Doesn't the 80" have BSF threads on the wheel cylinders?
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Doesn't the 80" have BSF threads on the wheel cylinders?
80" has BSF threads for the bleed nipples. I am not certain about the threads for the flare nuts or flexibles. I do remember that the flexibles were easy to get at the brake shop, whereas the bleed nipples had to be ordered from a Land Rover specialist, who I assume had them made.
Aaron
I think you're correct John and I think this applies to all Series 1's and these need to be changed if fitting later wheel cylinders.Quote:
Originally Posted by JDNSW
That would be right - the change to unified threads did not really start until the Series 2. But of course, what is on the vehicle today may well not be what it left the factory with!
JD, you are correct -sort of.Quote:
Originally Posted by JDNSW
The mounting stud/bolt threads are BSF at least on the early 80" cast iron wheel cylinders, but all the 80" brake pipe flare nuts and hose fittings I have seen are UNF as on most post war Girling and other common brands fitted to British cars etc. The 80" (1/4 pipes) use 7/16UNF and 86/107 , 88/109 (3/16" pipes) use 3/8" UNF. Lots of different threads! Some (most?) of the later aluminium wheel clinders have Whitworth mounting threads. Land Rover used BSF, BA for small threads and Whitworth where anything screwed into aluminium castings. Fascinating things threads! Series 1's do have some metric threads in the Solex 32PBI carb, but the linkages all all BSF.
5380.
Ah! But are they ISO metric? Solex started building carburettors in the 1920s, ISO metric was not formalised until the 1940s. Did they change their threads to conform by the 1950s (or ever)?Quote:
Originally Posted by 5380
<br><br> JD, I Think Solex used whatever the engineers and designers came up with. From memory, the 32-PBI-2carbie has a 6mm x 1.0 pitch ISO thread in the distributor advance vaccuum port, but I haven't got a clue what the rest are! 5380.Quote:
Originally Posted by JDNSW
Neither have I! And I would also raise the possibility that the vacuum port is not necessarily ISO, but simply a thread that you can screw ISO into - BA 0, for example is 6mm x !.0, but is definitely not ISO. I doubt they used BA for this application, but as you suggest it is likely to be whatever their designers came up with, which may well have been (by coincidence) very close to what later became ISO, but may be a slightly different thread form.Quote:
Originally Posted by 5380
Quote:
Originally Posted by JDNSW
JD, I can't say this for all 32 PBI-2 Solex threads, but the ones that I have checked are metric sizes. I suppose it makes sense for a French company to use metric. I also assume that when the Poms made them (under licence?) they would not go to the trouble of changing over to imperial thread forms. 5380.
Just to put this sort of thing into perspective, in the early 1920s Morris started buying engines from Hotchkiss' Coventry factory (relocated from France in 1915), buying the company and renaming it Morris Motors in 1925. As a result, Morris car engines used metric threads with Whitworth sized hexagons from then on until new machinery was purchased in the late 1940s. And I doubt those threads were ISO either, although I don't know for sure.