GEARBOX
SUPPLEMENTARY INSTRUCTIONS
FOR INCORPORATING OVERDRIVE ON
''
SECOND
"
AND
"
THIRD
"
GEARS
I.
The incorporation of Overdrive on
3.
"
Second
"
and
"
Third" gears has
necessitated the following engineering
alterations
:-
(a) Increasing the diameter of the clutch
operation pistons in the overdrive
unit from 19" to 18".
(b) Re-designing the gearbox top cover
assembly to permit the selection of
overdrive in other gears.
2.
OVERDRIVE
UNIT
To enable the unit to transmit the maximum
available torque in the lower gears, it is
necessary to use larger clutch operating
pistons than those fitted previously.
From Chassis No. TS.5980 onwards, all
Triumph Sports Cars, which have been
equipped with overdrive, have been fitted
with the re-designed unit, Part No. 301991
:
Serial No. 22/1374/- incorporating the
larger pistons.
NOTE.
A
small number of cars with
chassis numbers prior to TS.5980 have
been fitted
wjth the re-designed overdrive
unit.
To establish whether or not a re-designed
unit has been fitted, remove the gearbox
floor covering and a brass plate can be
seen bearing a serial number. The old
unit number is 22/1275/-, and the re-
designed unit number is 22113741-.
Unit Exchange
The Spares Department of The Standard
Motor Company Ltd., in conjunction with
Messrs. Laycocks, operate an exchange
system whereby the old unit
can
be
exchanged for the later type at a cost
fixed by the Spares Division of The
Standard Motor Company Ltd.
GEARBOX TOP COVER ASSEMBLY
Fig.
41
To permit the selection of overdrive in
I'
Second
"
and
"
Third
"
as well as
"
Top
"
a new top cover assembly has been designed
and the Part No. is 50241 1.
The new cover assembly has been fitted to
Chassis No. TS.6280 and all subsequent
Sports Cars.
NOTE.
A
limited number of cars prior
to
Chassis No. TS.6280 were fitted wjth the
new cover assembly and can be recognised
by the two isolator switch bosses, Fig. 41.
Modification of Top Cover Assembly.
To modify the old top cover assembly,
thus permitting the selection of overdrive
in
2nd, 3rd and top gears necessitates the
fitting of certain new parts. The new parts
required are detailed under
"
Top Cover
Conversion Pack
"
on page 27.
Top Cover Assembly-Fig. qo--Dis-
mantling. Proceed as follows
:-
(a) Remove the dipstick and ensure that
the selector mechanism is in the
"
Neutral
"
position.
(b) Disconnect the wires from the isolator
switch, where fitted, and remove the
top cover assembly from the gearbox.
(c) Remove the change
s eed lever by
:-
X
(i)
Unscrewing
an
removing the
2''
UNF
setscrew
(1)
which
secures the retaining cap to the
top cover casting.
(ii)
Unscrewing the nyloc nut
(2)
from the pivot bolt.
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