![]() ![]() ![]() The diff is a BMW Medium188mm open type with a ratio of 3.64:1. This past summer I had the axles out for a rebuild and was able to spin the diff alone and it was obvious this is where the sound was coming from. Anyway, on a few occasion I've had the chance to isolate the noise to the diff. At this point it's enough to vibrate the dash while driving a certain speeds and while it's still not 'loud', when the car stops rolling and things are quite you kind of feel like you just woke up from a Metallica concert the night before. A couple years ago I changed the front wheel bearings and while it got a bit better the noise was still there. Use at your own discretion.įor the past few years I've been noticing a cabin noise that sounded very similar to a wheel bearing on its way out, increasing slowly over time. * Not from BMW or Bentley, derived using best practice. O-ring for the Speed Sensor, available from a hardware store. One came with the Pinion bearings from Thayer below) I have not included specific sizes in the procedure below since I simply don't know if all variants of BMW diffs use the exact same size bearings. OTC 4507 Bearing Race and Seal Driver (I bought my generic kit at Princess Auto (CDN) - try Harbour Freight in US) I used a variety of 'round' things from around the shop. How to fix: Change the Diff Pinion and Carrier Bearings, see below.Īpplicability: Generally this procedure can likely be applied to any rear differential, although the Pinion Bearing preload setting and fastener toque values may vary. Problem: Cabin noise and/or vibration that is not affected by engine RPM or cornering, but is affected by vehicle speed.Ĭause: Differential Pinion and/or Carrier Bearing failure ![]()
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