Solex carby threads

[Defender Mike]

Here is a curly one for the serious series one master! Who knows what type of thread is used in the solex carby's bolts. No guessing its not whitworth, metric or any known gas type thread. I don't know and neither does my mate Graeme who has rebuilt several Series 1s and carbys. We think it may be some type of French gas thread. We cant get a tap or die to suit although some are very close. Anyone who can answer this correctly is entitled to a free beer from me next time I am in your town. LOL:)

[JDNSW]

I don't know, but I would guess probably BA.

John

[back_in]

a little idea that works
if the thread is stripped on any of the 4 bolts holding the pump block on
very carefully drill 2 or so m.m. into the counter sunk in the out side block.
you will pick up the thread it is tapped well passed the bolt thread lenght
the thread I beleive is BA
cheers
Ian

[Defender Mike]

Well I ran the ba theory past my mate and its close but definitely not ba he has ba taps & dies and they bind up and take off metal. Its a mystery and we would love to get the correct tap and die set. The free beer is still open !
Mike:)

[Dinty]

I also thought the screws were 3BA, I miked them this morning and they are way under the given size for 3BA, cheers Dennis:angel:

[wrinklearthur]

I have put this diagram up before from another site, but does show all the parts.

Are the screws you require, shown as three of item number 1?
I have matched these screws from some of my old radio junk.

https://www.aulro.com/afvb/images/imported/2013/11/1306.jpg

Parts supplied may not always conform exactly to illustration
Enquiry Form

Illus Description
No

1 Float chamber cover screw x3
2 Washer x3
3 Choke tube
4 Correction jet
5 Emulsion tube
6 Pilot air bleed
7 Air jet
8 Fibre washer
9 Petrol jet
10 Starter assembly (10-15,17-20)
11 Starter body
12 Starter lever
13 Starter cable locking screw
14 Distance washer
15 Nut
16 Starter fixing screw
17 Starter cable casing locking screw 61 Spindle fibre washer
18 Starter valve locating ball 62 Spindle
19 Retaining plug 63 Mechanical pump return spring
20 Spring 64 Mechanical pump body
21 Choke tube fixing screw 65 Depression pump return spring
22 Pilot jet 66 Depression pump assembly
23 Pump jet 67 Membrane spindle nut
24 Pump non-return valve gauze 68 Membrane spindle
25 Pump non-return valve 69 Depression economy valve
26 Throttle chamber gasket 70 Depression pump body
27 Throttle 71 Gasket
28 Throttle stop screw 72 Economy jet
29 Throttle stop screw lock nut 73 Floatchamber
30 Throttle spindle tab washer 74 Pump injector assembly gasket
31 Throttle lever 75 Pump injector assembly
32 Throttle abutment plate 76 Pump injector assembly screw
33 Spring for 34 77 Float
34 Slow running adjustment screw 78 Float toggle spindle
35 Throttle disc screw x2 79 Float toggle
36 Throttle spindle 80 Needle valve
37 Flange gasket 81 Needle valve washer
38 Throttle body fixing screw washer x4 82 Floatchamber cover gasket
39 Throttle body 83 Floatchamber cover
40 Pump control rod washer 84 Banjo union washer
41 Split pin 85 Banjo union
42 Pump control rod 86 Filter gauze
43 Ignition union olive 87 Banjo bolt washer
44 Volume control screw 88 Banjo bolt
45 Ignition union
46 Pump control rod spring
47 Pump control rod spherical washer
48 Pump intermediate lever
49 Main jet holder washer
50 Main jet
51 Main jet holder
52 Pump fixing screw
53 Pump assembly (54-70)
54 Screw
55 Cover
56 Membrane assembly (57-62)
57 spindle nut
58 Support plate (outer)
59 Support plate
60 Pump membrane
61 Spindle fibre washer
62 Spindle
63 Mechanical pump return spring
64 Mechanical pump body
65 Depression pump return spring
66 Depression pump assembly
67 Membrane spindle nut
68 Membrane spindle
69 Depression economy valve
70 Depression pump body
71 Gasket
72 Economy jet
73 Floatchamber
74 Pump injector assembly gasket
75 Pump injector assembly
76 Pump injector assembly screw
77 Float
78 Float toggle spindle
79 Float toggle
80 Needle valve
81 Needle valve washer
82 Float chamber cover gasket
83 Float chamber cover
84 Banjo union washer
85 Banjo union
86 Filter gauze
87 Banjo bolt washer
88 Banjo bolt

