http://www.model-a.org/ The Place for Model-A Ford Carburetors en-us Sat, 19 Apr 2008 12:00:00 MDT Sat, 19 Apr 2008 12:00:00 MDT parts@modelastore.com (Bert's Model 'A' Center) parts@modelastore.com (Bert) http://www.model-a.org/order.html Please complete this form and submit with your payment and trade-in, when you are purchasing a restored carburetor or when requesting restoration services. http://www.model-a.org/order.html http://www.model-a.org/flow_diagram.html A schematic representation of fuel and air flow is shown in this diagram. http://www.model-a.org/flow_diagram.html http://www.model-a.org/troubleshooting_chart.html To aid in trouble shooting, common symptoms are noted and their most common causes are identified. There are several file formats available for the Troubleshooting Chart. Please select the type of file that best meets your needs. http://www.model-a.org/troubleshooting_chart.html http://www.model-a.org/default.html Welcome to Model-A.org the place for Model A Ford enthusiasts looking for information on Zenith carburetors. Think of us as the central source for information on identifying and solving your carburetor problems. This site has been developed to assist you and your fellow A-ers in obtaining the information necessary to fix, restore, and enjoy your pride and joy. http://www.model-a.org/default.html http://www.model-a.org/welcome.html Welcome to Model-A.org the place for Model A Ford enthusiasts looking for information on Zenith carburetors. Think of us as the central source for information on identifying and solving your carburetor problems. This site has been developed to assist you and your fellow A-ers in obtaining the information necessary to fix, restore, and enjoy your pride and joy. http://www.model-a.org/welcome.html http://www.model-a.org/basic_info.html When first learning about the Zenith, Model A carburetor, it's good to have to have some background information such as basic information on what the carburetor looks like, how the carburetor works, who manufactured it, and how the design evolved. http://www.model-a.org/basic_info.html http://www.model-a.org/controls_adjustments.html Controls and adjustments to be mastered as you gain experience. http://www.model-a.org/controls_adjustments.html http://www.model-a.org/problem_solving.html Are you thinking that you might have a carburetor problem? This guidance should help you investigate and solve the problem. http://www.model-a.org/problem_solving.html http://www.model-a.org/components.html Before installing components into a carburetor, one should have a good knowledge about the components, clean them, inspect them, and repair or replace them as is necessary. http://www.model-a.org/components.html http://www.model-a.org/components_full.html Before installing components into a carburetor, one should have a good knowledge about the components, clean them, inspect them, and repair or replace them as is necessary. http://www.model-a.org/components_full.html http://www.model-a.org/tools.html When working on Zenith, Model A carburetors there are some tasks, which are made easier or more effective with "Special Tools," that may not already exist in one's tool box. These are the ones that I use the most. http://www.model-a.org/tools.html http://www.model-a.org/tools_full.html When working on Zenith, Model A carburetors there are some tasks, which are made easier or more effective with "Special Tools," that may not already exist in one's tool box. These are the ones that I use the most. http://www.model-a.org/tools_full.html http://www.model-a.org/procedures.html Often perceived carburetor problems are actually the result of using improper procedures. So, applicable procedures are documented here. http://www.model-a.org/procedures.html http://www.model-a.org/procedures_full.html Often perceived carburetor problems are actually the result of using improper procedures. So, applicable procedures are documented here. http://www.model-a.org/procedures_full.html http://www.model-a.org/assembling.html Before installing components into a carburetor, one should have some knowledge about each of the components, clean them, inspect them, and repair or replace components as is necessary. If you have not already done so, go to for this information. Then, you will be ready to assemble lower carburetor assembly, upper carburetor assembly, put them together, install the carburetor on vehicle, and test it. http://www.model-a.org/assembling.html http://www.model-a.org/for_sale.html Alternatives for obtaining a good running Zenith carburetor. http://www.model-a.org/for_sale.html http://www.model-a.org/swap_meet.html When you are at a Swap Meet looking for a Zenith, Model A carburetor