Component Tests and General Diagnostics

CHECKING VEHICLE LEVEL ON FRONT AND REAR AXLE

Preliminary work:
General background on chassis alignment check.
Positioning of wheels.

A. Front Axle





Vehicle level (control arm position):
check with measuring device (01) 123 589 03 21 00, see data. If vehicle level is within limit range of specified tolerances, find mean value of vehicle level (control arm position) to judge whether or not a correction is required.

a) Pull front end approx. 30 mm down and release, then measure vehicle level (control arm position).

b) Push front end approx. 30 mm upward and release, then measure vehicle level (control arm position).

c) Determine mean value of vehicle level (control arm position) from both measurements.

Example:
Control arm position

Nominal value = 56 +10/-15 mm

after pulling downwards = 52 mm
after pushing upwards = 60 mm
mean value = 56 mm

It the measured value lies beyond the tolerance, vehicle level:
is adjusted by changing the installation height of the springs.

Lighting systems:
adjust.

B. Rear Axle





Diagonal swing axle
Difference in height axis inner semi-trailing arm bearing (A) - bottom edge cup for outer constant velocity joint (B).





Diagonal swing axle with starting torque compensation
a = Difference in height axis inner semi-trailing arm bearing (A) - bottom edge protective ring of wheel carrier bearing of semi-trailing arm (B).

Vehicle level (semitrailing arm position):
check with measuring device 107 589 O1 21 OO (diagonal swing axle) or with 107 589 02 21 00 (see data) (diagonal swing axle with starting torque compensation).

If the measured value lies beyond the tolerance, vehicle level:
is adjusted by changing the installation height of the springs. On vehicles with level control, the vehicle level on the front and rear axle must be adjusted, on principle, correctly prior to adjusting the control point.

Front lighting system:
adjust.

Special Tools





Special Tools Used Up To 07/85





The previously used measuring devices (till 07/85) can be converted using mount 107 589 Ol 21 12. Thereafter, mark measuring devices with new part number (starting 08/85).

Special Tools Used After 08/85





Notes

- The vehicle level is measured in ready-to-drive condition. See general check-ups and prior work regarding chassis alignment check.

- On principle, check ready-to-drive level on front and rear axle before checking vehicle level.

DATA