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Car Forum / BMW Cars / April 2005E30 rear differential noise
Working with my first BMW: 1987 325i convertible Love it! has a 3:73 LSD that makes noise; most noticable when the top is down. Is there any way to quiet the diff? Addatives...rebuild... The only way to diagnose it is to put jackstands under the rear control arms. The suspention has to be at ride heighth or you get noise from the CV's if you just jack it up and the suspension is at full droop. The most likely culprit is the wheel bearings. Remove the fill plug on the diff. and see if it is full. If the diff seals leak and it gets low it will cause a whine The diff. bearings can go bad but is rare.The rear U-Joint could be bad but you usually get a vibration through the tunnel If you ned to replace the diff seals, remove the 6 Allenn head bolts from the diff, push it out of the way and pop the spur shaft out of the diff with a pry bar. Pull the old seal out with a flat blade screw driver or a seal remover tool and tap the new seals in with a rubber hammer or be careful with a steel hammer. Good luck. It is very rare that the diff is bad. > Working with my first BMW: > 1987 325i convertible [quoted text clipped - 4 lines] > Is there any way to quiet the diff? > Addatives...rebuild... I was reading your post about the repair of the diff on a 325i.. I've recently bought one with an LSD but I'm dubious as to whether it works or not, it tends to spin more on the left side Unsure as yet which model LSD (S or Z I think the two types are). Does anyone know an effective way of diagnosing, or fixing one? Cheers in advance if anyone reads this. Barclay > has a 3:73 LSD that makes noise; > most noticable when the top is down. > Is there any way to quiet the diff? I was told my 318iS had a bad diff when I bought it, but I didn't believe it. Turned out to be BOTH rear wheel bearings!  SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html Be sure it's not your center driveshaft bearing. |
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