Reassembly and Adjustment

CAUTION check valve, jet, and so forth, a search which is usually held on the floor. . Have a sufficient quantity of carburetor cleaner on hand. CAUTION Wear rubber gloves and eye protection when you use this highly caustic cleaning solution. Use a small wire basket for dipping the smaller parts into the cleaner. When you dip larger parts, use a short piece of wire, such as an old coat hanger, to hang the parts into the cleaning solution. Submerge the parts for at least 30 minutes. During any disassembly operation, be careful not to lose or damage any parts. Keep unauthorized people away from your work area so your parts do not get lost, misplaced, or walk away. Thoroughly rinse the carburetor parts with clean water or solvent and blow-dry them with low-pressure air. Before reassembly, inspect all parts for wear or damage. CAUTION Disassemble the carburetor only as far as you have to. Normally, it is not necessary to remove the throttle shaft and its plates or the choke shaft and its plate. REPAIR AND REPLACEMENT Very little actual repair work is performed on modern carburetors because it is less expensive to replace the unit than repair it. Most repairs you do on carburetors will be in the form of parts replacement. REASSEMBLY AND ADJUSTMENT When you have finished your final cleaning and made the necessary repairs, you are ready to reassemble the carburetor. You do this in reverse sequence; that is, the last item taken out is the first put back. Look at the specification sheet for any special instructions, such as setting the float level and float drop, initial choke setting, initial idle adjustments, and any linkage adjustments. Use care in the assembly process. Carburetor bodies may be made of aluminum, bronze, iron, or even plastic. Overtorquing may damage or warp the parts and lead to expensive repairs or deadlined equipment. TESTING When you reinstall the carburetor on the engine, check all connections for proper attachment. Some manufacturer’s mark, with numbers or letters, individual connections; others color-code the vacuum lines. Remember, the incorrect hookup of emissions control vacuum lines will lead to decreased fuel economy, increased exhaust emissions, or both. WARNING Unauthorized alteration, disconnection, or any tampering with emission control devices in any way is in direct violation with state and federal law. CESE being shipped to overseas locations may be modified according to the manufacturer’s specifications to meet operational requirements as directed by CBC, Port Hueneme, CA, Code 15, COMCBPAC Equipment Office or COMCBLANT Detachment, Gulf Port, MS. To test and adjust today’s carburetor properly, an exhaust gas analyzer is a requirement. Without this machine, it is impossible to know if you are exceeding the allowable ppm (parts per million) emissions of the HC, CO, and C02. There are many different makes of this machine. The information listed here is only to give you a basic understanding of the unit. CAUTION Follow the directions for the hookup of the unit exactly. These instructions may come from the manufacturer’s operating instructions, or even special instructions from the under the hood data plate. Failure to obtain proper hookup may result in testing equipment or vehicle damage. 5-2