Saturday, December 21, 2013
Tools for Carburetor Fuel Air Mixes
The function of a carburetor is to regulate the engines fuel air mixture. If the mixture is too rich, meaning the air content is too low, increased carbonization of the engine can occur. It can also decrease engine performance and increase the chances of smoking. If the mixture is too lean, or the air content is too high, there is less lubrication to the engine which could cause cylinder scoring. Maintaining the proper fuel air ratio is necessary to avoid these problems. This can be done by adjusting the fuel air mix. For most carburetor models, special tools are required to adjust the carburetor. These tools adjust carburetor-specific screws which are now used on most models to prevent adjustment by non-EPA-certified mechanics. Five different carburetor adjustment tools are currently on the market.
Single "D"-shaped Tool
The single "D"-shaped carburetor adjustment tool is used to adjust the tamper-proof adjustment screw found on some carburetor models. Both the tool and the tamper-proof adjustment screw are "D"-shaped. The adjustment of the screw changes the amount of air that is allowed into the engine. By turning the screw in, the amount of air allowed into the engine is reduced, creating a rich fuel air mixture. By turning the screw out, the amount of air allowed into the engine is increased, creating a lean fuel air mixture.
Double "D"-shaped Tool
The double "D"-shaped carburetor tool is used to adjust the double "D"-shaped tamper proof adjustment screw on small engine carburetors. This is done while the engine is running and has had a chance to warm up. This is because the carburetor settings will change once the engine has warmed up.
Hex-shaped Tool
The hex-shaped carburetor adjustment tool is used to adjust the tamper-proof adjustment screw on both small and large engines. The tamper-proof adjustment screw is generally blocked with a cap by the manufacturer to prevent adjustment of the carburetor by non-licensed professionals. Special tools are required for the removal of the cap. The distribution of the cap removal tools are also regulated by the EPA.
Pac-man-shaped Tool
The pac-man-shaped tool is used for the tamper-proof adjustment screw on some Walbro and Zama carburetor models. These tools are also referred to as V-notch carburetor adjustment tools. They are offered to certified mechanics through MTD distributors.
Splined Tool
The splined carburetor adjustment tool is generally used to adjust the tamper-proof adjustment screw on Poulan and Weedeater carburetors. These tamper-proof adjustment screws have four sets of splines each spaced 90 degrees apart.
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