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!
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!
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.
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:
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:
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,