Special Note; General Technical Information - TVR Cerbera Service/Workshop Manual

carefully to ensure that the factory, importer or dealer
receives sufficient information, in the approved form, to
enable speedy dispatch of the correct parts.
Orders for parts should be forwarded separately and not
with correspondence dealing with other matters.
The chassis number, vehicle identification nwnber and
engine nwnber, including all letter prefix and suffixes of
the car concerned must be quoted on every order. This
information is given on the identification plate on the front
panel of the vehicle and on the engine cylinder bJock.
The full part nwnber and description of the parts must
always be given and, if any doubt exists, a sketch or pat­
tern should be forwarded with the order.
(For any special parts that are required and specific details,
such as the part nwnber are not.kno'VVT I , please give as
many details as possible on a separate sheet.)

Special Note

As pipe and hose lengths may vary from time to time due
to variations in production build, please state length
required in addition to the part number
may supply the correct item.
Always specify the dispatch method required e.g. Air
freight, Airmail, sea, post, passenger train etc.
Confirmation orders must be clearly marked to avoid
duplication.
Crates and packing cases used for dispatch goods will be
charged for and credited in full if retu rn ed undamaged
within one month. Damaged and broken parts sent as pat­
terns will not be returned unless specially requested.

General Technical Information

Differential
There are two types of differential. The HYDRATRAK is a
sophisticated LSD that works basically by forcing fluid
through small bleed orifices when one wheel tries to spin
relative to the other. It does this though a series of small
vane pumps in a a similar manner to a vane compressor.
Because of this it should be run in very carefully. The Cone
diff is fundamentally similar to a Salisbury plate type diff
and the same drawbacks apply. One oil will suffice for both
types of diff - MOBIL SHC SOW
wreck the Hydratrak unit itself.
Hosted and optimised by www.TheTVRSite.com
order that we
in
140
IDAny other oil will
-
Running in the diff merely requires a gentle warming up of
the unit and progressively more load over the course of
500
about miles.The Hydratrak unit will only be
operational when there exists a difference in the wheel
speed between the two output shafts and so this requires
gentle cornering loads order to bed the vanes in.
in
The output shafts of the diff do have a little play, this is
quite normal. It is not unusual for the diff breather to vent
a little oil at first. This is usually a sign of too much abuse
too soon. Once it has breathed in this way the oil level will
have found its own position and it should then be OK. It is
a good idea to change the diff oil early on: the
recommended change is at the
12000
every miles. Be sure not to overfill the unit as this
will exaggerate the breather problems. With respect to daily
use both diffs should be quieter than the GKN unit,
although the Hydratrak is a slightly more benign LSD with
a less severe action.
With the Hydratrak there is some free play in the output
shafts which is normal. The internal end of the shaft is
centralised only when there is some torque passing through
the unit.
Dampers
The dampers have been designed and built for the Cerbera
conjunction with an outside specialist. The springs are
in
Eibach springs which are blue at the front and green a t the
rear. The car will always appear high at the rear when
unladen due to the low spring rate and the change in axle
loads when laden. There are also many varieties of
bumps tops. This need not be a problem as long as the
opposite hand is the same.
The bushes are the same as the Griffith.
Brakes
These have been developed in conjunction with AP Racing
4
and consist of alloy piston front callipers and 291mm
2
vented discs with piston rear callipers and
vented discs with integral rear drum handbrake. There is
no balance valve. The front/rear split is controlled by the
combination of disc, piston and pad size. The brakes do
squeal from time to time the cause of which is being
investigated by AP. The pad chamfers should be such that
they contact the disc first. Along with the diff, the brakes
should be gently run in. Only the demo cars have aeroquip
hoses, the production cars have rubber hoses.
1000
mile service then
and
306
mm