Triumph TR2 Service Instructions Manual page 178

FRONT SUSPENSION AND STEERING
FRONT SUSPENSION DATA
Track at Ground (Static Laden)
45"
Castor Angle
......
......
Nil
King
Pin 1nclina&
(Static Laden)
......
7"
Wheel Camber (Static Laden)
......
2"
Wheel Camber (Full bum^ 3") 4"
A ,
"
Wheel Camber
(Full Rebound 2.25") ...... 1"
Turning Circle
............
...... 32'
Back Lock
......
......
......
31"
Front Lock ...... 28.5"
A 20" Back ~ o c k giv&m 18.75"
Front Lock.
Front Wheel
Alignment Parallel to
B"
toe in
Length of Centre Tie Rod
......
19.44"
Length of Outer Tie Rod 7.68"
End Float of Lower Outer shackle
...... Pin Assembly
.m4
to .012"
DESCRIPTION (Fig.
I)
The two front suspension units are of
wishbone construction. Road shocks are
absorbed by low periodicity coil springs,
each of these springs are controlled by a
double acting telescopic shock absorber
fitted inside the coil spring.
The upper wishbones are rubber bushed at
their inner ends to a
fulcrum
pin which is
attached to the spring housing, they are
shaped to form a "U" and the outer ends
are interlaced to accommodate a distance
piece and are secured together by the
screwed shank of a ball joint. This joint is
fitted to, and provides the axial movement
for, the upper end of the vertical link.
The inner ends of the lower wishbone arms
are rubber bushed on each side and are
attached to the fulcrum in mounted on the
upperside of the chassis
& L n
e. The fulcrum
is steadied at its extremities by two support
brackets.
The outer ends of the wishbone arms,
bushed with
a Clevite bearing, are
mounted on either end of a shackle pin.
The shackle pin is splined centrally to fit
transversely into the manganese bronze
trunnion which is threaded to accommodate
the lower end of the vertical link.
Each bushed end of the wishbone arms is
located sideways on the shackle pin by
means of a white metal covered steel thrust
washer, bearing on the screwed trunnion on
the inside and on the outer side against a
steel washer which is secured by a split
pinned castellated nut. During production
the outer lower ends of the wishbone arms
are assembled to the shackle pin to give an
end float of .W4 to .012". The need for
adjustment should only occur when the
front suspension units have been disturbed.
Road dirt and weather are excluded from the
grease lubricated bearings by special oil
resisting rubber seals.
The screwed trunnion at the lower end and
the ball joint at the upper end of the vertical
link provide the bearings for the pivoting of
the road wheels. Road dirt and weather are
excluded from these bearings by a rubber
gaiter interposed between the vertical link
and the ball joint assembly at its upper
end, at the lower end a circular rubber
seal is fitted between the trunnion and the
link. The thread of the trunnion is sealed
off by a disc let into the lower end of the
threaded bore. The steering lock stop
consists of an eccentric roller bolted to the
upper side of the trunnion and abuts
against a machined face on the vertical link.
The vertical link, which couples the upper
and lower wishbone arms as previously
described, is a carbon steel stamping and
carries the stub axle shaft, the brake backing
plate and the steering lever.
The stub axle is of manganese molybdenum
steel, which is mounted as a press taper fit
in the vertical link, is secured by a split pin
locked castellated nut.
The brake backing plate, with the brake
shoes and hydraulic wheel cylinders attached,
is secured to a machined flange on the verti-
cal link by two setscrews with a lock plate
at the lower two points and two bolts of
unequal length at the upper two points.
The longer of these bolts passes through the
front bore of the brake plate, the vertical
link, a distance piece and the steering lever
and is secured by a nyloc nut; the shorter
bolt is similarly secured and utilises the
lower bore.
The front hub is mounted on a pair of
opposed taper roller bearings carried on the
stub axle shaft. The inner bearing abuts
against a projecting shoulder on the vertical
link and its outer ring against a flange
machined in the hub. The outer ring of the