A gentleman’s classic Ferrari 250 BOANO is undergoing a full restoration.
In the plethora of things to do, the customer has asked us to take on the restoration of the carburettors.
3x of them..
WEBER TIPO 36 DCZ/3 (a.k.a DCL/3) original standard Italian factory Items.. about 60 years old!
Unfortunately, someone in that time – with a pretty heavy hand – had a go at the carburettors and broke one of the pump-rods, and replaced a brass float with a heavier one, which means the affected carburettor would be running richer than the other two.
Anyway, thankfully apart from that, the carburettors were in good order perfectly restorable!
Restoration took around 6x weeks – Quite of a lot of running around sourcing obsolete parts (broken enrichment/cold start alloy casting bracket) machining parts that were missing and no longer available and so on..
Here are the carburettors as we received them:
Auxiliary venturis had been overtightened and no-longer a ’round’… but sort of oval 🙁
1x pump rod was damaged
1x float was incorrect
1x idle speed screw, spring & brass cupped washer were missing (no longer available)
2of3 I.D. Tags missing
All throttle valve screws had been brazed to the spindle and had to have the brazing removed before attempting to remove. A very delicate procedure that if goes wrong, can be quite costly!
Cold start lever support bracket (cast alloy) had a screw boss snap-off! Thankfully a replacement was sourced and the bracket was repaired..
And below in the strip-down and inspction process:
The carburettors were stripped down and parts separated in their allocated containers.
Brass for chemical cleaning and buffing (light polish)
Steel parts for yellow zinc passivated plating
Pump rods & springs for chemical Blacking (black phosphate)
Alloy cast parts including chokes & venturis for vapour blasting
Here are the parts after treatments completed:
After the parts have been treated , they are inspected and given a final clean before assembly can begin.
The cast alloy bodies have all their screw holes and emulsion/fuel/air passages cleaned with compressed air to ensure all passages are clear and flow as they should.
After parts have been inspected & cleaned, a final evaluation is made to count all the parts and source any parts that will require replacing and/or repair.
Then assembly can begin:
And that is a WEBER 36 DCZ/3 Triple 1957 Ferrari 250 BOANO Carburettor restoration complete!!
These are ready to sit on the 3.0ltr V12 engine
Had our fair share of challenges with these – However when working on pieces that are 60+ years old, un-expected challenges can be expected!! 🙂
Have a look at some of our other Carburettor Restorations here:
Hope you enjoyed having a look at our restoration!
Ciao for now,