Primary tensioner

[namloop]

I wanted to confirm that there is /isn't anything that goes on the primary chain tensioner stud other than the lockwired castle nuts holding the Tensioner in place.
I have in the back of my mind there was a spring plate to give the tensioner some friction or spring tension that went behind the 'T' shaped part.
Should there be a part, its' part number that would assist greatly.
Many thanks
Stephen

[Brian]

There should be a spring plate. I've attached a pic which shows it and the order of assembly. The part number for the spring plate is 67-1263

[namloop]

Brian many thanks that is exactly what I was after.
Can I ask the source of the drawing?
Stephen

[Brian]

Its a scan out of the parts book.

Here's another one.

[fido]

What year is that parts book? My 1948 one does not have exploded diagrams, just pictures of individual parts.  It is one I purchased from BMS and covers all 1948 BSA bikes.

[Brian]

The scan of the complete engine is from service sheet 201.

The scan of the primary chain "tensioner" is from the 49-53 parts book.

As far as I know up until about 1950 they used those small parts books but from then on they went to the larger A4 size ones which are a lot easier to use.