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  #1  
Old 09-10-2008, 08:08 AM
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Low moan at speed?

So at maybe 40 miles and above, I'm hearing a moan that sounds somewhat like a small squadron of corsairs.

I had thought it might be a wheel bearing, though I figured that would be a high pitched noise. Sure enough I needed a bearing replacement. That's now been done, bvut the noise is still there.

I've put the transmission in neutral while cruising. It doesn't seem to effect the sound. Turning the wheel from side to side does seem to make a difference in volume. Tire noise? The tires are only about 4k old, and the noise became noticable only maybe the last 1k miles (?). Drive shaft? Tie rods?

Thanks!!

Chuck

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Old 09-10-2008, 09:21 AM
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Usually the side to side noise change indicates a wheel bearing. Did you change the right one? Could another bearing be bad. With the help of a friend try to isolate the sound front to back and left to right.
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Old 09-10-2008, 10:06 AM
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Agreed, sounds like a wheel bearing again.
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Old 09-10-2008, 10:09 AM
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So wheel bearing does a low frequency "moan" sound? This is kind of like an airplane engine noise. I notice it more if I bear stearing to the right on an off ramp curve, for example.

Thanks folks!
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1982 300D, anthracite grey, 260k miles, Greasecar
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  #5  
Old 09-10-2008, 10:14 AM
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check your differential, change the fluid
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Old 09-10-2008, 10:38 AM
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I wondered about the differential. Would the noise resonate from the front and be affected by steering?
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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com
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  #7  
Old 09-10-2008, 10:51 AM
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Sounds exactly like a prop-airplane. Right turn usually implies left bearing, could be front or rear.
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  #8  
Old 09-10-2008, 10:35 PM
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So that makes sense. The front passenger side was replaced, but the left-hand driver's side was not. Makes the noise if I just bear right on a curve. Also I "wiggle" tested the wheels and felt more from the passenger side, and the mechanic said we'd just replace the one side and "see how it goes." Hmmm.

Anyway, is bearing replacement a DIY job anyway? I looked in the shop manual, and I had thought it required a big press of some sort, but maybe there is a drop in bearing kit?

-Chuck
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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com
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  #9  
Old 09-11-2008, 09:27 AM
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It can be easily done if you don't need to replace the races.I think the races need to be pressed out of the hub. I did one on my 81 and just replaced the bearings which fixed the problem. 1 hr or less of time.
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  #10  
Old 09-11-2008, 10:22 AM
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Thanks, Paul! If I bought the bearing kit, wouldn't it be bearings-in-races, so I wouldn't have to worry about it either way? I'm looking on Fastlane and see a bearing kit for front, around $40.

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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com
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