Car Weight; Spire Speed Nuts - Triumph TR2 Service Instructions Manual

GENERAL DATA
Car Weight
Although no particular skill is required in
Complete Car with
their application, an elementary know-
Tools, Fuel and ledge of the correct way to fit them is
Water necessary. It is not intended to refer to
18 cwts. 3 qrs. 7 lbs. (955 kg.) each type of speed nut in detail and, in any
Shipping Weight
case, the types at present in use are likely to
17 cwts. 2 qrs. 21 lbs. (902 kg.) be increased as production proceeds and t h e
desirability of their employment become
Tyre Sizes and Pressure
apparent.
Tyre Size
......
......
5.50"-15".
Tyre Pressures
2 .
DESCRIPTION
Front
......
22 lbs./sq. in. 1.55 kgsq.1.a. Spire speed nuts provide a compensating
Rear
......
24 lbs./sq. in. 1.7 kg./sq.
a.
thread lock. As the screw is tightened, the
Where cars are to be used for racing or special
two arched prongs move inwards to engage
high testing it is desirable that the Dunlop
and lock against the flanks of the screw
Rubber Company be consulted for special tyres.
thread. The prongs compensate for toler-
ance variations in the screw. A spr@
Water Capacity
locking action is provided by
compression
Cooling System
......
13 pints 7.4 litres of the arch in both prongs and base as the
With Heater Fitted
....
:. 14 pints 8 litres screw is tightened. The combined forces
of the threaded lock and that provided by
Oil Capacity
the spring prevent loosening due to vibra-
Engine-From Dry 11 pints 6.25 litres tion.
Drain and
Refill
......
10 pints 5.7 litres 3. TIGHTENING TORQUES
Gearbox
...... ......
18 pints .85 litres
, ,
with Overdrive 3) pints 2.0 litres Unlike normal threaded nuts, spire speed
From Dry
nuts do not require a great deal of torque
Rear Axle 14 pints .85 litres
when tightening the screw. The retention
. . . . . . . . . . . .
of the screw by the nut depends on spring
Petrol
tension alone. When tightening a screw
into a speed nut, only sufficient torque
Petrol Tank capacity 12+ galls. 57 litres should be used to produce the thread and
spring lock shown in Fig. 3. Excessive
Body Specification
Two seater open sports,
all
weather equipment.
Detachable windscreen of Triplex safety glass.
Provision for fitting aero screens.
Steel body rust-proofed.
Front wings, rear wings and complete front
panel are bolted on detachable type.
Door hinged at front.
Fig.
3
Showing an Untightened Spire Nut on the
left of the illustmtion and on the other
SPIRE SPEED NUTS
side a fully tighxened one.
I.
GENERAL NOTES
These speed nuts are being used in in-
torque will only distort the ends of the
creasing numbers on our products at the
prongs k d
affect
their spring tension and
present time in the place of nuts and lock
may even break them.
washers, as, in many instances, they sirn-
Spire speed nuts can be used indefinitely
plifjl manufacturing processes and speed up
providing they have not been damaged by
assembly work. over-tightening.