How do I Replace a Motorcraft 4350 Carb?

Seeing only limited use on late model 1970s Ford and Jeep engines, the Motorcraft 4350 is a spread-bore carburetor made by the Ford Motor Company. Because of the unusual spread-bore design, the 4350 is not readily interchangeable with other carburetors; the only option for replacement is to locate a rebuilt model. Once obtaining a replacement, the most difficult part of replacing the Motorcraft 4350 carburetor is removing the old carburetor from the engine.

Instructions

1

Pull the vacuum lines from the air filter housing with your hands, loosening any clamps with a screwdriver or pair of pliers. Twist the wing nut from the top of the air filter housing with your fingers. Pull the air filter housing from the carburetor.

2

Disassemble the throttle linkage, located on the right side of the carburetor as you face the vehicle. Remove the nut from the linkage bolt with a wrench. Pull the retaining clip from the linkage with a pair of pliers, if necessary.

3

Pull all vacuum lines from the carburetor with your fingers.

4

Place a rag under the junction where the fuel line connects the carburetor. Loosen the fuel line from the carburetor with a wrench. Place a second rag over the top of the fuel line and remove the fuel line from the carburetor with your fingers, allowing the rags to absorb any gasoline that drips from the line.

5

Remove the main bolts at the base of the carburetor with a wrench. Wiggle the carburetor loose with your hands. If the carburetor won't budge, gently tap at the base plate of the carburetor with a rubber mallet. Do not use a metal hammer, hit the body of the carburetor or lose your patience; keep working at it, alternating between tapping with the mallet and wiggling the carburetor with your hands. It will come loose -- eventually.

6

Stuff clean rags into the throat of the intake manifold and clean the surface of the manifold -- where the base of the carburetor was attached -- with carburetor cleaner and coarse-grade steel wool. Remove the rags from the manifold. Run the hose of a vacuum cleaner over the top and inside the throat of the manifold, removing any loose debris and residue.

7

Place the new carburetor gasket over the top of the manifold, making sure all the holes in the gasket line up perfectly with the holes in the manifold.

8

Bolt the new carburetor in place with a torque wrench according to the specifications for your vehicle. Find torque specifications online, or call a dealership or auto parts store. Reconnect the fuel and vacuum lines to the carburetor. Reinstall the air cleaner assembly and vacuum lines.

9

Start the engine and adjust the carburetor, using a dwell tachometer, according to the specifications for you application. Alternatively, adjust the fuel mixture and idle screws by ear, turning the screws 1/4-turn at a time with a screwdriver until the engine is running smoothly.