Stromberg

Note: Picture to be used for reference only. Carburetor models may vary.

Note: Please read the WARNINGS below.

NOTE: Our full gasket kit will help seal the carburetor in the event of leaks (and clean, new gaskets are always recommended when any carburetor is taken apart), but it always pays to check and repair all the gasket surfaces for cuts, nicks or grooves that can cause poor sealing. It is also a good opportunity to remove any dirt and other foreign materials from the carburetor.

PARTS REPLACEMENT

a) Disconnect the accelerator pump rod (3) from the ball sockets at each end. Disconnect the choke valve tension spring (14) using small pliers, and remove the choke lever fulcrum screw (1). Remove the five airhorn screws (31) and their lock washers. Lift the airhorn (32) off, with the accelerator pump (10) attached. Remove the airhorn gasket (20) at the same time.

b) Remove the small split (cotter) pin from the top of the accelerator pump, then use a small screwdriver or pliers to unhook the spring (33) from the accelerator pump fulcrum lever (34). Now remove the screw (35) to release the lever from the airhorn casting. Now you can remove the accelerator pump down through the casting. Replace the felt gasket at the top of the pump with the new one from the kit.

c) Remove the three bowl casting screws (24) and their lock washers and lift the bowl casting (23) from the throttle body (base) (9). Lift off the gasket (25), replace the new one on top of the throttle body and fix the bowl casting back on, remembering the three lock washers. Tighten the screws gradually to 10 in/lb torque. Do not over- tighten

d) Remove the three bowl plugs (48 x 2 and 43) and their gaskets (44) from beneath the float bowl. Inspect the three plug gasket surfaces in the bowl casting. If you see anything that might prevent the gasket from sealing, you may need to spot face the gasket surface to get a good fuel-tight seal. A good machine shop can do this for you using a 0.6in OD cutter tool. With good gasket surfaces, fit a new ring gasket (44) to each bowl plug and install them back into the casting. Note: The kit includes two spare bowl plug gaskets for future use (eg. when changing jets). Take care to avoid cross-threading the plugs into the castings, especially the outer ones. And use the widest screwdriver blade you can, to avoid marking the slots in the plugs.

e) Remove the power valve (28) and its ring gasket (29) from the bottom of the accelerator pump well. We recommend a wide, flat blade screwdriver with a slot cut in the the blade to clear the delicate pin in the top of the power valve. Failure to use a correct tool may damage the power valve. Place the new gasket (29) on the power valve (it’s the smallest one in the kit) and fix the power valve back into the casting. Do not over-tighten.

f) Install the top of the accelerator pump (10), back into the airhorn casting from underneath, then install the spring (33), lever (34) and screw (35), reconnecting the pump to the lever as you go. The ball on the end of the lever points outwards as in the diagram. Do not hook the spring on the lever yet. Place the new airhorn gasket (20) – the right way around! – on the bowl casting and sit the airhorn back on, taking care not to wrinkle the leather seal or catch it on the slot in the pump well. Don’t allow the pump to rise upwards or it could catch again. Now fasten the airhorn down with the five lock washers and screws to 5in/lb torque. Attach the choke tension spring and connect the choke lever to the airhorn with the screw. Reconnect the accelerator pump rod (3) and flip the pump lever spring back onto the lever.

g) Finally, remove the inlet valve (37) – needle and seat or Stromberg S-jet – using an 11/16th open-end wrench and swap in the new ring gasket. If you are simply swapping gaskets, the float level adjustment should remain the same. The final gasket to be replaced – the manifold gasket (6) – goes between intake manifold and carburetor when you fix it back onto the engine.

You’re done! If you think we’ve missed anything or we could improve on this Genuine Stromberg ‘How To’, please let us know. Email – tech@stromberg-97.com

WARNING: These instructions, including the diagrams, must be read and fully understood before installation begins. Failure to follow these instructions may result in poor performance, vehicle damage, personal injury or death. If these instructions are not fully understood, installation should not be attempted.

Before installation, please check you have the correct product for your Stromberg application. If you have any questions, contact your authorized Stromberg dealer or email us – tech@stromberg-97.com.

These instructions, warnings, cautions, and notes are limited to replacement of the parts named in the Service Kit. Stromberg has separate instructions for carburetor rebuilding, installation and set­up.

WARNING: Before working on any carburetor, it should be removed from the car and dried of any fuel as gasoline and gasoline vapors are very flammable. Never smoke, use an open flame, or produce any sparks where gasoline or gasoline vapors could be present. Doing so may cause a fire or explosion, resulting in property damage, serious personal injury, or even death.

WARNING: Always perform any work on the fuel system in a well ventilated area. Failure to do so may result in the build up of dangerous gasoline or other combustible vapors that may cause severe respiratory injury, or a fire or explosion, resulting in property damage, serious personal injury, or death.

WARNING: A thorough knowledge of carburetor function and repair is required. Therefore, Stromberg recommends that rebuilding and installation be performed only by a professional auto mechanic. An improperly rebuilt or installed carburetor may cause poor performance or lead to property damage, personal injury, or death, and may void your warranty.

WARNING! When replacing the carburetor onto the engine, always ensure you have connected all of the linkages – throttle, choke, accelerator pump – and fuel lines correctly. Manually operate the throttle lever and choke mechanism to ensure free movement. Any sticking, binding, or ‘over-center’ movement in the linkage could result in uncontrolled engine speed, property damage, serious personal injury, or death.

WARRANTY
While the individual parts in this Service Kit are covered by the Stromberg Carburetor Limited Warranty, the use of this Service Kit does not guarantee that the rebuilt carburetor will deliver correct performance and economy. For full details of the Stromberg Carburetor Limited Warranty, please go to www.stromberg-97.com