to restore or to use as a trade-in, there are some things you should be looking for. http://www.model-a.org/swap_meet.html http://www.model-a.org/other_carbs.html A number of alternatives to the Zenith, Model A Ford carburetor became available for use during the Depression era. In addition to the carburetor used on Model B Fords, there were many other after market carburetors. http://www.model-a.org/other_carbs.html http://www.model-a.org/other_carbs_full.html A number of alternatives to the Zenith, Model A Ford carburetor became available for use during the Depression era. In addition to the carburetor used on Model B Fords, there were many other after market carburetors. http://www.model-a.org/other_carbs_full.html http://www.model-a.org/resources.html These books, links, and videos are good sources for additional information on the Model A Ford carburetor. http://www.model-a.org/resources.html http://www.model-a.org/contact.html http://www.model-a.org/contact.html http://www.model-a.org/safety_first.html Your safety should always come first. http://www.model-a.org/safety_first.html http://www.model-a.org/symptoms.html To aid in troubleshooting, common symptoms are noted and their most common causes are identified. http://www.model-a.org/symptoms.html http://www.model-a.org/so_called_carb_symptoms.html Many so-called "Carburetor Symptoms" can also be caused other sources. http://www.model-a.org/so_called_carb_symptoms.html http://www.model-a.org/fuel_supply_critical.html A Model A carburetors fuel supply must be clean and unrestricted. There are many potential contributors to dirty or restricted fuel. http://www.model-a.org/fuel_supply_critical.html http://www.model-a.org/clean_minor_dirt.html A good cleaning is sometimes all that a carburetor needs to get it running well again. http://www.model-a.org/clean_minor_dirt.html http://www.model-a.org/how_carb_works.html Understanding the theory on how this carburetor functions is very helpful in diagnosing problems. http://www.model-a.org/how_carb_works.html http://www.model-a.org/who_manufactured.html Not only did the carburetor design change often, it was manufactured by three corporations. http://www.model-a.org/who_manufactured.html http://www.model-a.org/model_b_carb.html The Model B carburetor was built for original installation in Ford Model B engines from 1932 through 1934. http://www.model-a.org/model_b_carb.html http://www.model-a.org/filtering_air_into_carb.html Filtering the air going into a Model A carburetor is a controversial subject among Model A mechanics. This information is provided to help people make their own decision. http://www.model-a.org/filtering_air_into_carb.html http://www.model-a.org/zenith_description.html It's tough to describe this carburetor in a few words to a novice, but here is my best shot at it. Hopefully, a couple of pictures really are worth a thousand words. http://www.model-a.org/zenith_description.html http://www.model-a.org/how_carb_evolved.html The carburetor was in production for only about four years, but it's amazing how many little design variations were implemented in that time. http://www.model-a.org/how_carb_evolved.html http://www.model-a.org/more_photo_links.html Since there were quite a few small variations of the Zenith, Model A carburetor, this is a link to a site that has photos of what the carburetors looked like. http://www.model-a.org/more_photo_links.html http://www.model-a.org/general_carb_description.html It's tough to describe this carburetor in a few words to a novice, but here is my best shot at it. Hopefully, a picture really is worth a thousand words. http://www.model-a.org/general_carb_description.html http://www.model-a.org/details_to_look_for.html It's hard to spot a Zenith, Model A carburetor at a Swap Meet if you haven't seen one recently. Continue on with these next few pages for more hints. http://www.model-a.org/details_to_look_for.html http://www.model-a.org/defects_to_look_for.html Not only do you need to recognize a Zenith, Model A carburetor, you need to be able to spot defects that can make one nearly worthless. http://www.model-a.org/defects_to_look_for.html http://www.model-a.org/needs_restoration.html Here are some hints on observations that suggest that a carburetor needs a total restoration, versus some repairs. http://www.model-a.org/needs_restoration.html http://www.model-a.org/restore_cost_drivers.html Here are some hints on observations that may identify things that will degrade the value of an old carburetor. http://www.model-a.org/restore_cost_drivers.html http://www.model-a.org/negotiating_leverage.html Now you should have some idea if an old carburetor is the one you want to buy. But, what is it worth to