Aball plug is visible from the bottom, which seals the passage. This carburetor also has a serviceable main nozzle emulsion tube. Series 2 carburetors were used on outboard engines.
This carburetor is the same as the Series 1 with the exception of the remote adjustable idle mixture screw, and a built in fuel pump. Series 2 carburetors have a built-in fuel pump consisting of a fuel pump element which inflates and deflates with crankcase pulsations which opens and closes two flap valves in the fuel pump, thereby pumping fuel from a remote tank to the carburetor float bowl.
When replacing the fuel pump element, install with the slot opening at a 45 o angle as illustrated. Installation in any other position will damage the diaphragm. Series 3 and 4 carburetors are generally used on 8 through The venturi size of these carburetors are larger than Series 1 and Dual System Carburetors. The quickest way to identify these carburetors is by the presence of bosses on each side of the idle mixture screw.
To determine whether the carburetor is a Series 3 or Series 4, look at the throttle or choke end of the carburetor. The Vector carburetor is a float feed, nonadjustable carburetor, with a one piece extruded aluminum body. The float bowl, float, nozzle, and venturi are nonmetallic, which eliminates the corrosion and varnishing problems associated with similar metallic parts. Common service areas of the carburetor are contained in the fuel bowl, which include the float, needle, seat and main nozzle emulsion tube.
All of these parts can be serviced without removing the carburetor body from the engine. If the unit was run with poor filter maintenance the venturi should be removed and the air bleeds cleaned with solvent. Series 6 carburetors are used on 2 and 4-cycle engines. They have a larger venturi than the dual system carburetor and use a simple fixed idle system. Series 6 carburetors used on both vertical and horizontal applications are nonadjustable.
The 4-cycle version pictured has a stepped primer bulb. The bowl nut is left-hand thread. This bowl nut is identified by an "L" stamped on the nut and the international left thread notches across the points. A dampening spring is installed on the float hinge pin to reduce erratic float travel. The two mounting bosses extend out from the carburetor body. The Series 7 carburetor is an emissions grade carburetor used on medium frame vertical shaft overhead valve engines.
It has a non-metallic bowl and a snap-on bowl retainer to connect it to the carburetor body. This model has a fixed main jet and a fixed idle jet; both are located in the carburetor bowl. The float bowl, float, nozzle, and venturi are non-metallic, which eliminates the corrosion and varnishing problems associated with similar metallic parts.
The Series 8 carburetor has both a fixed main and idle circuit. The fixed idle system is achieved by a restrictor jet that meters the fuel for the idle circuit. A ball plug is visible from the bottom, which seals the passage. It also has a stepped primer bulb. Table of Contents Introduction. Use only genuine TecumsehPower service parts. Enlarge passages. Soak carburetor in a cleaner over 30 minutes.
Reuse original choke and throttle shutter screws. Interchange bowl nuts. In order for the engine to operate properly, the following items need to be checked first: 1. NOTE On older point ignitions models check for proper ignition timing according to the Technician's handbook.
Then run the engine until any remaining fuel is consumed. Doing so may result in death or serious injury. The float must "float" on top of the fuel while fuel is inside the bowl. If it has fuel inside the float, it will be heavy and will sink.
If your float is clear plastic, you can see the fuel inside the float. In either case, replace the float. If the float is not sinking, then you may have a leaking inlet needle valve or seat. This valve is inside the fuel inlet port of the carburetor. You must remove the float to get to the inlet needle.
Under the needle is a seat. Most of the times, Tecumseh uses a small rubber donut type of seal for sealing the tip of the needle. If this seat is installed improperly it will leak around the needle tip. If it is swolen, it will pinch off the fuel flow not letting fuel enter the float chamber. If you remove the seat, install a new one. The inlet seat must be installed properly for it to work correctly see figure 1.
Special note: If you are transporting any machine in car, truck, or trailer, you should shut off the fuel valve so the carburetor will not leak. As a machine riding in the back of a truck or trailer "bounces" around, it will cause th float inside the carburetor to also bounce and this up and down motion will permit the inlet needle to rise up and down, subsequently allowing excess fuel to enter the carburetor.
Shut off the fuel inlet valve to prevent from happening. Sometimes the Carburetor does not require repair, it is simply no fuel is getting into the Tecumseh Carburetor.
Some Tecumseh Engines have a fuel filter between the fuel tank and the Carburetor. Just because there is a filter in the fuel line does not mean you can not have something preventing fuel flow into the Carburetor. A piece of the rubber fuel line can break of inside the fuel line and enter the fuel inlet of the Carburetor blocking partially or completely the required fuel flow into the Carburetor.
Remove the fuel line and look into the inlet. If you find something, a complete repair may not be necessary. Try removing the obstruction prior to opening the carburetor, disturbing the bowl seals. Is one of the two screws missing? Turn the adjustment screw clockwise until the needle valve is closed and seated at the bottom.
Make sure you do not overtighten or you will damage the valve. Turn the adjustment screw counterclockwise until the engine is about to stall out from too much fuel.
Turn the adjustment screw back clockwise to the midpoint between too little fuel and too much fuel. Carl Pruit has been a freelance writer since , specializing in service journalism and travel. His work has appeared on various websites.
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