In a message dated 97-02-12 00:12:25 EST, firstname.lastname@example.org (Doug Daverne)
> One note on the ground wire on the pinion oil plug; if you have a very
> TR-4 (such as a 1962) with a solidly mounted rack (no rubber mountings
> is) then you won't have originally had this extra ground cable and
> technically you don't need it. Later cars with rubber mounted racks must
> have it. This is not to say that you won't benefit from it in the event
> that your aluminum rack mounts are all corroded up or something.
> Just my 2c worth.
Doug, thanks - you are correct. BTW the front steering mount brackets were
changed at CT20064 - from that number through the end of the TR4's (about CT
40XXX) and through the TR4A's (and possibly through the TR6's) the ground
strap is needed since the rack is electrically insulated by the mounts.
This is just another example of the importance of commission numbers for
all Triumphs. The commission numbers show when the cars were built. That
plus the "build record" and other historical data also give us an idea of
how each car differs from the ones before. This is impotant not only for
"concours" questions but also in trouble shooting, as your example shows.
When owners come up with a problem, the first question which should be asked
is "What is the commission number?" This gives a good starting point for
Art Kelly '64 TR4 CT33118L (original owner)
VTR TR4 Vehicle Consultant