamber bowl with fuel strainer attached at point of entranceof fuel to bowl. Within the mixing chamber are two nozzles which proportion theamount of gasoline used in the mixture. One of these nozzles, called the "lowspeed," is regulated by the gasoline adjustment screw at bottom of carbureterand the other, called the "high speed," is controlled by the automatic air valve.An air screw is provided which regulates the pressure of the air valve springenclosed therein. Within this screw is also enclosed a plunger connected by alink to the air valve. The function of this plunger is to provide a resistance inaddition to that of the air valve spring to assist in acceleration. Thisarrangement of plunger and air valve screw is termed the dash pot.A further control of the high speed jet is provided by the fuel metering valveoperated by the carbureter throttle. This valve provides the maximum fuel feedto the "high speed" nozzle when the throttle is fully opened for high speeds andfor quick "pick up." During the ordinary driving ranges this valve controls theARBURETER
amount of fuel being used, thus providing all the economy possible. This valveis entirely automatic and requires no adjustment.The passage-way from the mixing chamber to the intake manifold iscontrolled by a butterfly valve which is called the throttle-valve and isconnected to the throttle-lever on the steering wheel as well as to the footaccelerator, its position determining the amount of gas and air or mixture beingfed the engine.STARTINGA choke button is provided on the instrument board to assist in starting.Pulling out this button closes a butterfly choker valve (see cut) in the air intakepassage of carbureter which restricts the air opening of the carbureter, andconsequently produces a richer mixture.To start engine, pull out choke button all the way. Advance spark lever abouthalf way and throttle lever about one-quarter way and depress starter pedal.As soon as motor fires when starting, this control should be released partway, otherwise too much fuel will be drawn from carbureter, causing flooding ofthe motor and failure of the latter to continue to promptly fire. After starting,motor should be allowed to run "part choke" as stated for a few minutes whilewarming up, then the choker control should be fully released, or pushed incompletely on the instrument board, and engine allowed to run normally forsometime until water in cylinder jackets is thoroughly warmed up before startingto make final carbureter adjustments.HEAT CONTROL—STOVEIn the colder seasons warm air is fed to air intake of carbureter through thewarm air elbow "F" (see cut). This elbow connects the carbureter with the warmair stove, which is a casting surrounding the two exhaust heat tubes whichsupply exhaust heat to the carbureter jackets as described below.The amount of heat required for proper carburation depends on thetemperature of the outside air. The first means of control is in the warm air stovejust described, which should be connected to the carbureter furnishing warm airto carbureter air intake in all seasons of the year when the outside airtemperature is below 50° F., whenever the outside air temperature runs abovethis point cold air should be furnished to carbureter air intake. This can be doneby loosening the wing nut holding the warm air elbow "F" on the stove and alsoloosening the set screw holding this elbow in the air intake of carbureter, afterwhich slide elbow out of air intake and revolve it—180 degrees about anhorizontal axis and re-insert in carbureter air intake and lock in place with setscrew. The opening in the elbow now is turned down away from the stove anddraws in only cold air.The above procedure, it must be understood, will vary somewhat due todifferences in locality, altitude and fuels used, but it should be borne in mindthat the best economy can be had with cold air passing to the carbureter, andthe stove should not be connected until the acceleration and performance of thejob requires the use of warm air for the best results.
