Join Date: Nov 2004
Location: Spring Mountain Motorsport Ranch, NV
SERVICE BULLETIN Date: 24.08.06 2006/21
TITLE: Ball joint plinth security.
REASON: To ensure that ball joint plinths are properly secured after camber adjustment.
ACTION: On both front and rear suspension, if the plinth for the top swivel ball joint (combined with steering arm on front) is released from the hub carrier to facilitate adjustment of the camber shim plate pack (or for any other reason), it is essential that the correct procedure is followed when reassembling.
Refer to Service Notes section CI (front suspension) page 5 & 9, or DH (rear) page 5 & 9.
See also Service Bulletin 2004/08
- If a steering arm or ball joint plinth bolt is disturbed or removed, the locking action of the thread adhesive will be lost. The bolt must then be completely removed and the old adhesive cleaned from the thread using a wire brush, before finally degreasing with acetone. The bolt holes in the ball joint plinth should also be cleaned.
- If necessary, re-assemble dry to check geometry adjustment.
- On final assembly, Permabond A130 thread locking compound (A912E7033V) should be applied to the bolt thread following package instructions, before fitting and torque tightening.
- In March 2004, the 8.8 grade cap head bolts securing the steering arms to the front hub
carriers, and the top ball joint plinths to the rear hub carriers, were commonised with the uprated 10.9 grade versions used on motorsport cars, with a corresponding increase in torque setting from 45 Nm (8.8 grade) to 68 Nm (10.9 grade). Check the marking around the cap head to establish the grade and appropriate torque setting.
- The 10.9 grade bolts may be used as service replacements on any car fitted with forged steel hub carriers. Caphead Bolt, 10.9 grade, steering arm forward fixing, M10x40 A117W7211F 2 off Caphead Bolt, 10.9 grade, steering arm rearward fixing, M10x60 A117W7213F 2 off Caphead Bolt, 10.9 grade, rear ball joint plinth, M10x50 A117W7212F 4 off
If for any reason a bolt is found to have become loose, and the car has been operated for any period in this condition, the bolt should be renewed as a standard precaution and related components carefully inspected for hole ovality or wear.