Tecumseh Engine Troubleshooting Diagram Schematic

Mixture adjusting needles have a critical taper on the end that is easily damaged from overtightening or abuse. Check these parts if your carburetor is difficult to adjust.

All fuel tanks provided by TecumsehPower have a 75 micron stainless steel filter screen molded right into the tank over the fuel outlet. On TC series engines, a fuel filter is located on the fuel line in the tank. These filters can become restricted when foreign debris enters the tank or when varnish and gum [...]

Care must be used when replacing carburetor primer bulbs. Using the wrong primer bulb could cause hard starting or non-starting problems. Currently, TecumsehPower uses four different carburetor mounted primer bulbs. To avoid problems, use the Master Parts Manual for the correct application. The five primer bulbs currently used feature two different shapes; derby and stepped [...]

Occasionally, on engines equipped with the dual system carburetor, some rich starting conditions have occurred when the engine is warm. This can be corrected using the white plastic spacer as shown and inserted in the center leg of the carburetor. (Service # 632158). This spacer is designed to reduce the amount of prime charge in [...]

The emulsion tube spring in the Vector and Series 7 carburetor is used to put tension on the tube forcing it towards the gasket. This seals the tube, preventing unmetered air from entering the center leg. The proper sequence is float bowl spring, tube, gasket and carburetor body. To remove the emulsion tube, gently grab [...]

Some carburetors use a serviceable emulsion tube sealed with “O” rings on one or both ends. When servicing these carburetors, the “O” ring(s) on the emulsion tube needs to be removed. During the removal of the tube the “O” ring on the venturi end of the tube may remain stuck in the center leg of [...]

If the carburetor has an “F” designation on the casting, it will identify the installation sequence of the gasket and diaphragm on the carburetor. “F” designated carburetors have the diaphragm installed first then the gasket then the cover. If there is no designation, the sequence is then gasket, diaphragm and cover.

Place choke plate into air horn of the carburetor. Make sure the flat surface is facing down. Choke plates can operate in both directions, however, each carburetor is designed to operate only one way. Make sure it is assembled properly for your engine. NOTE Always use a new screw(s) when reinstalling choke or throttle shutter. [...]

To remove a leaking or damaged fuel inlet fitting, use a 1/4″ bolt, 1/4″ nut and 1/4″ washer, along with a 1/2” nut. Use a pliers or vise to remove the plastic part of the inlet fitting. Tap the inside of the remaining metal portion of the fitting using a 1/4″-20 tap. Place a 1/2” [...]

If necessary, this fitting can be removed by pulling and twisting. Be sure to install in the same position as the original. Some diaphragm carburetors have a strainer as an integral part of the fitting. If the strainer is lacquered or cannot be cleaned, replace the fitting. When installing a fitting, insert the tip into [...]