4410OA CHECKING CORRECT TIGHTENING OF FRONT SUSPENSION - Alfa - 159 - eLearn

939010250 - 4410OA CHECKING CORRECT TIGHTENING OF FRONT SUSPENSION

Position the vehicle on a two column lift.

If the area where the noise is coming from has been identified, firstly check the fastenings in that area, otherwise follow the order indicated.

1. Using a torque wrench calibrated to the recommended value, check that the fixing nuts fixing the shock absorber stem to the mounting (1a) and fixing the shock absorber mounting to the bodyshell (1b) are tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
1a	Nut M10X1.75	Shock absorber	2,5
1b	Nut M10X1.75	Bodyshell	3,5

2. Raise the vehicle and check that the various front suspension fastenings are correctly tightened.Using a torque wrench calibrated to the recommended value, check that the fastenings between the shock absorber and the lower fork (2) are tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
2	Bolt M12X1.75	Lower Fork	7

3. Using a torque wrench calibrated to the recommended value, check that the front nuts fixing the anti-roll bar u-bolt to the engine chassis (3a) are tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
3a	Bolt M8X1.25	Engine Chassis	2,4

- Visually inspect that the rear bolts fixing the anti-roll bar u-bolt to the engine chassis (3b) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
3b	Bolt M12X1.25	Engine Chassis	8 + 90°

- Using a torque wrench calibrated to the recommended value, check that the fastening for the connecting rod upper end (3c) and the fastening for the connecting rod lower end (3d) are tightened to the torque indicated below.

	Type of fastening	Component	Torque (daNm)
3c	Nut M12X1.75	Shock absorber	8
3d	Nut M12X1.75	Anti-roll bar	8

4. Visually inspect that the bolts fixing the track control arm front bush (4a), the track control arm rear bush (4b) and the 3rd fastening securing the track control arm rear bush (4c) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
4a	Bolt M14X2	Arm front bush	17,5 + 45°
4b	Bolt M12X1.75	Arm rear bush	8 + 90°
4c	Bolt M12X1.75	Rear bush 3rd fastening	8 + 90°

- Visually inspect that the bolts fixing the shock absorber fork to the track control arm (4d) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
4d	Bolt M14X2	Fork to lower track control arm	5 + 45°

- Using a torque wrench calibrated to the recommended value, check that the bolts fixing the track control arm to the steering knuckle (4e) are tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
4e	Bolt M14X1.5	Track control arm to steering knuckle	9

5. Visually inspect that the bolts fixing the upper aluminium track control arm to the bodyshell (5a) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
5a	Bolt M12X1.75	Upper track control arm	8 + 45°

- Using a torque wrench calibrated to the recommended value, check that the fastening between the track control arm and the steering knuckle (5b) is tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
5b	Bolt M10X1.25	Steering knuckle	4,5

6. Using a torque wrench calibrated to the recommended value, check that the fixing nut between the steering box rod and the front steering knuckle (6) is tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
6	Bolt M12X1.75	Steering Box Rod	11

7. Visually inspect that the bolts fixing the steering box to the engine chassis (7) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
7	Bolt M14X2	Engine Chassis	12,5 + 180°

8. Visually inspect that the front bolts fixing the engine chassis and the bodyshell (8a), the centre bolts fixing the engine chassis and the bodyshell (8b) and the rear bolts fixing the engine chassis and the bodyshell (8c) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
8a	Bolt M14X2	Front engine chassis	18 + 90°
8b	Bolt M14X2	Centre engine chassis	13 + 90°
8c	Bolt M14X2	Rear engine chassis	11 + 90°

- Using a torque wrench calibrated to the recommended value, check that the bolts fixing the vertical bracket to the bodyshell (8d) and the bolts fixing the vertical bracket to the engine chassis (8e) are tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
8d	Bolt M12X1.75	Vertical brackets to bodyshell	8
8e	Bolt M12X1.75	Vertical brackets to engine chassis	8

9. Using a torque wrench calibrated to the recommended value, check that the bolt fixing the brake caliper to the steering knuckle (9) is tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
9	Bolt M14X1.5	Steering knuckle	16

10. Using a torque wrench calibrated to the recommended value, check that the bolt fixing the brake disc heat shield to the steering knuckle (10) is tightened to the torque given below.

	Type of fastening	Component	Torque (daNm)
10	Bolt M16	Steering knuckle	0,5

11. Visually inspect that the bolts fixing the engine chassis and the engine side connecting rod (11a) and the engine chassis and the gearbox side connecting rod (11b) have not loosened.

	Type of fastening	Component	Torque (daNm) + Angle (°)
11a	Bolt M12X1.75	Engine Chassis	7 + 60°
11b	Bolt M12X1.75	Engine Chassis	7 + 60°