Main gear characteristics
Lateral clearance between the teeth of the driving and driven gears, mm: 0.06-0.11.
The gap between the supporting and adjusting washers of the side gear, mm: 0.05-0.06.
Moment of resistance to turning the semi-axial gears, no more than, kgf·m: 1 (at tightening points for new satellites, no more than, kgf·m: 2).
Moment of resistance to rotation of the drive gear bearings, kgf cm:
- without gland: 30;
- with gland: 32.
Differential bearing preload (for new bearings), kgf cm: 14-16.
Heating temperature of the driven gear during installation, 'C: 80-100. Permissible runout of the drive gear flange, no more than, mm: 0.03.
BMW Rear Axle Performance Features «525», «528» And «528i» from model year 1978
Rear axle performance features from model year 1980
Rear axle performance features from model year 1982
Rear axle oil
Oil used: SAE 90 hypoid oil.
An oil change is not included. The oil should reach the level of the lower edge of the filler hole.
Refueling capacity of the rear axle housing, l:
- before MY 1982: 1.6;
- from MY 1982: 1.8;
- BMW «535»: 1,9.
Rear wheel drive
The drive of each wheel consists of two ball joints of equal angular velocities and a shaft.
The maximum angle of inclination of the wheel drive shaft, degrees: 18.
The gap between the side surface of the hinge and the flange when measured at a radius of 25 mm, mm: 0.08.
The largest allowable displacement, mm:
- hinge:±6;
- axle shafts: 12.
The amount of grease put into the hinge body during assembly, g: 80 (For example. Shell Retinax AM).
Recommended brand of sealant used when installing the hinge cover: Curil K.
Tightening torques of the main threaded connections, kgf·m
- Nuts of bolts for fastening the cover to the rear axle housing: 2.0-2.5.
- Bolts for fastening the driven gear to the differential box:
- «518», «520», «520i»: 8,5-9,5 (bolts are placed on a special adhesive such as Loctite 270);
- «525». «528»: 13,0-15,0 (bolts are put on a special adhesive such as Loctite AVV).
- Nuts of bolts of fastening of a propeller shaft flange to a drive gear flange: 15,0.
- Bolts for fastening the axle shaft to the flange of the output shaft of the differential: 3.0-3.3.
- Nuts of bolts of fastening of a case of the back bridge to an arm of a body: 14,0-15,5.
From model year 1978
- Bolts for fastening the driven gear to the differential box: 16.5-19.5.
- Bolts for fastening the axle shaft to the flange of the output shaft of the differential: 4.0-4.5.