By Larry Lees.
As promised, below is what one should need to install a Dana Corp.
cruise control in a Series II XJ6. My car, one of the last Series IIs
built in 1979, has a 4.2 litre engine and dual SU HIF7 carburetors,
so there will likely be some minor differences for other bodies
and/or engines, but they should be minimal and rather obvious.
Installation
The particular unit I installed was purchased from Sears, Model
318.20309. This model came with a turn signal lever that can replace
an existing one (if no other switches are on it), but Model 318.20308
included a clamp-on control switch. Other than the control switch
design, the two units are identical. I installed it in 1987. The
manual for this unit does not say "Dana" anywhere in it, but I
recognized the system as very similar to other Dana units (also
purchased from Sears, but marked "Dana Electronic Speed Control Kit
250-1000") I had installed on other cars as far back as 1978. There
have been some changes over the years -- such as a change from two
drive shaft magnets to one, and deletion of an inertial deceleration
switch -- but all of them that I have seen are installed essentially
the same way.
The installation manual (I still have two of these) is quite
complete and easy to follow. It includes an electrical schematic and
a pictorial drawing that shows how the various components and cables
connect. The cable plugs are all different, so improper connections
are difficult to make.
Follow the manual instructions to install: Drive shaft Magnet,
Road Speed Pick-up Coil, Servo and Disengagement Switch & Valve
Assembly (Brake Switch).
Some judgment must be exercised when mounting the various
components.
Drive Shaft Magnet
I attached the Drive shaft Magnet not far behind the
transmission-drive shaft flange, and mounted the Road Speed Pick-up
Coil (using the L-bracket provided) on the driver's side of the body.
There is ample, protected space in this area on an XJ6.
Servo
I mounted the Servo (using the multi-hole bracket provided) to the
oil dipstick standoff, using the same bolt that holds the dipstick
tube. The bracket sticks up almost vertically, and the Servo is
mounted to point across the rear of the engine. Since the Servo
throttle cable is longer than needed, make a loop in it behind the
engine. Attachment of the bead chain to the throttle linkage, using a
vacant hole near where the accelerator cable attaches is straight
forward. The Servo bracket is strong enough to work well in this
position, and there is still ample room to remove the transmission
dipstick (I have a BW 12).
A rough ASCII-art sketch follows.
_____ ACCELERATOR CABLE
SERVO _________ | ___
_|_ <==> -------O \ THROTTLE LINKAGE,
|| |________ ------ooooO___O---- SHAFT TO CARBS
||___| /\ / \ /\ |
| / \ \_/ / \ |___________ BEAD CHAIN
SERVO | \ |__|_| /
BRACKET ----| | | |
| | |____________ LOOP IN CABLE
|_____| |
|-----| |
DIPSTICK ______| | | REAR OF ENGINE
STANDOFF | | (LOOKING TOWARD
| | FRONT OF CAR)
Control Switch
To get a custom Jaguar look inside, do NOT use the Dana (Sears)
Control Switch. Instead, one needs the following from a Series III
XJ6:
Turn signal switch assembly with cruise set button.
Transmission shift quadrant with cruise on-off-resume switch and
console panel.
Remove the 4-wire plug from the Dana Control Switch cable. Connect
the Jaguar switches to it as follows. This sketch shows ONLY wires
that are different from the Dana (Sears) schematic. Colors for new
wires match Jaguar standards as closely as possible as do the
terminal numbers on the relay. Numbers on the 4-wire plug match the
Dana numbers.
SPEED RELAY ON-OFF-RESUME PLUG
SET _________ _____ ___
___ | | | | | |
| |
87 |----o---o------------ 1
O-----------| |B | | GY
___ 87A 85 | | O O |-------- 2
GROUND---o o--------O O O----o----| | YR
W 86 | | | O O---| |------ 3
| O--------| | | | BGY
| 30/51 |------o---------|
|------------------------------------- 4
W
The Dana cable from the Regulator to this plug has wire colors as
follows:
1 Red
2 Brown (2 wires)
3 Dk. Green
4 Yellow
How the Jaguar switch functions replace the Dana switch functions
should be clear from the Dana schematic. The Jaguar switches are
physically located in two places, but that makes no electrical
difference. A good ground for the Set Speed switch is essential (as
is a good ground for the Servo), but it can be located just about
anywhere.
Once the unit is installed, the check-out procedure described in
the manual should be followed without any changes. Use the electrical
schematic to sort out any errors in the new wiring. Hopefully, this
will not be necessary.
Minimum Speeed Adjust
The pictorial drawing in my manual showed one UNLABELED adjustment
screw on the Regulator. It should be labeled "Minimum Speed Adjust."
The manual describes how to make all set-up adjustments. I set the
Minimum speed at 30 mph, which enables the unit to maintain a set
speed anywhere between about 30 mph and 90 mph. Others may
prefer a different range.
Finishing Up
Once everything has been tested and adjusted, push the Regulator
and excess wiring up behind the under scuttle panel below the
steering wheel. I have not found it necessary to fasten the Regulator
to anything.
One should now be able to enjoy miles of foot-off driving!
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