Section 16: SUPPLEMENT INFORMATION ON INDEPENDENT FRONT SUSPENSION (IFS)
16-16
3.2 Lower A- Arm Central
Joints (Bt-Sectional Bearing
System)
3.2.1 Instructions
All reference numbers mentioned refer to
component parts shown in figure 13.
3.2.2 Stripping Down
1.
The joint is to be stripped down in the
following sequence :
2.
Remove sheet metal-cap (10) with annular
seal (11) and then loosen tightening clip
(7).
3.
Screw out necked down bolt (14) and use
hex screw M 24 x 1.5 x 50 (DIN 961) to
press bracket (15) out of ball sleeve (1).
4.
Remove sealing boot (6) with tightening
clip (7) and clamping ring (8).
5.
Remove circlip (5) and strip down the
bearing elements of the joint (12), (3), (1)
and (2). Then clean out the housing bore
and the circlip groove.
3.2.3 Assembly
Assemble the new component parts of the
joint in the following sequence:
1.
Insert into housing lower elements (3) and
(2) : ensure that ball surface has first been
greased. Then insert bearing element (1)
and the upper bearing elements (2) and
(3) and finally bearing element (12).
2.
Place joint in fixture (C) and mount as-
sembly ring (B) on housing. Thereafter
apply axial pressure F1 through press tool
(A) to insert circlip (5) in housing groove
(For axial load, refer to table 3). Attention
is to be paid to ensure that the circlip eye-
lets are positioned at approximately 90
to
the axis of the tube and that the circlip is
properly seated in the housing groove )
(For Prévost tools #, refer to table 5).
TABLE 3
Suitable for
repair kits
Prévost #
Position
Axial load F1
(kN)
611112
Lower A-arm
200
3.
Use assembly sleeve (D) to mount sealing
boot (6) including clamping ring (8) on
bracket (15). Attention is to be paid to en-
sure that the clamping ring maintains its
correct position in the clamping ring
groove.
4.
Faultlessly apply grease by mechanical
means to bracket-outer core (15) and ball-
inner cone (1). Insert bracket outer cone in
fixture (E) with distance ring (G) and then
use press tool (H) to apply pressure F2 to
press mount with ball-inner cone (For axial
load, refer to table 4).
TABLE 4
Suitable for
repair kits
Prévost #
Position
Axial load F2
(kN)
611112
Lower A-arm
100
3.
After lifting out of fixture prematurely
mount, torque bolt M 14 x 1.5 between 3 to
4 N•m. Finally use a torque wrench to
tighten bolt with a tightening torque of 135
N•m. Ensure that the maximum rotation
during tightening does not exceed one
complete turn. If the specified tightening
torque is not reached during one turn, the
bolt is to be replaced with a new one.
4.
Fill the cavity under the sealing boot (6)
with grease and fix tightly to housing with
tightening clip (7).
5.
Fill the upper cavity of the joint with grease
and then mount annular seal (11) and
sheet-metal cap (10).
6.
Either fix sheet-metal cap to housing
through screwing it into place or through 4
spot i.e. according to individual design
specifications.
