Gege Blog 8.1 Overhaul of A carburettor (f) .pdf



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Gege Blog English –

8.1 – Overhaul of “A” Carburettor - Révision du carburateur "A"
Sunday 3 February 2013

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This Solex 26 AHD carburettor is apparently not the original setup, but a period adaptation, of which I have the
documentation. It strongly resembles the 30DHT of my Traction Avant 1938 ...

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At first glance, it seems to be in pretty good condition, although a bit dirty. The tank plates well on the lid, the flange does not
seem deformed, only the throttle lever is bent, but it can be straightened easily

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Step one, cleaning with gasoline:

:

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I dismantle the "air bell", and the throttle lever

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Unscrewing the cap nut of the throttle shaft and removing the idler linkage

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Unscrew the tank screws, you will have to replace the old countersunk screw with a new one

Removal of the float chamber

… and float 26 g

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Removal of choke fuel jet Gs (120)

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and main fuel jet Gg (85)

Removal of idle fuel jet g (045)

Remove the screw of the banjo coupling with its filter,

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and remove the needle p (2)

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Finished for the float chamber.

Separation of float chamber cover and housing (one screw is missing and has to be replaced):

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Removal of the idle air jet

Removal of the automatic jet a (220) ,)… removal of the emulsion tube underneath

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…... Removal of the 26 jet

Finished for the lid

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Finishing with the body…. Removal of the choke lever nut L1 … the washer

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Removing the Ga choke air jet (3.5)

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… and the choke lever

Unscrewing the idle richness screw W while counting the number of revolutions(5.5)

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Removal of the choke cover held by 4 brass screws

Removal of the choke disc
.

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It is a bistarter version , with a ball pushed by a spring… fits alternatively into two notches in a bakelite washer in order to
maintain the choke in one of the two positions .

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The cover is empty:.

Removal of the choke cable support

And it is finished. I didn't remove the throttle shaft, the shaft has almost no play

Small passage in the dishwasher of the “Zamak” alloy bits, we'll see the result?

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And while the dishwasher is running, the steel elements are being tortured in HCl, the brass ones in a powerful cleaner

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Monday, February 4th, 2013

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Two runs in the dishwasher were not terribly conclusive ...

On the other hand, I cleaned the brass parts (except the float which was clean) with nylon brushes of various shapes, mounted
on a drill, and it worked well.
List of the 26 AHD jets with their characteristics for a C3 :

After having bathed in diluted hydrochloric acid HCL ("spirit of salt") for 2 hours, the steel parts spent the night in diluted
sodium hydroxide NaOH ("caustic soda") to neutralise them. I remind that it is dangerous, and that it is necessary to protect
your eyes (and hands ...). But it's really efficient, not a trace of rust, and it's not tiring !!

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Then, I brushed them with a nylon brush on a drill,

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…as well as all the Zamak parts, and here is the result : top: Zamak, middle: the steel, bottom : the brass. Everything is
disassembled, except the butterfly and its shaft, the screws were too strong (I was afraid to damage them !) and anyway the
shaft is not very worn ...

...
… a nice collection of parts:
I made a very light passage of the tank, its lid and flange on a marble covered with emery paper, there was no perceptible
deformation. I then blew (well, rather my compressor!) with 8 bars in all the ducts and jets.
Reassembly is done in the reverse order of disassembly, or any other way if you want to waste time.

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But as every rule has its exceptions, it's better not to reassemble the choke mechanism like this, by first placing the cable
support (with its lock nut here) :

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because afterwards, very difficult to put the bakelite washer back in place while pushing the ball back into its housing !.

Luckily, Mr Solex thought of everything and under the choke cable support there is a hole.

Just put the choke disc in its block

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,
then only close with the cable holder held by two small screw

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, and then put the ball (yes, first the ball, I know ...) and the spring

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We then present everything on the body (and in the right direction!)

And fix it with the 4 brass screws

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Then presentation of the choke lever with its nut blocking the cable, we make sure that it turns well and stops well in the
notches (bistarter),

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, The washer and nut are placed on top

and tightened securely.

I put back the idle richness screw

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that I tighten by 5.5 turns as when disassembling.

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.

. tightened..

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Installation of the air jet of starter Ga,

That's it for the body
.

Moving on to the lid. Presentation of the 26 jet

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with its most rounded side and the engravings outwards

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Introduction of the emulsion tube

which is clamped in place. Thus the jet is maintained

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… tightened

… tightened

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Installing the small idle air jet,

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Installation of the automatic jet

I could have finished the cover by putting immediately the needle and the fuel inlet (it would have been more logical and
didactic!), but I first present it on the body

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It's starting to look like a carburettor

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and I fix it by the 3 screws (the fourth one will soon be manufactured in Italy, a strange pitch for a 5mm diameter thread - 4.85
exactly -, shorter than the standard 0.80.). After "deep" analysis with Michel on Skype, it turns out that it is 5mm to 0.75
pitch, which is in principle the pitch of 4.5. The brass screws of the choke cover are in 4 mm with a 0.75 pitch, which is not
standard either !...)

It's starting to look like a carburettor

the needle valve installed

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… tightened

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…and the fuel inlet with the gaskets, the filter and the banjo fitting.

Then the float chamber:
The inscription 26 AHD and the serial number 3544165

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…. tightening

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Installation of the idle fuel jet g

… tightening .

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Installing the choke fuel jet Gs ,

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Installing main fuel jet Gg,

tightening .

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Assembling the tank and cover, and the float (!)

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The ugly screw will be remade in Italy (thanks in advance Michel !)

It remains to reassemble all the mechanism that operates the butterfly valve : .
:

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Installation of the idle adjustment screw, I had counted 6 turns at disassembly, and installation of the stop screw that adjusts
the throttle fully open. I had thought of making a joke to André by adjusting it so that he doesn't go too fast, but with his C3
he won't risk his licence!

… the control on the shaft (why make it simple when you can make it complicated?).

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…, the lever on the bracket,

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Putting the ball joint on the bracket…

Presentation of all this stuff on the carburettor

… and tightening of the cap nut on the throttle shaft

... and you're done:

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Tightening of the air bell on the carburettor

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The bracket with the ball joint is fixed by one of the screws of the air bell, it turns on a small bush ..

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Some pictures for the pleasure of the eyes:

Friday February 15, 2013
I received Michel's screws, they are perfect (as usual!) ...

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For the carburettor tank, the old ones and the new ones :

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For the body, he made 4 of them and I'm replacing them all. The 5th is an old one, and the new ones are really identical, with
their 0.75 pitch for screws of 5 (which should have a 0.8 pitch !) .

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.. . The old ones and a new one :

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And it's finished !

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THE END


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