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Show 'I PROPER ADJUSTMENT OF CARBURETOR IS ESSENTIAL TO THE f j ECONOMICAL AND EFFICIENT OPERATION OF THE AUTOMOBILE J (Directions for Regulating Most Com- 1 j mon Makes of the Device Sup- piled by Motor Print i i !By Special Permintlon from Motor j Print. ( A good carburetor ndjustment is essential es-sential if one is to obtain the full pleas-iro pleas-iro out of motoring. Yet not one car !ln ten has a really good adjustment !and a car with perfect carburetor ac-jtlon ac-jtlon Is rarely found. A carburetor in Jpoor adjustment glvos a sluggish ac-'tion ac-'tion to the car, which is not only 'disagroeablo in Itself but curtails tho (speed and hill climbing ability of the (machine. It usually results in Increased fuel bills a borlous objection with the ipresent high prices of fuel. Further-fmore, Further-fmore, a poorly adjusted carburetor sometimes produces carbonization of ,tho motor nnd overheating. In view of jail these facts the importance of a jgood carburetor adjustment cannot be lover emphasized. i When it Is known that tho car-iburetor car-iburetor needs attention it is preferable, iof course, to tako the car to a repair fman. But many owners, for various (roasons, desire to do this -work themselves. them-selves. If tho former course is pursued (it Is essentlai to mako sure that tho best repair man Is secured- Not every man who operates a repair shop is an expert carburetor adjuster. The man Kvith the most experience Is the most Ideslrablo and will prove tho cheapest 'and most satisfactory in tho end (Whenever possible tho car should be i taken to a carburetor service station or to tho eervico station maintained by x tho dealer from -whom the car was purchased. I The amount of time that It takes to obtain a good setting Is variable and jinny run up into several hours oven when an experienced man Is doing the work. Here Is another reason for car-'burctor car-'burctor shortcomings, and if an owner 'calls upon a repair man to do the work instead of trying it himself ho should (first make certain that tho man Is (Competent and reliable and then ho ishould make him understand that ho Iwants tho best adjustment rcgardloss Iof the amount of tlmo it takes. ' The average owner does not know I how long it may take to put a carburetor carbu-retor in perfect order and as a result the proceeding is about as follows Ho tells tho repair man ho wants his carburetor adjusted; the latter Is a good mechanic and obtains a fair setting in a comparatively short time, but try as he will he cannot make it perfect The result Is that he gives It up as a bad Job as soon as ho has spent as much time on It as ho feels the owner can 'reasonably be expected to pay for. He cannot explain to his customer that it -might tako several hours to obtain the best adjustment. If he did ho would hA ktfkd unon ns a TWor ronalr man. . So he tells him that It is tho best that can be done, and tho customer usually j takes his word for it ( It Is not until he has a brush with another an-other car of the same make and model, 'If he ever does, that he realizes that something is wrong, and then may 'blame it on valves or ignition or atmos-'pherlc atmos-'pherlc conditions or some other Inno-Icent Inno-Icent circumstance. Following aro directions for ndjustlng somo of the most common makes : ManreL Close gasolene needle valve A all the 'way and then open one f nil turn. Then adjust B so that the end of tho screw lis about even wi,th the end of the ratch iset spring. After the motor has (started, close throttle and adjust the I needle valve until the motor runs smoothly. Then turn the adjusting screw B to the left one-eighth of a turn at n time until the motor begins to slow 1 down. Then tighten It until the motor runs smoothly. Advance the spark one-third and open throttle quickly If it hesitates or pops back, moie gas should be given by turning A to the left 1 and it may also be necessary to tighten the air screw a little more, but this should not be done unless absolutely necessary. The highest economy will be obtained with the air screw B released re-leased and tho gas .yalve A closed. Rayfleld Modclo G and I. There aro two adjustments on these models, the high speed A and the low speed B. Both turn to the right for a richer mixture. The carburetor should . I Marvel Slromberg No. 3 Rayfield G 3 B 1 I Stczvart D Kingston Johnson No. 3 1 Scltcbler A lWEggBggMBWWHMaBB "yw mmm. i,"-1"!! ffl Stron.bcrg G No. 4 J Tillotson No. 34 Slromberg No. K O j I ' si"" V ''$' iST "-' ; - 'tifr "-; wi "': y" h '- x t -vJfTv i'' ' ' -'' 48 I Schcblcf No. R J Rayfield No. M Zenith Master FROM KOToo. PRIKT. be adjusted with control down and the low speed should be adjusted beforo the high speed is touched. With the throttle throt-tle closed, turn the low speed adjustment adjust-ment