The float height setting procedure is as follows. Firstly remove carefully the bowl gasket, now in inverted position hold the carburetor. In a direction parallel and opposite to the float hinge pin, place carefully the tool across the carburetor body. By bending the tab on the float adjust the float height until the tab touches. Now, very carefully try to thrust through the hole towards the center of the seat and then remove it. Make sure you always use a new seat for the replacement purpose and never reuse an old seat.
This job can also be performed efficiently using the TecumsehPower tool Float and the inlet needle needs to be reinstalled into the carburetor. It is also important that the long end on the inlet needle of the clip should be pointing toward the air intake choke side of the carburetor. By carefully placing the detent portion in a direction opposite of the hinge pin the float bowl can be installed.
The deepest end of the bowl needs to be placed in a position exactly opposite to the inlet needle. Located in the deepest part there is a dimple in the bowl.
The dimple serves the purpose of minimizing the chances of the float that may at times stick to the bottom of the bowl that is mainy caused by stale fuel. For float removal purpose, using a needle nose pliers carefully grasp the cross piece lying somewhere between the center leg as well as the pivotal point on the float. It is very important to pull out the float straight out in such a manner that it does not break. While installing the float, into the hinge slot present on the float place the float hinge pin and slowly press into place in the bowl.
In order to hold the seat in the place, there may be few types of bowls that may also contain a clip or retaining ring. This feature may come pre-installed as needed for the manufacturing process. In order to make the process of assembly easy, on the gasket and the bowl an alignment notch is also placed that would guarantee a proper location for the gasket. All the welch plugs must be removed in order to expose the drilled passages to facilitate proper cleaning.
Sharpen to wedge point a small chisel in order to remove the welch plug. Carefully drive chisel inside the welch plug and then push down on chisel to out of the position.
As illustrated, a new welch plug must be installed bell-up. Tap down on to the plug using a punch that is equal or greater than actual size of the plug. Make sure that the dent must not drive to the center of the plug below or to the top surface of the carburetor.
Since the nail polish offers resistance towards the fuel, nail polish can be used to seal the outside edge of the plug with nail polish after installation of the welch plug, in order to ensure that no air would enter the mixing well, as a result leakage of the fuel can be avoided.
For the purpose of identification, you can use different colors so that the work of the previous repair person can easily be identified. Make sure that you install it in the same position as that of the original one. As an integral part of the fitting strainer might be a part of some diaphragm carburetors. Replace the fittings if the strainer is not possible to be cleaned or lacquered.
Carefully insert the tip inside the carburetor body while installing a fitting. Using a Loctite grade A coat the exposed portion of the shank and press it in until the shoulders come in contact with the carburetor body. To successfully remove plastic part of inlet fitting, a plier or vise can efficiently be used. First of all on the air horn of the carburetor, place the choke plate. It is very important that the flat surface must face downwards.
Each carburetor as designed to operate, can operate only in one way, however the choke plates can operate in both directions also. Make sure these choke plates are assembled properly to operate in right direction for your engine. NOTE: While reinstallation of choke or a throttle shutter, always use a new screw s. Old screw s must never be reused. NOTE: One thing that needs to be taken care of is that the binding must not occur. In case if there is no designation mentioned, then the general sequence of installation is the gasket, diaphragm and cover in the end.
There rings on the emulsion need to be removed while servicing these carburetors. The tube bends a 90o hook in a paper clip or stiff wire to remove. Reach inside the venturi and try to push out the main nozzle emulsion tube as far as possible.
Try to Hook the wire inside the air bleeding hole and carefully pull out to remove. To put tension on the tube in order to force it towards the gasket, an emulsion tube spring in the Vector as well as Series 7 carburetor can successfully be used. This can be efficiently used to seal the tubes thereby to prevent inflow of any unmetered air into the center leg. The proper series can be firstly float bowl then the spring, the tube, gasket and towards end is the carburetor body.
The emulson tube can be removed by gently grabbing the tube with a needle nose plier and pulling it out straight. Replace the tube in case if it is distorted or damaged. Occasionally, on the dual system carburetor equipped engines, some rich starting conditions may have occurred at times when the engine is warm.
Using the white plastic spacer this can efficiently be corrected as shown and at the same time inserted in to the center leg of the carburetor. Service To reduce considerably the amount of prime charge into main nozzle area this spacer has been designed for a better starting under the warm engine conditions. One must replace carburetor primer bulbs with care. Hard starting or non-starting problems can be caused on the usage of the wrong primer bulb. Currently, TecumsehPower makes use of four different carburetor mounted primer bulbs.
Use the Master Parts Manual to avoid problems during the correct application. The primer bulbs five in number currently makes use to feature two different shapes; derby and stepped or hourglass and similarly two different venting types; internal as well as external.