you? http://www.model-a.org/negotiating_leverage.html http://www.model-a.org/cleaning_carb.html A good cleaning is sometimes all that a carburetor needs to get it running well again. http://www.model-a.org/cleaning_carb.html http://www.model-a.org/purchase_carb.html http://www.model-a.org/purchase_carb.html http://www.model-a.org/trade_in.html http://www.model-a.org/trade_in.html http://www.model-a.org/restored_or_repaired.html http://www.model-a.org/restored_or_repaired.html http://www.model-a.org/special_needs.html http://www.model-a.org/special_needs.html http://www.model-a.org/costs.html http://www.model-a.org/costs.html http://www.model-a.org/delivery.html http://www.model-a.org/delivery.html http://www.model-a.org/transportation.html http://www.model-a.org/transportation.html http://www.model-a.org/starting.html Starting a Model A Ford isn't as simple as in a modern automobile and can be a struggle for a novice. This procedure will help the novice. One must recognize that there were variations in even original Model A Fords. For example, the gas shut off valve was moved from under the dash to under the hood in 1931. http://www.model-a.org/starting.html http://www.model-a.org/shut_down.html Shutting down a Model A Ford isn't as simple as in a modern automobile, and some guidance is helpful. http://www.model-a.org/shut_down.html http://www.model-a.org/idle_adjustment.html There are two external adjustments to be made on the carburetor when it is installed. http://www.model-a.org/idle_adjustment.html http://www.model-a.org/use_carb_check_timing.html Here is one way to check if the engine timing is about where it should be. http://www.model-a.org/use_carb_check_timing.html http://www.model-a.org/adjust_timing.html Here is one way to adjust the engine timing. http://www.model-a.org/adjust_timing.html http://www.model-a.org/remove_carb.html Removing the carburetor is very simple, if you know how to. http://www.model-a.org/remove_carb.html http://www.model-a.org/zenith_disassembly.html Taking the carburetor apart isn't always easy, but here are some pointers. http://www.model-a.org/zenith_disassembly.html http://www.model-a.org/install_heli_coils.html Instructions for installing Heli-Coils are generally on their package, but here is a summary of how to do it. http://www.model-a.org/install_heli_coils.html http://www.model-a.org/lower_carb_assembly.html Assuming that you have closely inspected and cleaned all the components, here are some instructions on how to assemble the lower casting. http://www.model-a.org/lower_carb_assembly.html http://www.model-a.org/upper_carb_assembly.html Assuming that you have closely inspected and cleaned all the components, here are some instructions on how to assemble the upper casting. http://www.model-a.org/upper_carb_assembly.html http://www.model-a.org/installing_carb.html Just because one has removed the carburetor, does not mean that they know everything about installing one. So, here is some important guidance. http://www.model-a.org/installing_carb.html http://www.model-a.org/testing_carb.html After installing a carburetor, it needs to be road tested to check its performance. http://www.model-a.org/testing_carb.html http://www.model-a.org/main_jet.html http://www.model-a.org/main_jet.html http://www.model-a.org/cap_jet.html http://www.model-a.org/cap_jet.html http://www.model-a.org/compensator_jet.html http://www.model-a.org/compensator_jet.html http://www.model-a.org/secondary_well.html http://www.model-a.org/secondary_well.html http://www.model-a.org/idle_jet.html http://www.model-a.org/idle_jet.html http://www.model-a.org/castings.html http://www.model-a.org/castings.html http://www.model-a.org/upper_passages.html http://www.model-a.org/upper_passages.html http://www.model-a.org/lower_passages.html http://www.model-a.org/lower_passages.html http://www.model-a.org/casting_threads.html http://www.model-a.org/casting_threads.html http://www.model-a.org/throttle_assembly.html http://www.model-a.org/throttle_assembly.html http://www.model-a.org/idle_air_valve.html http://www.model-a.org/idle_air_valve.html http://www.model-a.org/gav_seat.html http://www.model-a.org/gav_seat.html http://www.model-a.org/choke_gav_driver.html http://www.model-a.org/choke_gav_driver.html http://www.model-a.org/float_valve_float.html http://www.model-a.org/float_valve_float.html http://www.model-a.org/gaskets.html http://www.model-a.org/gaskets.html http://www.model-a.org/venturi.html http://www.model-a.org/venturi.html http://www.model-a.org/filter_strainer.html http://www.model-a.org/filter_strainer.html http://www.model-a.org/drain_plug.html http://www.model-a.org/drain_plug.html http://www.model-a.org/main_bolt.html