[xj] 1978 XJ-C v12 Borg warner Question

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?

Many thanks

Jon–
Jon_viola
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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

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Jon_viola wrote:

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…

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
The archives and FAQ will answer many queries on the XJ series…
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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.

The procedure for adjusting the rear band is the same as that given
for the BW66 here:
http://www.jag-lovers.org/xjlovers/xjfaq/transxadjust.htm

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


al mclean '93 XJS 4.0 - '84 4.2 Daimler - '84 DD6
Telford, United Kingdom
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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.


Jon_viola
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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The archives and FAQ will answer many queries on the XJ series…
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