Process of Restoration:

The carburettors are visually inspected for any damage to the castings.
A damaged casting could mean that the affected carburettor(s) is unsuitable for restoration and therefore scrapped (if a carburettor is irreplaceable, specialised welding and machining can be used to repair it).

Thankfully, these carburettors were partially seized, but structurally sound.
Once inspection is complete, and carburettors are found to be suitable for restoration, the dismantling process begins.

Because these Italian carburettors are original and obsolete, great care is taken to ensure each part is removed carefully, individually stored, and and packed together with it’s counterpart, through the treatment process, and then – when time comes for rebuilding – reunited with it’s original carburettor under original specifications.

Carburettor bodies and top covers are marked with a punch tool before dismantling, so that they are reunited after the vapour blasting and compressed air cleaning process.
Furthermore it is important to return them in exactly the same order they were removed from their engine..  ..but in beautiful, pristine condition and good for another 40 years or so!

As disassembly proceeds, written notes are made, photos of small parts are taken and kept on record and a compartmentalised disassembly approach, ensures each part is examined individually and kept together in a methodical fashion.

Slow but steady!


Restoration/Refurbishment/Service Process for Triple Ferrari DINO 246 WEBER 40 DCNF 13 Carburettors

Triple WEBER 40 DCNF 13 before restoration

Restoration/Refurbishment/Service Process for Triple Ferrari DINO 246 WEBER 40 DCNF 13 Carburettors

Triple WEBER 40 DCNF 13 before restoration


Triple WEBER 40 DCNF 13 before restoration

Restoration/Refurbishment/Service Process for Triple Ferrari DINO 246 WEBER 40 DCNF 13 Carburettors

Triple WEBER 40 DCNF 13 before restoration

















Great care must me taken when trying to unscrew fasteners since these have been untouched for around 40 years and can brake with too much force or heavy-handedness

This is were patience, experience and suitable tools are necessary!

The areas that are particularly troublesome are the throttle valve screws and spindles, Top cover float fulcrum pins and starter jets.

The throttle valve screws have been punch-secured after fitted by the factory, to prevent them coming loose and falling into the engine. Add to this that they might have suffered some corrosion over the years and you realise how easy it is to damage the carburettor spindle when trying to remove the throttle valve screws. Too much heavy-handedness here can cause the spindle to bend and warp.

The starter jet assemblies can be difficult to remove because they tend to get seized over time and they are made out of soft brass. Not a good combination for the Hammer!





3x punch marks on 40 DCNF 13 Top Cover – Marked before dis-assembly so as to re-unite to correct carburettor body. Good tip if working with multiple carburettor sets (Such as the triple Ferrari DINO 246 Set)


i.d. tag showing the carburettor’s origin ‘FERRARI’ This will get Acid Cleaned and Nickel Plated to make it good for another 40 years














Dismantling carburettors and taking note of jet sizes and condition of brass/alloys


Taking take to take into account all seals, washers, and spacers when removing jets and calibrated parts.













Throttle valve spindle and pump cam removal.


Throttle Spindle Thrust side Components during dis-assembly













Spindle & spindle bearing removal


Bearing shield/cover and spacer











Spindle removal process


Triple 40 DCNF 13 spindle & bearing layout











Pump cam lever pin removal


choke venturi removal through the top of the carburettor bore












Throttle Valve Spindle & bearing breakdown


Pump cam lever pin removal









When all parts have been removed from the bodies and top covers:

The cold-start mechanisms and pump housings are dismantled.

The aluminium, brass, steel are separated. The steel separated into 2x containers as some of it will go through a chemical Blacking/Phosphate coating and the rest will go through acid cleaning and zinc-plating.

The brass is sent out to be chemically cleaned and then is returned to us for further polishing.

The aluminium bodies, top covers, pump housings and cold-start mechanisms go through a vapour blasting process (mixture of water and glass bead) and then washed is soft detergent by hand before blowing the dry using high-speed compressed air.

Genuine WEBER service kits with correctly sized needle valves are used to seal the gaps in this little beauties.





Triple WEBER 40 DCNF 13 Dis-assembly complete


Parts breakdown ready for various treatments






separating alloy from brass and steel (see how a wire loop keeps all parts together ready for vapour blasting)


Steel. All steel parts including throttle levers, fuel unions, nuts, screws and washers ready for acid cleaning and re-zinc plating














Parts that are left over after separation. The bearings will either be cleaned in a solvent and re-greased or new ones will replace them.


chokes, venturis, top covers, and bodies loomed together to maintain order












All brass, including the fuel floats ready for chemical cleaning process


More steel parts. Only these will go through cleaning and then re-coating with phosphate (a.k.a. chemical blacking)











Over the next few days, these processes will be completed and the parts will be ready to inspect.
A few of the venturis will most likely require replacing as will the idle mixture screws.



Processing & Reassembly:




Carburettor bodies, top covers, chokes & auxiliary venturis after vapour blasting


After vapour blasting, the carburettors are blown-through with compressed air to remove all vapour blsting debris from all orifices












Using compressed air to remove any debris left over from vapour-blasting


A long, thin nozzle is ideal for getting into the narrow passages











Throttle shafts & return springs after phosphate coating


Fuel Unions, throttle levers etc.. after yellow zinc plating













Brass Fuel Floats, Throttle valves, fuel filter plugs etc.. after cleaning


Fuel float before and after cleaning Note: There is no polishing here, just cleaning













After vapour blasting this cold start mechanism has it’s fine brass wire mesh re-fitted


It’s a case of gently sliding it in… Care must be taken as it is delicate











Cold start mechanism gear cogs aligned – See markings


Wire mesh inserted… Done!






















Adjusting fuel Float height & movement


Adjusting fuel float height & movement










New top cover gaskets ready to fit


Pump, seals & gasket replacements on the ready..












New spindle ball bearings ready to be fitted


Throttle shaft slides into position











Spindle and bearing are together..


Spindle bearing cover and spacer are installed.











And here they are completed and ready to install on the engine.
They are set-up with manufacturers specification settings.

Once started on engine, the process of fine-tuning – to get the very best out of them – begins!!


If you want to get started on yours, here are the service kits available to buy in our shop:











Triple WEBER 40 DCNF 13 Carburettors opened-up


WEBER Triple 40 DCNF 13 Carbs with tops removed.










WEBER 40 DCNF 13 Triple Set for Ferrari 246 DINO V6 engine. Restoration Complete.


WEBER 40 DCNF 13 Triple Set for Ferrari 246 DINO V6 engine. Restoration Complete.If you’d like to contact us about a similar Carburettor Restoration:

Contact us regarding a similar Carburettor Restoration:

Please contact us at: [email protected]

…or visit our ‘contact’ page.

Here are links to some other carburettor restorations:
Triple WEBER 40 DCZ/6 Carburettor Restoration Classic Ferrari 250/275/330
Triple choke WEBER 40 IDAP3C Carburettors – Porsche 911


Thank you for looking,


Emmanuel Grigoriou