Rear
INSPECTION, REAR WHEEL ALIGNMENTSpecial tools
- 999 5577 Compression Tool
NOTE: Check pressure on all tires.
1. Raise the rear end.
2. Check for free play in:
- Wheel bearing.
- Support arm bushings.
- Link bushings.
3. Set up the measuring equipment.
- Set up and calibrate according to the equipment used.
- The car should be standing on a level surface with the wheels on free rotating plates.
4. Checking camber.
- The camber angles cannot be individually adjusted.
- Only minor symmetrical faults can be corrected.
- If the camber angles are excessive in some other way the upper or lower link is damaged and must be replaced.
5. Fender edge measurement.
- If the camber angle is being checked the roll angle of the car must not exceed 4'.
- Which is the equivalent to a difference between the sills or fender edges on the left and right sides of the car of max. 2 mm.
- If the angle exceeds 4', adjust using a jack and/or compensating load.
- The fender edge measurement is taken from the fender to the lower section of the wheel rim (to the rim bead).
6. Check the camber angle in relation to the existing fender edge measurement.
- Nominal camber angle is 0.7° ± 0.4°.
- The variation between left and right sides must not exceed 0.5°.
- The camber angle in relation to the fender edge measurement obtained.
- Tolerance between the measured camber angle and value obtained is ± 0.4° .
7. Adjustment of the camber (symmetry fault).
- Example: The left wheel shows a deviation of -10' in excess of the tolerances and for the right wheel a deviation of +10'.
8. Tap out the guide pins to the upper and lower rear axle beam.
NOTE: Press the parking brake cables to one side so they are not damaged by the pins.
9. Remove the screws retaining the lower beam
a. Move the lower beam sideways as far as the free play in the screw holes will permit.
- Moving the beam approx. 1 mm to the right gives a camber change of 15'.
b. Tighten the beam screws alternately from the center.
- Tightening torque 80 Nm (63 ft. lbs.).
c. After adjusting the camber the toe-in must also be checked/adjusted.
10. Toe-in Check/adjust
a. Check the instruments are adjusted in relation to each other on front and rear axle.
- This is important in order to be able to check/adjust toe-in in relation to the car's symmetrical axle.
- The correct toe-in is +6' ± 8', measured for both wheels.
- Deviation from symmetrical axle max. 8'.
b. Loosen nut slightly on track rod inner screw.
- Adjust by turning the screw with the eccentric screws to increase or reduce toe-in.
- Tightening torque 90 Nm (66 ft. lbs.).
NOTE: Check/adjust toe-in variation.
- Only to be carried out if: The car feels wobbly and unstable even though camber and toe-in values are within the specifications.
- The rear wheels' toe-in variation for in and out suspension movement can be checked and adjusted.
11. Check toe-in and note values:
a. Load car so the fender edge measurements are 40 mm less.
b. Check toe-in again and compare values for a loaded vs. unloaded car.
- The difference may not be larger than -3' per wheel, which means the wheel is going toe-out.
c. Adjustment of the toe-in variation can be done if toe-in with a loaded car goes to toe-out.
12. Adjustment of toe-in variation:
a. Raise the car.
b. Remove the wheel
c. Attach the compression tool and press up the lower link, position axle in the tool's fixture holes so the link enters the normal position.
13. Remove nuts to the upper link's outer bushing.
- Knock the bushing screw loose from the stub axle.
- Use a copper hammer.
- Press the link and stub axle apart slightly with a puller 998 7693.
14. Locate the spacer washers between the contact surface on the bushing screw and the stub axle.
- The washers are in two thicknesses 0.5 mm P/N 1387783-2. 1.0 mm P/N 1387758-4.
- Clip or saw up a small slit in the washers, push over the screw and line up after installation.
- Example: To correct 3' toe-out variation 2-3 mm washers are required.
15. Remove the puller
a. Attach a new nut. Tightening torque 115 Nm (85 ft. lbs.).
b. Remove compression tool.
c. Attach the wheel.
16. Check toe-in again in both positions.