Genuine 2009 BMW 335i Drive Shaft

2009 BMW 335i Drive Shaft Parts Questions & Experts Answers

• Q: What steps should be taken prior to the installation of the rear drive shaft and how should it be properly installed on 2009 BMW 335i?

  A: Prior to installation, inspect the centering dowel on the transmission/transfer case output flange and the centering sleeve inside the driveshaft flex-disc, replacing any damaged components. When installing the centering sleeve over the centering dowel, apply a thin coat of molybdenum disulfide grease (Molykote Longterm 2 Plus® or equivalent). Remove the retaining clip and seal, as well as the insert nut, ensuring to always replace these components at the rear differential with new ones. Clean the insert collar, flange nut, and spline teeth on the bevel pinion, filling the insert collar with a thin coat of molybdenum disulfide grease. Clean the threads of the joint hub to remove all residue, clean the hub teeth, and coat them with a thin layer of grease. Using new parts, place the insert nut with seal in the insert collar of the flange nut and install the retaining clip. Align the matchmarks on the driveshaft with those on the differential and transfer case flanges, then attach the front flex-disc to the transmission/transfer case output flange using new fasteners, ensuring to hold the bolts stationary while tightening the nuts to avoid damaging the flex-disc rubber. Bend the driveshaft slightly at the center universal joint to aid installation, and follow the specified installation sequence: attach the driveshaft to the transmission, then to the rear differential, and finally attach the center mount. Follow the tightening sequence: insert nut to driveshaft, flex-disc to transmission/transfer case, and center mount to chassis. Slide the driveshaft onto the insert nut and secure it finger tight, using a pry bar or equivalent tool to brace the driveshaft at the center universal joint before tightening the insert nut to final torque, which must occur within 5 minutes. Avoid using the flange nut to counter hold the driveshaft to prevent damage to the rear differential, do not reuse fasteners, and do not allow the driveshaft to hang unsupported. Reinstall the center bearing support, install heat shields, and the exhaust system, then conduct a road test to check for noise or vibration.