Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ford (AUTOLITE) 2 & 4-Barrel Models 2100 & 4100: Description
Two and four barrel downdraft types with integral main body and throttle body. All models have a throttle operated diaphragm type accelerating pump mounted on side of main body and a vacuum controlled power valve. Automatic choke is mounted on main body and linked to choke valve shaft by linkage. Initial choke opening (for starting) is provided by a choke vacuum piston within the choke housing (on some carburetors, a torsion spring on the choke shaft is used instead of the vacuum piston). Secondary side of 4-barrel carburetors has idle system (no adjustment) and main fuel system only. Secondary throttle valves are controlled by vacuum diaphragm unit mounted on main body (opposite side from accelerating pump) and linked to secondary throttle shaft. Secondary throttle shaft is also linked to primary throttle to ensure positive closing of the secondary throttle valves. Some carburetors have features requiring special adjustments as listed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.