http://www.model-a.org/main_bolt.html http://www.model-a.org/choke_driver_wing_nut.html http://www.model-a.org/choke_driver_wing_nut.html http://www.model-a.org/dremel_911.html http://www.model-a.org/dremel_911.html http://www.model-a.org/drilled_nut_driver.html http://www.model-a.org/drilled_nut_driver.html http://www.model-a.org/fiber_optic_light.html http://www.model-a.org/fiber_optic_light.html http://www.model-a.org/float_tester.html http://www.model-a.org/float_tester.html http://www.model-a.org/fuel_sight_tube.html http://www.model-a.org/fuel_sight_tube.html http://www.model-a.org/gav_honing_tool.html http://www.model-a.org/gav_honing_tool.html http://www.model-a.org/gav_wrench.html http://www.model-a.org/gav_wrench.html http://www.model-a.org/heli_coil_repair.html http://www.model-a.org/heli_coil_repair.html http://www.model-a.org/jet_flow_testing.html http://www.model-a.org/jet_flow_testing.html http://www.model-a.org/small_drill_sets.html http://www.model-a.org/small_drill_sets.html http://www.model-a.org/throttle_fixture_plate.html http://www.model-a.org/throttle_fixture_plate.html http://www.model-a.org/venturi_extraction.html http://www.model-a.org/venturi_extraction.html http://www.model-a.org/allstate.html http://www.model-a.org/allstate.html http://www.model-a.org/borg_warner.html http://www.model-a.org/borg_warner.html http://www.model-a.org/carter_manufacturing.html http://www.model-a.org/carter_manufacturing.html http://www.model-a.org/gaz.html http://www.model-a.org/gaz.html http://www.model-a.org/genuine_antique.html http://www.model-a.org/genuine_antique.html http://www.model-a.org/johnson.html http://www.model-a.org/johnson.html http://www.model-a.org/kayce.html http://www.model-a.org/kayce.html http://www.model-a.org/ktk.html http://www.model-a.org/ktk.html http://www.model-a.org/marvel_carb.html http://www.model-a.org/marvel_carb.html http://www.model-a.org/marvel_schebler.html http://www.model-a.org/marvel_schebler.html http://www.model-a.org/mochi.html http://www.model-a.org/mochi.html http://www.model-a.org/motorcraft.html http://www.model-a.org/motorcraft.html http://www.model-a.org/rayfield_rif.html http://www.model-a.org/rayfield_rif.html http://www.model-a.org/sears.html http://www.model-a.org/sears.html http://www.model-a.org/simmons.html http://www.model-a.org/simmons.html http://www.model-a.org/tillotson.html http://www.model-a.org/tillotson.html http://www.model-a.org/tokyo_carb.html http://www.model-a.org/tokyo_carb.html http://www.model-a.org/western_auto.html http://www.model-a.org/western_auto.html http://www.model-a.org/wheeler_schebler.html http://www.model-a.org/wheeler_schebler.html http://www.model-a.org/wizard.html http://www.model-a.org/wizard.html http://www.model-a.org/zenith_models.html http://www.model-a.org/zenith_models.html http://www.model-a.org/judging_standards.html http://www.model-a.org/judging_standards.html http://www.model-a.org/mechanics_handbook.html http://www.model-a.org/mechanics_handbook.html http://www.model-a.org/rex_way.html http://www.model-a.org/rex_way.html http://www.model-a.org/paul_moller_carb.html http://www.model-a.org/paul_moller_carb.html http://www.model-a.org/carb_restore_guide.html http://www.model-a.org/carb_restore_guide.html http://www.model-a.org/carbohydrates.html http://www.model-a.org/carbohydrates.html http://www.model-a.org/mafca.html http://www.model-a.org/mafca.html http://www.model-a.org/mafcc.html http://www.model-a.org/mafcc.html http://www.model-a.org/restores_club.html http://www.model-a.org/restores_club.html http://www.model-a.org/scvc.html http://www.model-a.org/scvc.html http://www.model-a.org/jim_mason.html http://www.model-a.org/jim_mason.html http://www.model-a.org/barnyard.html http://www.model-a.org/barnyard.html http://www.model-a.org/carb_photos.html http://www.model-a.org/carb_photos.html http://www.model-a.org/rebuilding_engine.html http://www.model-a.org/rebuilding_engine.html http://www.model-a.org/testing_engine.html http://www.model-a.org/testing_engine.html http://www.model-a.org/troubleshooting_model_a.html http://www.model-a.org/troubleshooting_model_a.html http://www.model-a.org/mileage_tester.html http://www.model-a.org/mileage_tester.html http://www.model-a.org/mafca_qa.html http://www.model-a.org/mafca_qa.html http://www.model-a.org/ford_forum.html http://www.model-a.org/ford_forum.html http://www.model-a.org/ahooga_mb.html http://www.model-a.org/ahooga_mb.html http://www.model-a.org/fordbarn.html http://www.model-a.org/fordbarn.html http://www.model-a.org/skinned_knuckles.html http://www.model-a.org/skinned_knuckles.html http://www.model-a.org/gas_leaks.html http://www.model-a.org/gas_leaks.html http://www.model-a.org/engine_350_450_rpm.html