Caterham Seven User Manual Page 143

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9.7) Radius arms
If Watts link has been specified refer to
next section (Watts link assembly).
Fit the radius arms to the lower chassis
bush with the waisted section facing
outboard, to provide maximum clearance
to the brake calliper. The arms are fitted
using M10 x 65 mm cap head bolts
(fastener pack 30R011A Item 2) passed
from the inside of the cockpit through the
radius arm and secured with nyloc nut (8)
and plain washer (14). The bolts should
be tightened to 34 Nm with the arms
parallel to the ground. This preloads the
bushes in the correct position for when the
suspension is properly loaded.
Fit the rear end of the radius arm between
the brackets on the top of the De Dion
tube using bolt (3) passed inboard and
secure using a nyloc nut (6). Do not fully
tighten.
9.8) Watts link assembly (optional)
The Watts link replaces the conventional
single radius arm location of the De Dion
tube by employing two links, one facing
forward and one facing rearward
connected via a bellcrank.
9.8.1) Construction of link arms
Thread the rod ends (polythene bag
marked 'rear suspension') with nut
(fastener pack 30R012C Item 5) and fit
into the four linkage arms. Adjust the
length of the link arms as shown in Figure
127. Tighten locknuts.
Figure 126: Watts link - RH side
1. Bell crank
2. Rod end
3. Locknut
4. Link arm (forward)
5. Link arm (rearward)
9.8.2) Link arms to bellcrank
Fit the short rearward link arm (waisted
section inboard) to the larger offset
mounting on the bellcrank using bolt (3)
passing from inboard to outboard and
secure with nyloc nut (6). Ensure that the
larger offset of the bellcrank faces
downwards and the links are inset
towards the vehicle centre line.
Fit the long forward link arm to the upper
mounting on the bellcrank using bolt (3)
passing from inboard to outboard and
secure with nyloc nut (6). Ensure that the
waisted sections in the forward link arm
are facing outboard.
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