Aircraft Carburetor - Quality Aircraft Accessories stocks a wide variety of Marvel Schebler carburetors. Browse our selection of Marvel Schebler carburetors below. If you can't find the Marvel Schebler carburetor you need, contact us with your Marvel Schebler carburetor request.
This carb is for a 135 Lycoming. Spruce helped to expedite the shipping to me. It replaced a carb I last overhauled in the 90s! It installed with only the throttle arm needing adjust. After start-up Only the idle mixture needed a slight adjustment.
Aircraft Carburetor
Engine runs better than ever! The majority of carburetors used in general aviation are the float type. This means that the carburetor has a bowl which is filled with fuel to a level regulated by a float attached to a needle valve.
Carburetor – Marvel Schebler
Fuel enters the bowl through a strainer which filters the fuel. As the fuel level increases, the float rises and the needle valve, which is attached to the float by a lever, closes and shuts off the fuel flow until the float level drops again.
#2. Corrosion – Corrosion, as the result of water contamination, is another common problem with carburetors that sit unused. The clip that the float mounts on is made of steel and can rust significantly if exposed to water.
The same is true of the spring arm on the mixture control metering sleeve. Even the accelerator pump plunger has a steel spring (under the leather) that can corrode. TIP #1: Find a cleaner that is strong enough to remove varnish, yet gentle enough to prevent damage to any non-metallic parts.
Cleaners that immerse the carburetor in solvent are too strong. In fact, Marvel Schebler has a service bulletin requiring the replacement of non-metallic parts that have come into contact with this type of cleaner. Wondering what to expect when you trust Aircraft Accessories with your next aircraft carburetor project?
Basic Carb Functionality And The Things Mostly Likely To Mess It Up
Our talented team of carburetor specialists will gladly provide you with a custom quote on request. For general questions, or to request a free quote, call or message us today. They shipped the same day. I got it the next day.
It looked like new and solved my problem of a rough idle at low speed. I received full credit for the core in five days after I returned it to the store. I'm very satisfied. Tom
If you will be returning a core, no RMA is required. We recommend sending a copy of your invoice and "Core Return" written in large letters on the bottom. This ensures we know who and what the received shipment is for.
All product images on QAA.com are for illustration purposes only and do not represent an exact representation of the product that will be delivered. Please order your product based on the correct part number, not the image shown.
Carburetor – Marvel Schebler
Engines need fuel to provide the energy needed to produce power. Most planes in the general aviation fleet employ a carburetor to provide a combustible mixture of fuel and air. It is the job of the carburetor to measure the amount of incoming intake air and meter out the proper fuel/air ratio to the cylinder intakes.
Quality Aircraft Accessories stocks a wide variety of Marvel Schebler carburetors. Browse our selection of Marvel Schebler carburetors below. If you can't find the Marvel Schebler carburetor you need, contact us with your Marvel Schebler carburetor request.
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician.
Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Carb Cleaning Tips
Air enters the carburetor and travels through a venturi. The venturi accelerates the airflow and causes the pressure of the air to drop. A nozzle is placed in this area of low pressure and is connected to the fuel bowl.
The low pressure creates suction on the nozzle and fuel is discharged into the air stream. When the fuel is discharged it also vaporizes. When the throttle is opened rapidly, the airflow increases suddenly and there is a slight delay in the suction on the nozzle increasing the fuel flow to meet the increase in airflow.
In order to compensate for this, some carburetors use an accelerator pump. This is basically a "plunger" that shoots extra fuel into the air stream when the throttle is advanced rapidly. Accepted returns must arrive at our facility within 30 days from the invoice issue date with complete paperwork and in original packaging condition or the customer will be refused a refund or credit.
All items are subject to a 15% restocking fee. The amount of suction on the nozzle is regulated by the mass airflow going across the nozzle. The amount of airflow is controlled by the throttle valve (aka a "butterfly" valve) located downstream of the venturi and discharge nozzle.
If the throttle valve is closed by the pilot moving the throttle cable, the airflow is reduced. When the pilot pushes the throttle cable in, the butterfly valve is opened and airflow and suction on the discharge nozzle are increased.
When the throttle cable is pushed in all the way, the butterfly valve is "wide open." The most common type of aircraft carburetor is the float carburetor. In this component, the fuel level in the fuel chamber is regulated by the action of a floating valve.
As the level of fuel in the chamber rises and falls, the float opens and closes the fuel valve, keeping the fuel level constant. If the fuel level in the chamber rises above the level of the discharge nozzle, fuel can leak from the carburetor when the engine is off.
I haven't flown it with the new carb, but my mechanic says it runs much better. The package arrived in just a couple of days, very well packaged. I sent the core back in the same box.
It was easy. Thx For aerobatic aircraft and aircraft subject to negative g-force, float carburetors are problematic. When inverted, the float is useless at keeping the fuel level constant, allowing the chamber to quickly fill with fuel.
In these aircraft, pressure carburetors are used instead. These utilize diaphragms and a series of chambers to control the mixing of air and fuel. Pressure carburetors are automatically altitude-controlled and aren't impacted by g-force or inversion.
The aircraft carburetor is used to mix air and fuel in the proper ratio for optimal combustion in the aircraft's engine. Once the carburetor brings the fuel and air together, the mixture flows to each engine cylinder, where it is ignited.
The mixture control on the carburetor controls the amount of fuel coming out of the discharge nozzle. The throttle controls the amount of suction, but the mixture controls the amount of fuel, and allows the pilot to adjust the fuel-to-air ratio.
The packaging for the carburetor was excellent, no damage on arrival. After removing the carburetor its appearance was like a brand new model. After installation the engine fired up after just 3 blades and ran perfectly.
The mixture and throttle worked perfectly. This overhauled unit was a great purchase. The carburetor is an old, simple, durable invention that provides many years of use—that is, if it's properly maintained. However, properly cleaning a carburetor can sometimes be tough, so here are some words of advice that will help you save both time and money:
#1. Stagnant Automotive fuel – Automotive fuel can cause problems if the plane sits for long periods of time. The mixture control ends up getting seized in the idle cut-off position. The mixture control lever is connected to a mixture valve metering sleeve through an arm that is comprised of a tightly-woven spring.
The metering sleeve can become seized in the brass housing in the carburetor. Once the mixture control is shoved forward in the cockpit, the spring arm of the metering valve gets mutilated because the bottom part is frozen in the carburetor.
Repair requires disassembly of the carburetor. The venturi in the carburetor is the subject of a couple of FAA Airworthiness Directives. The two-piece styles atomize the fuel better, but sometimes come loose. The one-piece styles don't come loose, but sometimes require a new nozzle to help properly vaporize the fuel.
#3. Time and Wear – Of course, general wear and fatigue will also cause carburetor problems. The accelerator pump is connected to the throttle mechanism through a horseshoe-shaped metal clip. This clip often wears out. Over time, the throttle butterfly valve shaft and the mixture control lever in the carburetor housing also wear, as do the needle valve and seat.
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