On the telescopic rack are installed: a coil spring, a rubber buffer of the compression stroke and the top support of the rack. The upper support is attached to the body mudguard strut. The telescopic strut rests on the ball joint of the suspension arm.
The anti-roll bar is a bar, the knees of which are connected to the transverse suspension arms through rods with rubber-metal hinges. The middle part of the rod is attached to the cross member of the front suspension brackets with rubber pads.
Wheel travel, mm:
- up: 94;
- down: 106.
Characteristics of front suspension springs
*From model year 1980, unmarked or red indexed front suspension springs have been used.
Shock absorbers
Double-acting hydraulic telescopic shock absorbers.
Shock absorber characteristics
On some vehicles with reinforced suspension, Bilstein brand shock absorbers with different characteristics were installed instead of Vode brand shock absorbers. In this case, stiffer suspension springs were used.
Since the 1977 model year, the characteristics of the Boge brand shock absorbers installed on the models have been changed «525» And «528».
Catalog number: 1 112 018 2.
Letter index: «L».
Shock absorber length, mm:
- stem extended: 625.5;
- with stem retracted: 448.5.
Since the 1980 model year, the following Boge brand shock absorbers have been installed.
Shock absorber characteristics
Since the 1982 model year, some characteristics of the front suspension shock absorbers have been changed.
The volume of oil enclosed between the strut body and the shock absorber cylinder, cm3: 30-35.
Boge brand shock absorbers were installed on cars of all models. Marking «n» on the top mount nut. Shock absorber catalog number: 1 124 294.
Suspension arms
Ball joint brand» suspension arm: Lemforder or Ehrenreich.
Overturning moment of the ball pin, kgf·m:
- Lemforder margin hinges: 0.50-0.70;
- Ehrenreich brand hinges: 0.15-0.50.
Maximum clearance in ball pin height, mm: 1.4.
Roll Stabilizer
Diameter of the bar of the stabilizer bar, mm:
- «518», «520»: 21;
- «520» with automatic transmission, «520i»: 22;
- «525», «528»: 23.
From model year 1982 stabilizer bar diameter for BMW «518», «520i», «525i» wounded 16 mm. For «528i» - 17 mm.
Front axle
Front wheel alignment
Convergence*, mm: 1.5+1-0.5
Camber*, mm: 0°30'±30' (for reference).
Pivot Angle (for reference):
- longitudinal: 7°40'±30';
- transverse: 8°30'±30'.
Permissible difference in the longitudinal angles of inclination of the axes of rotation of the wheels, not more than: 0°30'.
The largest angle of rotation of the wheels:
- internal: 43°;
- outdoor: 34°.
The difference in the angles of rotation of the wheels when turning:
- inner wheel: 20°;
- outer wheel: 18°30'.
* For a car with a full fuel tank under load, which is distributed by 68 kgf in the front seats plus 68 kgf in the rear seat plus 25 kgf of cargo in the left side of the luggage compartment.
From model year 1978, front wheel alignment for models «525», «528» And «528i» have the following meanings:
- camber: 0°±30';
- transverse angle of inclination of the axis of rotation: 8°±30'.
Maximum turning angle of the inner wheel: 44°.
Since model year 1980, the front wheel toe-in is 0°19'±5' or 2.0±0.6 mm.
Since model year 1982, for all models, the difference in the angles of rotation of the wheels on the bend at the angle of rotation of the inner wheel of 20°is -1°50', the camber of the front wheels is -0°20'±30'; longitudinal angle of inclination of the axis of rotation: 8°20'±30'; transverse angle of the axis of rotation: 12°±30'.
Front wheel hubs
The wheel hub rotates in two tapered roller bearings.
Axial clearance of bearings, mm: 0.02-0.06 (from model year 1980: 0-0.05 mm).
Lubrication quantity (Shell Darina type, dropping point: 260°C), laid down, g:
- in bearings: 50;
- in the hub cap: 20.
Tightening torques of the main threaded connections, kgf·m
- Nut for fastening the telescopic rack to the lower support: 7.2-8.0 (7,8-8,6) *.
- Nut of fastening of the top support of a telescopic rack to a body: 2,2-2,5 (2,2-2,4) *.
- Nut of fastening of the ball joint of the steering rod to the steering knuckle: 8.1-9.0.
- Nut and locknut for fastening the connecting rod of the stabilizer to the suspension arm: 6.0-7.0.
- Suspension arm bolt nut: 8.1-9.0**.
- Extension nuts: 7.0-9.0**.
- Rack body nut: 12.0-14.0 (14,0) *.
- Bolt for fastening the front suspension cross member to the side member: 7.3-8.0.
- Nuts of a bolt of fastening of a bar of the stabilizer of cross-section stability: 4,4-4,8.
* From model year 1982.
** For vehicle under load, see «Front wheel alignment».