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A new noise... any ideas?

938 Views 9 Replies 5 Participants Last post by  Clarkz71, 
soundquest
Our 95 E320 wagon has begun to make a new noise. The noise is a very low pitched sound -- almost sounds like a subwoofer at 30hz. No grinding, just a smooth very low frequency tone. The sound only appears while on the freeway at 50+ miles per hour when LETTING OFF THE GAS. It is loudest when doing this at 70+ mph. The very second I engage acceleration, the sound completely disappears. Any ideas? Drive shaft? Rear diff? Trans?
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Clarkz71
soundquest said:
Our 95 E320 wagon has begun to make a new noise. The noise is a very low pitched sound -- almost sounds like a subwoofer at 30hz. No grinding, just a smooth very low frequency tone. The sound only appears while on the freeway at 50+ miles per hour when LETTING OFF THE GAS. It is loudest when doing this at 70+ mph. The very second I engage acceleration, the sound completely disappears. Any ideas? Drive shaft? Rear diff? Trans?
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I have a few idea's, but you never reported back after this thread........ 3 months ago??


http://www.benzworld.org/forums/w124-e-ce-d-td-class/1738385-timing-marks-intake-cam-timing-hg.html
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Clarkz71
If anyone knows about health problems it's me, so I sympathize.

On the noise, check the diff oil, maybe drain and refill with fresh.

Have you ever serviced the diff, MB recommends every 30K on
the older cars. I wouldn't push it past 60K
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Clarkz71
sbaert said:
Reread Clark's post, servicing the diff means R&R diff fluid.
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Yes, that's right.

I drain the diff, removing the fill plug first, then the drain so you get nice flow.

Then I'll squeeze a little fresh lube in to flush out as much old oil as possible.

Reinstall drain plug and fill it up until it just starts to drool out.

I use Mobil 1 synthetic gear oil. Spec is 75W85, but the 75W90 is OK
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