"Dave Plowman (News)" wrote:

In article ,
The Natural Philosopher wrote:
During the war itself the US kit used American National standards,
previously known as United States Standard. Nothing inter-worked with
British kit. For some kit, such as the Sherman Firefly, this literally
meant one set of spanners to work on the (British) gun and another set
of wrenches to work on the US-built chassis and engine.
A situation that more or less persisted right up to british leyland
days.. I can remember AF spanners on the Chassis and whitworth or BSF on
the endgine, or something.

More likely a mix of Unified and Metric, if BL. BMC - different.
Most of the engines, etc BL used were designed before they were formed and
used Unified. It would make little sense to re-engineer for another thread.


My father's 1970 Hillman Avenger needed two sets of spanners to work
on it. I cannot recall which two types they were, but the engine
needed one set and the rest of the car the other.