In order to force easily a charge of air directly into the bowl through the atmospheric vent chamber stepped primer bulb can efficiently be used. The sealing surfaces as pictured prevent this air from going back into the air filter.
NOTE: A Bowl prime system needs a great gasket seal on the bowl or otherwise a low prime charge might be generated. Caution: While removing retainer, in order to avoid serious eye injuries, it is important to wear safety glasses or goggles. Grasp the bulb with a plier to remove the primer bulb by twisting and pulling it out of the body. Another added feature of this carburetor includes serviceable main nozzle emulsion tube. Mainly used for on outboards engines, series 2 are yet another entry into the list of carburetors.
As compared to series 1 these are quite similar with only difference being that it comes with a remotely adjust idle mix screw along with an in built fuel pump. Inside the fuel pump, element alternately inflates and then deflates with the pulsations of crankcase that would alternately open and close the flap valves inside. It has been observed that deviation from this angle can damage the diaphragm.
Mainly used on 8 through Identification mark is the presence of bosses, symbolic on each side of an idle mixture screw. Series 3 and 4 come with really delicate piece of distinction and these generally come with emission equivalent that has a fixed idle as well as main. The idle restrictor of these carburetor comes with a cap that is removed as soon as the machine comes in use.
Few features like fixed main jet along with bowl nut, Aball plug as well as serviceable main nozzle emulsion tube remains same as in the series 1 emission. The major point of difference among series 3 and series 4 lies on the fact that in series 3 one screw is on the throttle and choke plates whereas series 4 comes with two screws on throttle as well as choke plates. A Vector Carburetor is a non-adjustable float feed having 1 piece extruded metallic aluminum body.
All the components of these type of carburetors like float bowl, fuel bowl, needle, float, nozzle and venturi , seat and nozzle emulsion tube can easily be serviced without any need to remove the entire carburetor body out from the engine.
This series of carburetors comes with each 2 and 4-cycle engines. As compared to dual system carburetors, their venturi is comparatively larger and these make uses of a simple idle system. With all nonadjustable variants, their 4 cycle version comes with a provision of a stepped primer bulb. However few basic difference points are:. Mainly put to use in case of medium sized frame overhead valve engines with a vertical shaft, series 7 forms efficient emission grade carburetor.
Tecumseh series 7 carburetor parts comes with mounted main as well as idle jets that are ideally placed within the bowl of the carburetor. Basically all the parts can be serviced without any need to remove whole carburetor body out of the engine.
Series 8 comes with both mounted as well as main idle circuit. By means of a restrictor jet, the fixed idle setup has been made possible.
Alike all the other series a models Cap feature on idle restrictor jet can also be traced down in this model. Additionally, these types also include the feature of being able to service the main nozzle within the emulsion tube along with a stepped primer bulb.
Tecumseh carburetor series 9 is an associated emission that makes use of identical carburetor body as that in the case of series 8 however with a common mounted idle system that is identical to the one used in the case of series 6.
This series can easily be identified by the unique ability to service the main nozzle within the emulsion tube, stepped primer bulb and the provision of a non-drilled idle inter mixture well. These unique feature makes this carburetor different from others. With a great similarity to series 8, the series 10 has a slight difference with just an addition of choke. A fixed idle main feature is also been provided to assist easy start during cold weather.
Series 11 has a provision of fuel chamber, assembled to the carburetor from where fuel is fed into the venture throughout the starting warm up period. The feature has been introduced mainly to eliminate surging, hunting, and false starts and has proven out to be of quite a use in eliminating these.
A black restrictor cap can easily be used for the identification purpose. The gray is whereas is part number. One of the most striking features includes the metering jet that can easily be seen upon fuel well removal but Welch plug is a non-serviceable portion.
Most likely preference had always been to soak a carburetor not more than half an hour but series 11 is the exception. For safe working, it is important to service all Tecumseh Power carburetors keeping in mind carburetor safety making use of a. These types of carburetors possess a great similarity with the dual system carburetor.
The fuel inlet angle is completely adjustable. Fuel inlet angle is connected to the body of carburetor making use of a banjo bolt. Most common use of these series is found in TVS rotary lawnmower engines. These come with a fixed main, bigger venturi along with an idle that can easily be adjusted.
Few outstanding features includes a non-metallic choke shaft, non corroding float and a very useful viton tipped needle. Walbro name can easily be found on the body of carburetor and founds application on plenty of OHV engines. With an option of easy to be designed on fully easy to adjust, single adjust or non- adjustable carburetor these comes with a large venturi. One of the best features to recognize these types are the large square mountings surface that can be located on the choke end.
Best application is its use on OH cast iron engines. One of the striking features of this type is that as compared to float style carburetors, diaphragm can easily be operated at even severe angles.
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