Troubleshooting the Stromberg WW & WWC Carburetor
The Stromberg WW and WWC series are robust, two-barrel carburetors commonly found on Chrysler, Dodge, Plymouth, and some GM and Studebaker applications from the late 1940s through the 1960s. While generally reliable, they require precise adjustments and cleanliness to function correctly.
1. Flooding and Fuel Leaks
If fuel is overflowing from the bowl or leaking from the air horn, check the following:
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Float Level: The float level is critical. If set too high, fuel will spill over into the venturi. Ensure the float is not "heavy" (leaking fuel into the float itself).
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Needle and Seat: Inspect for dirt or debris trapped between the needle and seat. Even a tiny speck can prevent a proper seal. Look for a "ring" or wear mark on the needle tip; if it’s worn, replace the set.
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Fuel Pressure: Modern fuel pumps can sometimes put out more than 4-5 PSI, which can overpower the needle and seat on these vintage units. Consider a pressure regulator if pressure is excessive.
2. Hesitation or "Flat Spot" (Acceleration Issues)
If the engine stumbles when you step on the gas, the accelerator pump circuit is likely the culprit.
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Accelerator Pump Cup: Inspect the pump plunger.
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Note: If you are using a leather pump cup, remember that these generally do not use expander springs. To ensure a good seal, soak the leather in oil for a few minutes and gently flare the edges out before installation.
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Check Balls: The Stromberg WW uses check balls to control the flow of fuel in the pump circuit.
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Inlet Check Ball: Ensure the ball in the bottom of the bowl is seating properly. If it leaks, fuel will push back into the bowl instead of out the nozzles.
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Discharge Check Ball: If this ball is stuck or missing, you may experience a delay in fuel delivery or "siphoning" at high speeds.
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Pump Linkage: Ensure the pump rod is in the correct hole for the season (usually a "summer" and "winter" setting) to provide the appropriate stroke length.