Most parts are available separately. Repair kits, service kits and gasket packs are also available, please state carburettor reference number (stamped on floatchamber cover) or make and model of car, any questions please contact us at.

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e-mail :sales@gowerandlee.co.uk

Tel/Fax +44 (0)1923 247300
.

[wrinklearthur]

Ref; FOR PORSCHE: 61610093400, 616 100 934 00 - READY TO SHIP - (SCREW FOR SOLEX 32 PBI) (http://www.autoatlanta.com/Porsche-Screw-For-Solex-32-Pbi-Parts-PN-R61610093400.html)


SCREW FOR SOLEX 32 PBI
R61610093400 - Replacement/Accessory

https://www.aulro.com/afvb/images/imported/2013/11/1305.jpg

.
Price: $1.64
Description
Number 82 in drawing.


Fits (Click to view section):
356 1950-59
356 1960-64


Notes:
356 1950-64 with Solex 32 Carburetors

Exploded Diagrams (Click to view additional fitment info)
356 1950-59 - Engine
356 1950-59 - Engine
356 1960-65 - Engine
911 1965-69 - Engine
911 1965-69 - Engine
912 1965-69 - Engine
912 1965-69 - Engine

[wrinklearthur]

http://oacdp.org/pdfs/solex.pdf
.

[101 Ron]

I think you will find threads are UNF..........but in smaller sizes they are expressed as 10-28 ......10- 24 .......8-24 or similar.
I do know if you find a LPG repairer they will have spare new screws left over from American Impco and century brand gas convertor overhaul kits and those screws tend to fit the top of many carbies.
I do mobile plant repairs on site and tend to find my carby screws etc from old gas convertors sitting around the workshop.
Taps can be purchased for the smaller UNF/UNC system threads

[B.S.F.]

The ones on my Solex 32PBI S1, and 40PAIO S2 are off the shelf M6x1 (6mm/1mm pitch). .W.

[wrinklearthur]

Ref; Metrics in Engineering - ISO Metric Threads and Tapping Sizes (http://www.metrication.com/engineering/threads.html)

Have a look at the variants in the list in the above link.
.

[JDNSW]

The ones on my Solex 32PBI S1, and 40PAIO S2 are off the shelf M6x1 (6mm/1mm pitch). .W.

It seems highly improbable that an ISO thread would be used on a carburetter designed in Britain in the 1940s. I suggest that they are probably 0BA, and note the following from Wikipedia:-

"The angle of the thread is 47.5 degrees which is different from that used by Whitworth (55 degrees) and ISO Metric (60 degrees) so BA fasteners are never interchangeable with Whitworth/Metric ones even when the pitch and diameter seem similar (e.g. 0BA which appears similar to M6x1m)"

John

[B.S.F.]

According to my book "British Solex Carburetters" the original Solex carburetters were manufacturesd by Solex ,a french company owned by a Maurice Goudard, in 1913. What threads would they have used? The Brits bought the rights to manufacture the carburetters in1914 .W.

[Defender Mike]

You all get free beers !!;) Next time i'm in your town ( could be soon heading to Brisvegas for Chrissy)

There is a vast amount of knowledge to be tapped on this site. I will run through these posts with my friend Graeme and see if he has tried all the options mentioned above.,
Mike :)

[Baggy]

Looks like the same screw on my CD175 carbies on my RRC

Southside Carbies in Mallard Way Cannington WA rebuild Solex carbies from memory and maybe able to advise thread type.

