Zenith Workshop Manual Pages

Zenith 32 NDIX workshop manual pages for Porsche 356 carburetor reference.

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Current service status

Zenith restoration is now referred to Nick Warriner.

356 Carburetor Rescue no longer restores Zenith carburetors. Nick Warriner of 356 Racing has taken over this work independently; contact details are on the Zenith hub page.

Zenith Workshop Manual Pages

About your Porsche Fuel System - Zeniths

These are copies of pages from a Porsche Workshop Manual Supplement for Zenith carburetors. This information applies to all Porsches using the Zenith 32 NDIX carburetor. If you don't have a copy of the manual you will find this information helpful when installing, tuning, or trouble-shooting your carbs.

There are a number of other issues to consider before having your carburetors restored: Do you have a fuel filter? The "stuff" from the bottom of your old gas tank may be clogging passageways or jets, resulting in intermittent performance. And that will continue with your restored carbs! Check your fuel pump pressure. This is particularly important with the Zeniths VERY IMPORTANT, check your distributor! Timing, most importantly, consistency of timing, to making sure your engine is performing correctly. Petronix is not a help with a six volt system, but may improver your timing in a 12 volt system. linkage connected properly, from the fuel pedal to the carburetor. Valves, rockers, pistons, all functioning well

Click on the specific page for an enlargement. You can always print the page out if you need to.

Do you have the right carburetor set up for your engine? check these specifications to find out what is correct for your original engine.

"Exploded" parts diagrams of the carburetors are available here, so you can see what parts may, or may not, be missing, need to be replaced, or are broken. Those diagrams will also help you in ordering parts if you want to repair or rebuild your carburetors yourself. Most of all, these diagrams are essential in making sure all parts are re-installed in the correct order.

Suggested tools -

The Porsche manual suggests the Unisyn tool. Many owners find the Synchrometer easier to use - Stoddard, as well as other Porsche parts suppliers offer the Synchrometer

Trouble-shooting the fuel pump

Work-shop manual: Fuel Pump pages

Adjustment data

Removing and installing

troubleshooting your carburetors

Click any page to enlarge

Zenith 32 NDIX workshop manual page F3 — Description of the Dual Downdraft Carburetor, with a labeled line drawing of the carburetor with cover removed (Fig. 1)
Zenith 32 NDIX workshop manual page F4 — text on the carburetor cover, float system and idling circuit with a cutaway diagram of the float system (Fig. 2)
Zenith 32 NDIX workshop manual page F5 — two cutaway diagrams of the idling circuit showing operation at idling speed and during transit (Figs. 3 and 4)
Zenith 32 NDIX workshop manual page F6 — text on main carburation with a cutaway diagram of the mixing chamber at full throttle (Fig. 5)
Zenith 32 NDIX workshop manual page F7 — Accelerator Pump section with a labeled cutaway diagram of the accelerator pump (Fig. 6)
Zenith 32 NDIX workshop manual page — exploded and assembled photographs of the dual downdraft carburetor with a numbered parts key (Fig. 7)
Zenith 32 NDIX workshop manual page F9 — Carburetor Adjustment Data specifications table comparing 1600 and 1600 S engine settings
Zenith 32 NDIX workshop manual page F11 — Removing and Installing Carburetor instructions with three engine-bay photographs (Figs. 10, 11, 12)
Zenith 32 NDIX workshop manual page F12 — Cleaning and Disassembling the carburetor instructions with two photographs (Figs. 13 and 14)
Zenith 32 NDIX workshop manual page F13 — disassembly and inspection instructions with three carburetor photographs (Figs. 15, 16, 17)
Zenith 32 NDIX workshop manual page F14 — inspection and Idling Adjustment instructions with a photograph of the synchronizing unit in use (Fig. 18)
Zenith 32 NDIX workshop manual page F15 — idling adjustment and injection-ratio instructions with a photograph of the synchronizing unit on the engine (Fig. 19)
Zenith 32 NDIX workshop manual page F16 — adjusting injection ratio and checking fuel level instructions with two carburetor photographs (Figs. 20 and 21)
Zenith 32 NDIX workshop manual page F17 — Checking Float and Checking Throttle Valve Assembly instructions with photographs (Figs. 22, 23, 24)
Zenith 32 NDIX workshop manual page F18 — throttle valve, Cleaning Air Filter and Replacing Micronic Elements instructions with photographs (Figs. 25, 26, 27)
Zenith 32 NDIX workshop manual page F19 — Removing and Installing Intake Manifold and Accelerator Linkage instructions with an engine-bay photograph (Fig. 28)
Zenith 32 NDIX workshop manual page F20 — Adjusting Carburetor Linkage text instructions with a caution note
Zenith 32 NDIX workshop manual page F21 — Carburetor Troubles and their Cure table listing trouble, cause and remedy
Zenith 32 NDIX workshop manual page F23 — Fuel Pump description with a labeled cutaway diagram of the fuel pump and a numbered parts key (Fig. 29)
Zenith 32 NDIX workshop manual page F24 — Fuel Pump Components exploded diagrams with numbered parts keys (Figs. 30 and 31)
Zenith 32 NDIX workshop manual page F25 — Checking Pump Pressure and Removing/Installing Fuel Pump instructions with a fuel pump photograph (Fig. 32)
Zenith 32 NDIX workshop manual page — fuel pump installation and Reconditioning Fuel Pump instructions with photographs (Figs. 33, 34, 35)
Zenith 32 NDIX workshop manual page F27 — fuel pump disassembly and assembly instructions with two photographs (Figs. 36 and 37)
Zenith 32 NDIX workshop manual page F28 — fuel pump grease lubrication note with a photograph of the pump flange (Fig. 38)
Zenith 32 NDIX workshop manual page F29 — Fuel Pump Troubles and Their Cure table listing trouble, cause and remedy
Zenith 32 NDIX workshop manual page F35 — special tool reference cards for the P 23 Carburetor Wrench and P 25a Measuring Glass with application and tool photographs
Zenith 32 NDIX workshop manual page F36 — special tool reference cards for the P 75 Carburetor Synchronizing Unit and P 76 Carburetor Wrench 5.5 mm with application and tool photographs
Zenith 32 NDIX workshop manual page F37 — special tool reference card for the P 77 Fuel Level Measuring Glass with application and tool photographs

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32 NDIX Restoration Reference

Historical Zenith 32 NDIX details — finishes, body markings, and restoration notes.

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Pricing Reference

Zenith 32 NDIX reference. Zenith work is now handled by Nick Warriner of 356 Racing.

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Installation Instructions

Step-by-step Zenith 32 NDIX installation guidance.

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Float Level

How to set the Zenith 32 NDIX float level.

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VW Specs

32 NDIX specification notes for Volkswagen applications.

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Test Stand

Notes and images on the Zenith test-stand setup.

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