How to Rebuild Weber Carburetors

Edoardo Weber began designing carburetors in the early 1900s. During the 1920s, Weber carburetors were the top choice for use in Maserati and Alfa Romeo racing cars. As with all carburetors, Weber carburetors are subject to a build up of deposits, as well as significant wear and tear. These issues can lead to poor performance, lower gas mileage and stress on the engine. Rebuilding a Weber carburetor consists of replacing gaskets, broken or damaged parts, and a thorough cleaning. Performing the rebuild yourself with a carburetor rebuild kit could save hundreds of dollars.

Instructions

Disconnect the car battery.

Cut several 2- to 4-inch pieces of masking tape and place them in an easily reachable area.

Fill a container with carburetor cleaner. The container must be large enough to fit any part of the carburetor. Fill the container to a depth of 1 to 2 inches.

Label the fuel line, vacuum tubes and choke wires.

Disconnect the accelerator rod by sliding it out of the lever ball joint.

Remove the air cleaner and the air cleaner assembly from the top of the carburetor. Screw off the wing-nut, then lift the assembly off the bolt.

Disconnect the fuel line, choke wires and vacuum tubes. Cap the fuel line and vacuum tubes to avoid contamination.

Remove the mounting bolts and nuts from the carburetor.

Lift the carburetor off the engine block and place it on your work surface.

Scrape off any remaining pieces of the gasket from the carburetor and engine block.

Disassemble the carburetor one piece at a time.

Label each part as it comes off. Use terminology that makes the most sense to you.

Lay the parts out on the work surface. Keep them in the order that they came off.

Inspect each part. Replace any broken or damaged parts.

Clean each part, using the carburetor cleaner and a brush to remove all deposits. If necessary, soak the part in the carburetor cleaner. Use a towel or allow the parts to air dry.

Soak the jets and emulsion tubes in the carburetor cleaner. Do not scrub them.

Clear the jets and emulsion tubes with compressed air.

Reassemble the carburetor in the reverse order of disassembly.

Clean the engine block where the carburetor will be mounted.

Place the new gasket on the engine block.

Set the carburetor on the gasket. Line up the mounting holes.

Replace the mounting bolts. Hand-tighten all bolts before fully tightening them.

Replace the fuel line, vacuum tubes, choke wires and throttle cable.

Replace the air filter and assembly.

Reconnect the accelerator rod by sliding it into the lever ball joint.