Maybe worth a phone call.....you can only ask Ph: 9350 6677

Cheers

Baggy

[JDNSW]

According to my book "British Solex Carburetters" the original Solex carburetters were manufacturesd by Solex ,a french company owned by a Maurice Goudard, in 1913. What threads would they have used? The Brits bought the rights to manufacture the carburetters in1914 .W.

I was not aware that Solex was originally French. This makes it possible that by the 1940s they were still using French threads, but I think this unlikely. In the 6mm size quoted this has the same pitch (1mm) as ISO and 0BA, and the same thread form as ISO, but smaller diameters differ from ISO.

John

[wrinklearthur]

Ref; Carburetors Page 1 (http://www.dingocroft.co.uk/acatalog/Carburetors.html)

Reproduction Solex 32PBI-2 Carburrettor Ref: 264664D
Application: Series 1 and Series 2 with 2 litre petrol (gasolene) engine. 1954 to 1960 approx.

http://www.dingocroft.co.uk/acatalog/264664.JPG I have found the tops are completely interchangeable, you can keep the Solex lettering and the original fuel line arrangement that way.

Description: Reproduction Solex 32PBI-2 carburrettor. View of base of carb.

http://www.dingocroft.co.uk/acatalog/264664a.JPG

Rebuild kit for Solex 32PBI-2 Carburettor Ref: 266693
Application: Series 1 2.0litre engine 1952 to 1958 fitted with Solex 32PBI-2 carburettor. Zenith part number ZRK17.
Description: A fairly comprehensive kit of parts to rebuild this carburettor.

https://www.aulro.com/afvb/images/imported/2013/11/1267.jpg

Gasket Set for Solex 32PBI-2 Carburettor Ref: 274895
Application: Series 1 2.0litre engine 1952 to 1958 fitted with Solex 32PBI-2 carburettor.
Description: Set of 6 gaskets and 8 fibre washers for this carburettor

https://www.aulro.com/afvb/images/imported/2013/11/1268.jpg

Float for Solex 32PBI Ref: 260745
Application: Series 1 1600cc & 2.0ltr petrol (gasolene).
Description: Brass float for this carburetor.

https://www.aulro.com/afvb/images/imported/2013/11/1269.jpg

This is from only one UK supplier and there are others in UK and Australia, just watch their prices as some are a bit over the top.
.

[chazza]

...Solex ,a french company owned by a Maurice Goudard, in 1913. What threads would they have used?

The French had been metricated since Napolean's time, but when metric threads first appeared I don't know - but I do know that a colleague who restored a 1905? Renault car, told me that a brand new metric nut purchased in 1978 fitted perfectly onto the axle, indicating how well things had been made to a standard over the years. :D

It would not surprise me at all if the Solex has metric threads, given its origin - stranger things have happened; such as Morris manufacturing whitworth-headed bolts with metric threads on them!

Cheers Charlie

[JDNSW]

The French had been metricated since Napolean's time, but when metric threads first appeared I don't know - but I do know that a colleague who restored a 1905? Renault car, told me that a brand new metric nut purchased in 1978 fitted perfectly onto the axle, indicating how well things had been made to a standard over the years. :D

It would not surprise me at all if the Solex has metric threads, given its origin - stranger things have happened; such as Morris manufacturing whitworth-headed bolts with metric threads on them!

Cheers Charlie

The metric system was introduced to France after the revolution, but before Napoleon, although Napoleon spread it across Europe. Despite this it was less generally used even in France than is often supposed. In France, universal adoption did not happen until after WW2, as the result of the fact that almost everyone was either in the military, or dealing with the military - and they were definitely metric. Look at the UK today - officially metric, but the roads still seem to be in miles for example.

It is difficult to be certain what threads Solex would have used when they started - almost certainly it would have depended on where they bought their tooling from - which could have been anywhere in Europe - and the major industrial power in Europe was the UK, probably followed by Germany; and the USA was starting to export industrial tools. But the probability is that they would have been using French Metric, which in 6mm is the same as ISO.

But manufacturers have always tended to do anything feasible to make it difficult for competitors to make parts to fit their products - and one way of doing this is to use an obscure thread standard!

John