to tho left until the block C slightly leaves contact with the cam M Then turn to the right about three complete com-plete turns and open the throttle about one-eighth. Start the motor and allow It to run until warm. Close throttle and adjust the low speed screw notch by notch until tho motor idles properly. If the motor does not run slow enough, adjust ad-just the stock screw until it runs as slow as desired. To mako the high speed adjustment advance the spark about 1 4 and open the throttle quickly; If the motor should backfire, make the mixture richer, one notch at a time. On the other hand, If loading or choking Is experienced, turn tho high speed adjustment ad-justment to tho left Stcvart. There is only one adjustment on this carburetor and that Is the relative height of the metering pin to the opening open-ing of the aspirating Uibe. The metering meter-ing pin is controlled from the dash by a rack and pinion nnd the fixed running position may be changed by turning the stock screw to the right or left. Turning Turn-ing the bcrew to the right lowers the position and to tho left raises It With the former more gasolene is admitted. Kin k ton. There is a single adjustment on this carburetor, the needle valve A, which Is set to give perfect running at low speedi- Johnnon. j Turn the needle valve A to the right until it stops and then to the left one and one-half turns Also turn slow speed screw B until it is shut With spark lever advanced one-fourth open tho throttle quickly, and, if the motor does not miss or backfire, turn the needle to the right gradually until It docs, then bring It back one-sixteenth to one-eighth turn, or until the backfiring back-firing ceases. Scbebler Model A. First turn the air valve A so that it seat3 firmly but lightly, then close the needle adjustment B all the way and then open It from four to five complete com-plete turns. Open the throttle one third and start tho motor Clobc throttle slightly, retard spark and ad Just throttle lever screw F and needle valve, adjusting screw B until tin motor runs at the desired minimum speed. Place tho pointer on dial D about half way between Figs. 1 and 3, advance spark and open throttle ho that the roller on the track running below the dial is In line with the first dial. If the motor backfires turn the indicator further toward No. 3, or, if the mixture is too rich, move It back toward No. 1. Then open the throttle wide and adjust dial E for high speeds In the snme manner. Siromberc Q. There are two adjustments on this carburetor, the high speed A and the low speed B. With spark retarded turn nut B up or down until the motor runs smoothly with the throttle closed or nearly so. If opening the air valve with the finger causes the motor to speed up, it indicates too rich a mlx-ture mlx-ture and If the motor dies suddenly too lean a mlxtuie. For high speed advance the spaik to normal posltiou and open the throttle gradually If motor backflies, the mixture Is too lean and nut A should bo turned up notch by notch until this Is overcome. If the motor loads, or gives forth black smoke, the nut should be turned dow n The gasolene adjustment Is set at the factory and should never need any attention. Strombcrpr IT. The float level adjustment nnd the air valve spring ndjustment are locked at the factory and should never need attention Consequently the only two adjustments are the low speed A, which Is a needle vnlve, and the high speed adjustment B. " Strombcrj? IC and KO. There Is only one adjustment on this model and that is the nut A, which acts on the air valve. Before starting tho motor, turn this nut anti-clockwise notch by notch until the click disappears, then two more turns In the same direction. After tho motor is warm turn the nut up or down until It idles properly. The gasolene flow Is controlled by n noz.le Nozzles of various sizes are produced, but usually the ones In the carburetor will be found satisfactory. Schcbler Model R. First turn air valve cap A to the right or clockwise until It stops; then turn to the left one completo turn. After motor Is warm turn A to the left until motor runs perfectly Advance spark three-quarters, and If engine backfires on quick acceleration turn adjusting screw up until acceleration Is satisfactory. satisfac-tory. Tillotion. This carburetor is used on some of the Overland models and has a single adjustment a needle valve A, whkh Is turned to the right or left until the motor operates propeilj', with the car running at speed of 15 m. p. h The valve bhould usually be off its seat one to one and one-half turns. na field Model M. The low speed adjustment A should be turned to the right or left as required re-quired until the motor runs properly at low speed. If It does not run slowly enough turn the stock screw The high and Intermediate adjustment Is made accessible