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330ci Gearbox Whine

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330ci Gearbox Whine

Postby bbob1 » Thu, 30 Jun 2005 12:49:51 UTC

Hello all. I was wondering if anyone out there could help me. I have a 330ci 2000 X reg with manual gearbox and 50k on the clock. I get a faint whining from the gearbox in 5th gear at 75mph and above. The noise changes pitch depending upon whether I'm accelerating, steady, or decelerating. The noise isn't very loud and can only be heard with the stereo off and on smooth roads. I sometimes get the same noise in 4th as well. Is some noise normal? The noise is definitely coming from the gearbox and not from the back of the car.

I only have 2 weeks of warranty left so was hoping someone out there could put my mind at rest or make me get moving with a warranty claim.

Thanks in advance for your help.
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Postby jonno_ » Thu, 30 Jun 2005 13:55:10 UTC

Sounds more like the diff than the 'box to me.
But I'm no expert!
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Postby jonno_ » Thu, 30 Jun 2005 13:56:43 UTC

Sounds more like the diff than the 'box to me.
But I'm no expert!
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Postby jonno_ » Thu, 30 Jun 2005 13:58:52 UTC

What happens when its out of gear, @ speed?
(Take care when doing this!)
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Postby Dude » Thu, 30 Jun 2005 14:15:29 UTC

There should not be a whine whether it is coming from the gearbox or final drive, so if you have a full BMW warranty, I would get it into your main dealer ASAP.
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Postby bbob1 » Thu, 30 Jun 2005 16:27:16 UTC

If I take the car out of gear and coast the whine goes away so I guess it must be the gearbox.
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Postby jonno_ » Fri, 01 Jul 2005 09:18:23 UTC

bbob1 wrote:If I take the car out of gear and coast the whine goes away so I guess it must be the gearbox.


Probably, just try a few revs out of gear too - to eliminate engine too.
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Postby Peter » Fri, 01 Jul 2005 10:04:20 UTC

Another difficult problem to identify, (like the 1st gear thread).

Coasting doesn’t necessarily eliminate diff problems.  Or our listening, our perception of where the sound comes from.

Initial diff problems can show up in several ways.  A type of ‘ugh, ugh’ sound, a whine on light pull, and/or overrun, at a very limited speed in one gear, right through to a distinct ‘whine’ that dominates the drive.  But possibly still at a limited load and rpm.  Sometimes will not make a sound out of gear.

It depends if it is bearings, or crown wheel and pinion wear.  Must say it sounds like diff gear wear becoming manifest.

You mention 5th and sometimes 4th.  Is the 4th gear noise at the same road speed or the same engine rpm?  Proportionately at lower loadings?  That is the main clue.  (It can be harder to detect a fault in lower gears, but sometimes it gives much more information).

Same road speed, more likely the diff.  Reasoning… Same diff rpms.
Same engine rpm, more likely gearbox.  Reasoning… same input shaft rpms, gear mesh speeds, resonances, etc.

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Postby bbob1 » Mon, 04 Jul 2005 10:24:34 UTC

Thanks eveyone for your help. The dealer has driven my car and reckons it needs a new gearbox. They need to get some BMW technical representative to test the car before they will approve the warranty repair so I am waiting for their call. I'll keep you all posted.
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Postby lee330sport » Tue, 05 Jul 2005 10:13:57 UTC

This sounds identical to mine at the minute and its definately the diff.
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Postby bbob1 » Tue, 05 Jul 2005 10:38:52 UTC

Sorry - maybe I should have mentioned that I have also recently had a new diff and it made no difference at all. I can also hear the whine through the gearbox as I accelerate in 4th gear.
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Postby lee330sport » Tue, 05 Jul 2005 13:32:03 UTC

Yeah it sounds like the gearbox if you can hear it while you accelerate. I hear mine while just coasting in 6th.
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