The adjustment of the carbureter should be made per the above descriptionof the stove, as the latter is used for meeting weather conditions and should beset as described.HEAT CONTROL—CARBURETER JACKETSThe carbureter and manifolds have been designed to utilize the exhaustgases of the engine to insure complete vaporization and a consequentminimum consumption of fuel. This is accomplished by surrounding the upperportion of the mixing chamber with a large heat jacket provided with an inletand an outlet opening and connected by means of tubes to an exhaust manifoldvalve body in the exhaust pipe of the engine; this valve body, housing a largevalve called the main-exhaust-heat-valve ("C" in cut) within the body itself, thereturn or outlet tube from the carbureter heat jacket entering the valve-body inthe lower portion below the main-exhaust-heat-valve.The main-exhaust-heat-valve "C" is connected by means of a lever and longconnecting rod to the throttle lever of the carbureter so that when the throttlevalve is operated the main-exhaust-valve is operated simultaneously with it.The purpose of the carbureter heat jacket and valve in exhaust line withconnections described, is to provide means for utilizing the heat of the exhaustgases of the motor for vaporization of the fuel supplied the engine by thecarbureter and to do so automatically. The automatic feature of same isaccomplished by setting the Main-Exhaust-Heat-Valve "C" by means of thelong connecting rod, in closed position with the closed or idling position of thethrottle valve, thus providing for and causing all of the exhaust gases of theengine to pass through the heat jacket of the carbureter when engine is idlingand to regulate the volume of this heat as throttle is opened by automaticallyopening the Main-Exhaust-Heat-Valve, thus allowing the increasing volume ofthe exhaust gases to pass on out through the main exhaust pipe without beingdeflected and by-passed to the carbureter heat-jacket as the motor speedincreases.HEAT SETTING No. 1
By referring to the cut shown (See Page 5) and noting "Heat Setting No. 1," itwill be noted that valve "C" in main exhaust line is fully closed with the closedor idling position of the throttle valve. This adjustment is accomplished byhaving long connecting rod "R" from valve "C" Lever set in "Hole No. 1," inThrottle Lever "L," being sure that when throttle valve is standing in fully closedor idling position that valve "C" is also in closed position, proving out the latterfeature by loosening connection of valve "C" lever holding long connecting rod;holding Throttle Lever "L" in closed or idling position and bringing up valve "C"lever on connecting rod "R" as far as it will go to the right toward the carbureterand tightening its connection on the connecting rod in that position. After havingmade the adjustment as just described, it is assured that "Heat Setting No. 1"has been properly made and that all of the heat possible from the exhaust hasbeen secured.This "Heat Setting No. 1," provides as stated, for the most exhaust heatobtainable and should be used during the entire year, except in extremely hotseasons or hot climates or when high-test gasoline is being used in engine andeven then unless engine is losing power due to excessive heat.If loss of power or mileage due to too much heat is experienced, first besure that it is not due to driving on hot-air instead of cold-air. After makingthis observation, if there is still too much heat, refer to cut (See Page 7)describing "Heat Setting No. 2." It will be noted that connecting rod "R" fromvalve "C" is removed from "Hole No. 1," in Throttle Lever "L" and placed in"Hole No. 2," in Throttle Lever. This change is all that is necessary in order toreduce the amount of heat applied to carbureter. In "Heat Setting No. 2," whenthe throttle is in closed or idling position, valve "C" is quite aways off its seat.This adjustment provides for a great deal less heat than is provided by "HeatSetting No. 1" and is all that is required in the reduction of the volume of heattogether with driving on "Cold" air for the main-air-supply, in the warmestweather or hottest climates.HEAT SETTING No. 2NOTE—After original position of valve "C" is made as described in
"Heat Setting No. 1" do not again readjust valve "C" on connecting rodbut when changing from "Heat Setting No. 1" to "Heat Setting No. 2," merelychange position of long connecting rod from "Hole No. 1" to "Hole No. 2" inthrottle lever.ADJUSTMENTNo change should be made in the carbureter adjustments until after aninspection has been made to determine if the trouble is in some other unit. Itshould be noted that the gasoline lines are clear, that there is gasoline in thevacuum tank, that there are no leaks at connections between carbureter andengine, that the ignition system is in proper condition, and that there is evencompression in all cylinders.If it is necessary to test adjustment or to make a readjustment proceed asfollows:Set air screw so that the end is flush with the end of ratchet set spring.Loosen packing nut on needle adjustment. Turn gasoline adjustment to theright very carefully so as not to