I have just bought one of these fabulous cars to restore, it’s
actually the Daimler Double Six Coupe model but I believe they are
similar to the Jaguar version. However I am in need of some help
with my gearbox:
At the moment the car has only 1st and reverse. The fluid is clean,
new and at the right level. I have removed the kickdown switch but
this has made no difference. I have heard that you can adjust
the ‘‘bands’’ from inside the car. What does this mean and can anyone
help?
My first XJ was a DD6 coupe… Whatever you do, however hard it is,
don’t give up on it. Just don’t.
JustinOn 7 Jul 2008, at 19:27, Jon_viola wrote:
I have just bought one of these fabulous cars to restore, it’s
actually the Daimler Double Six Coupe model
–
Justin Hill, Surrey UK
Jaguar XJ12 HE 1982 “The Cuckoo”
Jaguar XJ40 4.0 1989 but actually a 1990 model year specification
Sovereign VIN 605518 “Horn Rimmed Harry”
Land Rover SIII SWB 1980 2.25 Diesel “The Biscuit Tin” @Justin_Hill1
I have just bought one of these fabulous cars to restore, it’s
actually the Daimler Double Six Coupe model but I believe they are
similar to the Jaguar version. However I am in need of some help
with my gearbox:
At the moment the car has only 1st and reverse. The fluid is clean,
new and at the right level. I have removed the kickdown switch but
this has made no difference. I have heard that you can adjust
the ‘‘bands’’ from inside the car. What does this mean and can anyone
help?
The problem may be lack of upshift, Jon - somewhat difficult to
identify. Point being; does it upshift, but then slips or refuses to
propel the car - or will it shift up a very high rpms and perform there?
A band adjustment is sometimes identified by slipping…
Engine vacuum is used in the upshift process, a disconnected vacuum line
or a vacuum modulator fault will delay upshifts - so check that area.
Also; check what happens if you try the gear lever in 2nd - probably
nothing differs, but still…
In reply to a message from Jon_viola sent Mon 7 Jul 2008:
John
The V12 cars were fitted with either a BW12, which is adjustable or
a GM400 which isn’t. The GM 400 has an identifying stamp on the
oil pan indicating its GM origins while the BW has a list of patent
numbers.
If you have the BW12 then the rear adjuster, which is located on
the right hand side of the box, may be accessible through a plate
on the transmission tunnel but the forward band can only be
accessed after the gearbox oil pan has been lowered.
That for the front is a bit more detailed and you really need to
consult the manual (available from the JDHT on CD for under �20)–
The original message included these comments:
At the moment the car has only 1st and reverse. The fluid is clean,
new and at the right level. I have removed the kickdown switch but
this has made no difference. I have heard that you can adjust
the ‘‘bands’’ from inside the car. What does this mean and can anyone
In reply to a message from almcl sent Tue 8 Jul 2008:
I think it’s definitely a BW, thanks so much for the link.
I’ll have a good look asap and report!
Cheers
Jon–
The original message included these comments:
The V12 cars were fitted with either a BW12, which is adjustable or
a GM400 which isn’t. The GM 400 has an identifying stamp on the
oil pan indicating its GM origins while the BW has a list of patent
numbers.