Outdoor compressor unit maintenance. A-Frame Evaporator Coil Inspection Homeowners are often concerned the interior or upwind side of the air conditioner A-Frame evaporator coils that are hidden from view may be clogged with mold, algae, dirt, pet hair and other debris that gets past the air filter. The problem is the A-frame evaporator coils are sealed on both ends by the metal support plates preventing access to the interior of the A-Frame coils.
This is accomplished by a butterfly valve in the throat of the carburetor, at the very top. This is the automatic choke. This terminal on the coil is simply a convenient point to provide power to these components when the ignition is on.
It is very important to note that in VW wiring, black insulation means "has power with the ignition turned on. When you press the throttle, the stepped cam on the left side of the carburetor left is left side of the car will rotate to match the closed choke and so will hold the throttle at high-idle, which is needed to keep a cold engine running.
When you turn the ignition on, power flows to the coil for the ignition system; it also opens the idle fuel cutoff valve solenoid so the car will idle, and it also starts opening the choke.
A heating element the round thing on the right side at the top of the carburetor expands as the electrical current to it warms it up. This starts to slowly open the choke and rotate the stepped cam so that the high-idle gradually drops back to normal. It takes about a minute for the choke to open completely depending on how cold the weather is to start with.
When the choke is fully open, the butterful valve in the throat of the carburetor will be standing straight up. This gets heat into the engine at about the same speed as the choke opens up, so the car will run smoothly with choke on a cold morning, and also run smoothly as the engine warms up.
On a really hot day, the choke will not close up much at all with the engine off, as the engine is already somewhat warm per the ambient temperature. Just under the accelerator pump delivery tube is the choke butterfly.
Pull the throttle arm back gently and rotate the stepped cam rearward. As you do this, the choke should close across the throat of the carburetor.
As indicated, the guts of the automatic choke are located on the right side of the carburetor at the top. The mechanism consists of a bi-metallic coiled spring inside of the round outer cover. The cover is held in place by a metal retaining ring with three screws.
The spring unwinds at the same rate as the engine warms hopefully. There is a hook on the end of the bi-metallic spring that controls the choke shaft running into the carburetor, which rotates the choke butterfly valve.
As the bi-metallic spring warms up it slowly opens the butterfly valve in the throat of the carburetor, producing a progressively leaner fuel mixture. At the same time the high-idle gradually drops back to normal. Once the engine is fully warm, the choke butterfly will be fully open i.
So it dies at idle for some time until the engine does get up to running temperature. No amount of adjustment will force the butterfly to close all the way.
I took the automatic choke in my old carburetor partially apart last night to see if I could diagnose the problem. There is a curved slot in the plastic insert inside the mechanism that the lever on the choke shaft runs through.
My first thought was that perhaps this plastic insert was installed incorrectly. But on examination of the insert from my old carburetor, it is obvious that the insert goes in only one way. A tongue-in-groove arrangement assures this. So then I turned my attention to the vacuum mechanism.
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There is a diaphragm inside with a notched rod attached the vacuum diaphragm rod, the manual calls it that runs into the automatic choke. This diaphragm inside the vacuum mechanism is spring-loaded and actuated by vacuum from the base of the carburetor, below the throttle butterfly. When vacuum is applied, the diaphragm is pulled in against the spring, pulling in the attached rod, closing the choke and enriching the mixture.
If the vacuum mechanism failed that is, if the diaphragm failedthe spring would keep the vacuum diaphragm rod pushed into the choke all the way all the time.
In this event only the bi-metallic spring would be controlling the choke -- when cold, the bi-metallic spring would be pushing the lever down as far as it could, limited by the OTHER rearward end of the notch in the vacuum diaphragm rod!WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, cadmium and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
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A New Smaller UAV for Personal or Commerical Use. How do I get volts out of my Onan? "I (actually my chief engineer) split the two coils to provide separate to two separate circuits. Two hots and a ground give you if . Back to Introduction Sub-Table of Contents.
Organization of This Document For the most part, we assume that your are somewhat familiar with basic electronics and your intended application - be it for photography, measurement, or entertainment. How the Fluorescent Lamp Works, History of the Fluorescent Lamp, Hot and Cold Cathode Lamps, Photos.