injure the needle point, until the valve is closedgently against its seat. Then turn to left approximately one complete turn whichwill bring notch in the disc handle directly below the guide post above it.Tighten packing nut to hold needle firmly as set.The notch in disc handle of needle is put in handle after the needle has beencarefully calibrated by a flow-meter at the factory, therefore the notch in handleshould register with guide post above it. This setting of needle valve isabsolutely essential to get the best results. The object in directing that needlebe first turned to the right until closed is to insure against two or more turnsopen, as from closed position to notch (usually about one turn) is the normalsetting. This being true it is not necessary to turn needle in to the right firmly butmerely far enough to be sure that when turning back to the left, to the notchregistering with guide post, that the needle is not more than once around or oneturn from its seat.Set stove heat and damper heat as previously instructed above. Pull outchoker to closed position and start engine in usual manner. As soon as enginehas fired release choker three-fourths of way in. Run until engine has warmedup then push choker all the way in, remembering to never use choker longerthan necessary, as when not needed it has a tendency to foul up engine andruin the lubricating oil in the crank case.Next, set air screw for good idle by either turning to the right a little orbacking out to the left as the needs of the engine require, remembering that firstof all, the needle must be set as described. With the needle so set and theengine warmed up, the adjustment of the air screw for proper idling is easilyaccomplished by using a little care. If the air screw is turned in too tight, themotor will roll. If the air screw is not tight enough, the motor will hesitate andperhaps stop entirely. To make a nice clean adjustment for idle, first having setneedle as described, turn air screw in quarter of a turn at a time until engine,does roll; then turn back to the left until engine hesitates, indicating that mixturehas too much air and is too lean; next turn air screw in to the right three or fournotches at a time until engine runs smoothly. This accomplished (and it is veryeasy to do by proceeding as directed above) the proper adjustment for the
easy to do by proceeding as directed above) the proper adjustment for theentire range of the engine will have been attained, thus insuring the besteconomy and power.MODEL "S" MARVEL CARBURETERSTANDARD EQUIPMENT 1923–24 Series 691 Nash SixesIf the engine idles too fast with throttle closed, the latter may be adjusted bymeans of the throttle lever adjusting screw.RICH MIXTUREAn over-rich mixture will cause the engine speed to fluctuate through moreor less regular periods from high to low speeds; the engine will seem to be mis-firing and there will be noticeable a strong odor, as well as, usually, a heavyblack smoke from the exhaust.LEAN MIXTUREThe best adjustment is obtained with the fuel and air valves set asdescribed. It must be remembered that too lean a mixture as well as an overrich mixture causes over-heating and loss of power and is not as economical asan adjustment which provides just the proper proportion of gasoline and air.CAUTIONIt must be remembered that the low speed needle has been carefullycalibrated to notch in disc handle and guide post above it, at the factoryand that in making an adjustment that the needle must be so set and therest of the adjusting done with the air screw as described, never varyingfrom described needle setting unless in extreme cold weather, when a little
more gas may be carried, or turning off a little when casing head gas is used inhot weather.Part No.08-0110-58011-53777-2187-212-415-516-5141-5151-5132-5182-5192-51MARVEL CARBURETERMODEL "S"Nash Series 691 Sixes Parts Price ListemaNCarbureter BodyCarbureter AssemblyInsert AssemblyAccelerator LeverThrottle LeverThrottle Fly10×24×12 Insert Lock ScrewBowl Support ScrewRatchet Spring ScrewBowl Cover ScrewThrottle and Choker Fly ScrewsThrottle Stop Adjusting Screw6-32×14" French Head ScrewecirP$ 6.0000.2200.704.
15-32Pilot Set Screw15-43Square Head Set Screw16-5Bowl Cover Gasket16-14Strainer Gasket (fibre)16-16Strainer Gasket (Copper)16-35Flange Gasket16-48Insert Gasket21-519Throttle Stop Damper Control and Shaft Assembly22-1Heater Jacket Plug23-8Air Screw Shell24-6Choker Spring24-116Air Valve Spring24-28Flusher Spring24-50Metering Pin Spring24-51Ratchet Spring25-524Choker Shaft and Spring Assembly27-10Choker Fly30-504Float and Lever Assembly33-501Float Shaft Assembly35-501Float Valve Assembly36-4Strainer Connection to Bowl38-501Insert Connection Screw43-508Gasoline Adjusting Needle Assembly44-1Gasoline Adjusting Needle Packing45-1Gasoline Adjusting Needle Packing Nut49-56High Speed Jet56-508Bowl Cover Assembly58-501Flusher Assembly64-1Bowl Support65-1Brass Bowl65-502Brass Bowl Assembly66-3Metering Pin Lock Wire67-1Strainer Body67-502Strainer Assembly78-1Throttle Shaft Washer78-5316 Lock Washer79-8Metering Pin Housing Space80-3Metering Pin Plug81-16Strainer Nut82-1Cotter Pin50.