by removing the hot air elbow over the elbow; do not move the screw more than one-eighth turn at a time to the right for richer mixture mix-ture and to the left for leaner Zenith. In the Zenith carburetors the composition com-position of the mixture Is fixed once for all by tho choosing of the three variables, the size of the choke tube, main jet and compensator. If the choke tube A Is too large the pick-up will be defective and cannot be bettered by the use of a larger compensator Low speed running will not be very smooth. Too small a choke tube will prevent the motor from taking a full charge with the throttle open fully. The pick-up will be good, but it will not be . , Many Hours May Be Necessary to f Obtain Results, but Owner Will Receive Satisfaction for Labors. f possible to attain full speed. Tho fa. ' fluenco of the main Jet B is mainly felt at high speed. On a level road It will give under ordinary conditions a regular mixture; Irregular running I backfiring in the muffler, sitting of the spark plugs and low mileage. "Wh I the Jet too small the mixtULo will be . lean at high .speeds, the motor may j' backfire, although this is not probable, and the car will not attain full speed The proper compensator C is best determined de-termined by trying tho car on a bill and of such a slope that the motor will labor to make It on high gear, if the mixture Is too rich the car will act ' characteristically, and If too lean will miss. Slow speed adjustment Is mado by turning screw D to the right or left ! MaMer. ' There are no adjustments on this car- buretor, the proportion of fuel and air ' being regulated by a rotary throttle which uncovers a series of minute holei through which the gasoline flows. The !" further the throttle Is opened the more f holes aro uncovered. I Mnjcx Model S. Before attempting to adjust the carburetor car-buretor tho difference between a weak and a rich mixture should be under- ) stood. If there Is too much air the ' motor will not respond Immediately when tho throttle Is opened quickly; there will be a lag from the time the ' accelerator pedal is depressed unUl the r car begins to gather speed The motor may also backfire, especially at high '' speeds. With too much gasoline, oa r the other hand, the car will respond Instantly In-stantly to the opening of the throttle, v but not with the same vim as with a perfect mixture A great excess of fuel will produce black smoke in tho exhaust. Before touching the carburetor It should be ascertained whether the trouble Is not elsewhere. Faulty ignition igni-tion and leaky cylinders are often mistaken mis-taken for bad carburetion. Breaker points out of adjustment, spark points, short circuits, porcelains cracked, loose connections, grounds, and even retarded spark may look like cai buretor disease until an investigation is made Likewise Like-wise valves that need grinding or cylinders cyl-inders that leak may throw suspicion on the carbuietor A thin mixture may be caused by air leaks In the manifold, cylinder head gaskets, valve plug or vnlve guides. Any of these will produce missing at ' low speed A leak In any part of the I manifold may be determined by noting I whether the smoke from a cigar or '' cigarette will be sucked in. These and ', other leaks may also be located by listening or feeling ". ThpTTilrhirp ivlll hr wniik If the lerri t Is too low in the float chamber, which ) may be the result of a bent float arm .or sticking in some part of the raechan- ism Or If there is an adjustable level ( there may be some fault In either the 1, mechanism or Its adjustment f Any obstruction to the free flow of " I the fuel will result In a lean mixture. j There may be dlit in the fuel pipe or In 1 the nozzles. Too rich a mixture may be caused by 1 a worn float vale or worn adjusting needle valve or nozzle. It is usually due to too high a float level, which In turn may be caused by a stuck or bent 1 float mechanism, or dirt under the c float vnlve. If the float Is made of cork, the shellac may gradually have dissolved and the fuel will have soaked Into it, making it hea- ler and consequently conse-quently raising the level. Similarly a pinhole in a metal float will allow gasolene to enter and weight it The , cork float may be repaired by drying In i an oven and shellacking it again, and the metal float by enlarging tbo hole, draining the gasolene out, and then , closing It with solder. Before adjustment of the carburetor Is attempted the motor should be al- (' lowed to run until It Is thoroughly warm. The easiest way to determine tho best setting Is to run the car up a test bill , after each change. Approach the hot- ' torn at the same speed each time and note the speed attained as the car passes over the top. t If there is no hill available an acceleration ac-celeration test will prove an excellent substitute. |
