I have restored/recreated the drawing number C6792 of the chassis frame
weldment, from the blueprint copy that David found in his car. The full size
blueprint copy he had was on ammonia paper from the 1960s or 70s, folded,
crumbled and faded on the edges of the folds and the sides facing out. I
scanned this one but it was too smudged and discolored so the scanner picked
up every little smudge and it was pretty much useless.
There was also a photocopy reduction, probably made from this blueprint
before it got faded, from which I was able to get most of the detail missing
from the full size print. Most of the lettering on this one was illegible.
Lastly there was a reduced tracing of the frame without any dimensions or
lettering and somewhat distorted in a few areas. I decided to zoom up this
one to 34" x 49" paper and then add all the dimensions and notes to it, as
the fastest way to get something useful.
So it is partly a restoration and partly a recreation. Like some of our
This is the C6792 chassis used on late XK120 FHC and DHC. The original
appears to have been drawn in ink on linen, as on the ammonia print I can
see what appears to be weave lines in places. It seems to have been a
tracing of the OTS chassis drawing C6692. The old drawing number C6692 is
crossed out and the new number written above it. There was a revision block
with revisions going back to 1948, but it was all illegible.
There is also an interesting note:
“with the exception of C5839 bonnet lock channel mounting plate being
welded on in position shown this frame assembly is identical to C6692”
This drawing is what we call a weldment, in that it shows part numbers of
every piece of the frame rails and where to weld all the little brackets and
bits onto the rails, but nothing that was bolted on. Surprisingly it does
not show weld sizes, but it does show certain suspension mounting holes that
were to be drilled after all the welding was done.
The original has a signature which was smudged but I believe it to be that
of Claude Baily the chief designer. I reproduced that signature as best I
could from an autographed dinner menu somebody posted on jag-lovers.
So if anyone wants a pdf file of this drawing, either 2.1 MB or 1.4 MB or
734 KB size, send me a private email and I will send it. Be aware of your
mailbox size, and your spam assassin may think it is spam. I found scans
smaller than 734 KB lost all the interesting detail.
Rob Reilly - 679187