Vehicles before change point in 1982 REPLACING SHOCK ABSORBER Important: When replacing only one shock absorber, always use one of same make. To know whether a shock absorber has to be replaced, check an installed absorber with a shock absorber tester or a removed absorber in a shock absorber testing machine¹).  ¹) See Specifications
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Remove and install coil spring 31 33 100. Pull holder (1) and extra spring with outer tube off of piston rod. Installation: Check extra spring and outer tube, and replace them if necessary. 31 33 100
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Pull out shock absorber (1). Installation: Drain old oil from spring strut tube (2). Pour in engine oil¹) before installing new shock absorber. Important: Store shock absorbers standing upright. ¹) See Specifications
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Vehicles after change point in 1982 REPLACING SHOCK ABSORBER FOR FRONT SPRING STRUT Important! Always replace a shock absorber with one having the same code (K)*. Shock absorbers must be checked with a Shock Tester in the car or in a shock absorber testing machine after removal, to determine whether or not they have to be replaced. Also refer to Service Information 37 02 83 (177). BMW M 635 CSi: Always replace shock absorbers in pairs. * See Specifiactions of Gr. 31
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Remove spring strut assembly - see 31 31 000. Clamp spring strut and Special Tool 31 3 000 in a vise. 31 31 000
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Place Special Tool 31 3 116 on the mount. |  |
Compress coil spring with Special Tool 31 3 111. Important! Pins on mount and Special Tool 31 3 116 must fit in openings. |  |
Lift off cap. Unscrew self-locking nut with Special Tool 31 3 170, counterholding on the piston rod. Installation: Replace self-locking nut. Tightening torque*. * See Specifications of Gr. 31
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Take off washer (2). Screw in Special Tool 31 3 115 the whole length of threads. Release and remove the spring compressor. |  |
Lift off mount. Installed Order: 1 Self-locking nut 2 Washer with small diameter 3 Mount 4 Insulator 5 Washer with large diameter 6 Cap Inside curved surface of insulator (4) faces the mount. |  |
Lift off upper spring retainer with rubber ring and coil spring. Installation: Check upper and lower rubber rings, replacing if necessary. Ends of coil spring must bear on shoulders in lower and upper spring retainers. |  |
Installation: Check protective tube and rubber damper or rubber cover, replacing if necessary. |  |
Unscrew the screw-on ring with Special Tool 31 3 150. Installation: Tightening torque*. * See Specifications of Gr. 31
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BMW M 635 CSi: Unscrew the screw-on ring with Special Tool 31 3 190. Installation: Tightening torque*. * See Specifications of Gr. 31
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Pull out shock absorber (1). Installation: Remove old oil in spring strut tube (2). Pour in engine oil** prior to installation of the new shock absorber. Engine oil is needed to carry heat off of the shock absorber to the spring strut tube. Important! Gas pressure cartridges on the front axle must not be installed with oil. Also refer to Service Information of Group 37. Only store shock absorbers standing upright. If shock absorbers are stored laying down with their piston rods run in, this would lead to a rattling noise when installed again. Remedy: Store shock absorbers standing upright with their piston rods run out at room temperature for 24 hours. |  |
