IDLE ADJUSTMENT OF HDA NOTE I: With the engine at the idle position the carburetor feeds fuel thru the primary idle hole. The second and third idle holes act as air bleed holes to mix with the fuel to create the correct air/fuel ratio. NOTE II: Both high speed and idle adjustment needles are [...]
OPERATING FUNCTIONS 1. Fuel Inlet: Fuel drawn trom lank enters here. 2. Impulse Fitting: Engines crankcase impulse enters here. 3. Fuel Pump Diaphragm: Activates in response to crank¬case pulse to transfer tuet to pump check valve. 4. Inlet Check Valve: Opens during vacuum pulse. Closes during pressure pulse. 5. Fitter Screen: Filters fuel before [...]
Figure 4-2 illustrates the Vacu-Jet mechanism, which is distinguished by a single pickup tube and tandem discharge ports controlled by flow through a single jet. Figure 4-22 shows the three basic forms of this carburetor.The Pulsa-Jet derives from the Vacu-Jet and in its various permutations uses many of the same parts. The distinction between the [...]
Figure 4-16 is a sectional view of the crossover Flo-Jet, as used on horizontal crankshaft Model 253400 and 255400 engines. This carburetor includes a vacuum-operated fuel pump, illustrated in the next drawing. Needle and seat renewal and float adjustment procedures are as described for the two-piece Flo-Jet. Figure 4-17 illustrates the assembly sequence for the [...]
Tecumseh L Head governors components.
Tecumseh L Head Carburetor Parts Schematic
This type of carburetor uses a rubber-like diaphragm which is exposed to intake manifold pressure on one side and to atmospheric pressure on the other. Tecumseh diaphragm carburetors use the diaphragm as a metering device. As the intake manifold pressure decreases due to downward piston travel, the atmospheric pressure on the vented side of the [...]
A float is used to maintain the operating volume of fuel in the carburetor bowl. As the fuel is used by the engine, the fuel volume in the carburetor bowl drops and the float moves downward. This allows the inlet needle valve to move off the sealing seat. Fuel flows by gravity or a pulse [...]
When a conductor (alternating coils) cuts the magnetic field generated by the magnets in the flywheel, a current will be induced in the alternator coil. The permanent magnets in the flywheel have a magnetic field in which the lines of magnetic force run from the North Pole to the South Pole. As the flywheel rotates [...]
After all of the safety interlock switches have been activated, the starter switch will complete the circuit. A strong magnetic force is produced by the electrical current running through the armature windings. The armature magnetism repels the magnetism produced by the permanent field magnets of the electric starter. The repelling magnetic forces cause the armature [...]
Powered by Yahoo! Answers