83-2Manifold Stud.0584-3Metering Pin Jet.3595-1Strainer Gauze.20119-504Dash Pot Plunger, Plunger Rod and Washer Assem..80125-2Metering Pin Spring Seat.05158-2Metering Pin Housing.15167-502Metering Pin Stem and Wire Assembly.10173-529Metering Pin and Lock Wire Assembly.45REPLACEMENT FOR PREVIOUS MODEL NASH SIXESThe Model "S" Marvel Carbureter is interchangeable with the Model "K"Marvel Carbureter, which was standard equipment on the 1922 and 1923 NashSixes of the early 691 series.The previous series 681 Nash Sixes of 1921, 1920, and 1919, which wereequipped with the Model "E" Marvel Carbureter as standard equipment, can bevery greatly improved by the installation of the Model "S" carbureter, exhaustdamper body assembly necessary for same, and the hot air stove assembly thatgoes with this installation.Following is the complete Parts Price List of the Model "S" carbureter,damper body assembly and stove parts for same. Notice is called to the factagain that the damper body and stove parts are not needed on the early 691series of 1922 and 1923.FRoEr P1L9A19CE1M92E2N ST ePriAesR T68S1  PNRaIsChE  SLiIxSeTs10-579Carbureter and Heat Equipment CompleteConsisting of the Following Parts:Part No.Name10-580Carbureter Assembly128-506Damper Body and Stove Assembly15-1610×24×38 F.H. Machine Screw15-4314×20×12 Std. Square Head Set Screw15-53516×18×2-12 Cap Screw15-5438×16×1 Standard Square Head Set Screw17-14Exhaust Shut-off Valve Connecting Rod17-15Damper Connecting Rod (Main Damper)19-2Exhaust Manifold Damper Fly19-9Warm Air Stove Damper Fly20-31Stove Damper Fly Shaft $30.00 Price122.0000.8  101.1
24-31Damper Fly Shaft Spring124-43Stove Damper Fly Spring128-4Connecting Rod Swivel162-5Escutcheon Pin174-3Exhaust Shut-off Valve178-4516 Plain Washer181-2638×16 Check Nut282-1116×12 Cotter Pin282-318×34 Cotter Pin3100-16Warm Air Stove1100-17Warm Air Stove1100-520Warm Air Stove Assembly1122-503Damper Lever and Shaft Assembly1122-504Exhaust Shut-off Lever and Shaft Assembly1123-1Heat Tube Support Ring1123-3Damper Body Packing Stop Ring1123-4Exhaust Damper Body Packing Ring1124-1Heat Tube Collar4125-1Damper Shaft Spring Seat2126-2Heat Tube Outlet1126-12Heat Tube Inlet1127-1Heat Tube Packing4127-2Exhaust Damper Body Packing, per foot1128-3Exhaust Damper Body1128-506Exhaust Manifold Damper Body and Stove Assembly1163-1Choker Rod Extension CARBURETER DISTRIBUTORSDistributors who carry a complete stock of Carbureters and Parts andwho are prepared to overhaul and rebuild Carbureters:Marvel Carbureter Sales Co.,335 Newbury Street, Boston, Mass.Marvel Carbureter Sales Co.,242 West 69th Street, New York, N.Y.Marvel Carbureter Sales Co.,2120 Fourteenth Street, N.W., Washington, D.C.Marvel Carbureter Sales Co.,6520 Carnegie Avenue, Cleveland, Ohio.