http://www.model-a.org/engine_350_450_rpm.html http://www.model-a.org/problems_drive_5_35_mph.html http://www.model-a.org/problems_drive_5_35_mph.html http://www.model-a.org/problems_drive_over_30_mph.html http://www.model-a.org/problems_drive_over_30_mph.html http://www.model-a.org/engine_dies_stop.html http://www.model-a.org/engine_dies_stop.html http://www.model-a.org/mileage_sooty_rich_smell.html http://www.model-a.org/mileage_sooty_rich_smell.html http://www.model-a.org/mixture_lean_heat.html http://www.model-a.org/mixture_lean_heat.html http://www.model-a.org/back_fires.html http://www.model-a.org/back_fires.html http://www.model-a.org/miss_jerks.html http://www.model-a.org/miss_jerks.html http://www.model-a.org/gav_not_extra_fuel.html http://www.model-a.org/gav_not_extra_fuel.html http://www.model-a.org/loose.html http://www.model-a.org/loose.html http://www.model-a.org/float_too_high.html http://www.model-a.org/float_too_high.html http://www.model-a.org/float_valve_not_seat.html http://www.model-a.org/float_valve_not_seat.html http://www.model-a.org/gasket_not_sealing.html http://www.model-a.org/gasket_not_sealing.html http://www.model-a.org/gasket_too_thick.html http://www.model-a.org/gasket_too_thick.html http://www.model-a.org/jet_tips_not_dished.html http://www.model-a.org/jet_tips_not_dished.html http://www.model-a.org/vacuum_leaks.html http://www.model-a.org/vacuum_leaks.html http://www.model-a.org/throttle_idle_screw_misadjusted.html http://www.model-a.org/throttle_idle_screw_misadjusted.html http://www.model-a.org/idle_air_screw_misadjusted.html http://www.model-a.org/idle_air_screw_misadjusted.html http://www.model-a.org/upper_idle_jet_passage.html http://www.model-a.org/upper_idle_jet_passage.html http://www.model-a.org/upper_air_adjust_passage.html http://www.model-a.org/upper_air_adjust_passage.html http://www.model-a.org/idle_jet_dirt.html http://www.model-a.org/idle_jet_dirt.html http://www.model-a.org/idle_jet_large.html http://www.model-a.org/idle_jet_large.html http://www.model-a.org/gav_open.html http://www.model-a.org/gav_open.html http://www.model-a.org/gav_seat_missing.html http://www.model-a.org/gav_seat_missing.html http://www.model-a.org/lower_bowl_passage_restricted.html http://www.model-a.org/lower_bowl_passage_restricted.html http://www.model-a.org/lower_jet_passage_restricted.html http://www.model-a.org/lower_jet_passage_restricted.html http://www.model-a.org/comp_jet_dirt.html http://www.model-a.org/comp_jet_dirt.html http://www.model-a.org/comp_jet_large.html http://www.model-a.org/comp_jet_large.html http://www.model-a.org/float_too_low.html http://www.model-a.org/float_too_low.html http://www.model-a.org/lower_bowl_passage_restricted_main.html http://www.model-a.org/lower_bowl_passage_restricted_main.html http://www.model-a.org/main_jet_dirt.html http://www.model-a.org/main_jet_dirt.html http://www.model-a.org/upper_fuel_line_restricted.html http://www.model-a.org/upper_fuel_line_restricted.html http://www.model-a.org/gav_seat_blocked.html http://www.model-a.org/gav_seat_blocked.html http://www.model-a.org/air_filter_restricted.html http://www.model-a.org/air_filter_restricted.html http://www.model-a.org/privacy.html The Privacy Statement and Policy for Model-A.org. http://www.model-a.org/privacy.html http://www.model-a.org/terms.html The Terms of Service for Model-A.org. http://www.model-a.org/terms.html http://www.model-a.org/sitemap.html The complete site map for Model-A.org. http://www.model-a.org/sitemap.html http://www.model-a.org/index.html The site index for Model-A.org. http://www.model-a.org/index.html http://www.model-a.org/carb_removal_disassembly.html Taking the carburetor out and taking it completely apart is easier with some guidance. http://www.model-a.org/carb_removal_disassembly.html http://www.model-a.org/2002_seminar.html Chris conducts class at his 2002 Zenith Seminar. http://www.model-a.org/2002_seminar.html http://www.model-a.org/more_info.html This More Information area contains valuable information that does not fit very well into the other top level areas of the website. http://www.model-a.org/more_info.html http://www.model-a.org/seminars.html As I teach seminars and write articles on the Zenith, Model A Ford carburetor, information about them will appear here. http://www.model-a.org/seminars.html http://www.model-a.org/brass_passage_plugs.html To properly clean out passages, the brass plugs must be removed and replaced. http://www.model-a.org/brass_passage_plugs.html http://www.model-a.org/repairing_casting_holes.html Occasionally, the tapped holes for jets (in the castings) are damaged to the point they must be repaired. http://www.model-a.org/repairing_casting_holes.html