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-   -   Whining sound on C280 (http://www.peachparts.com/shopforum/tech-help/137752-whining-sound-c280.html)

leonb 11-20-2005 07:39 AM

Whining sound on C280
 
I just bought a 1999 C280 elegance with about 140 000 km on the clock. The car is in an excellent condition and drives like a dream, but noticed something that really bothers me.

At a speed of about 70 km/h I hear a whining noise. Almost sounds like these old sirenes when they used to warn a city of an air attack (not that I really heard these - as seen on tv ). At first I thought it came from inside the car, like the radio or something, but when I open the window one can actually hear it come from the outside. The sound is quite noticable, but not deafening. When I increase or decrease the speed to above 80 or below 60, the noise goes away.

Does anyone know what the source of this sound is?

swich2mac 11-20-2005 10:06 AM

We previously had a 2000 528 BMW and a 2000 Land Rover Discovery, both of which were of course manufactured by BMW. We experienced the same whining sensation at certain speed intervals and my recently acquired 99 E300 does the same thing coming out of 1st gear and at about 80mph. According to 3 different service departments since 2000, all of them said it was the transfer case (gear box). This seems to be a characteristic of German cars. At least as with our experience.

Scott

leonb 11-21-2005 07:00 AM

Ok I did the following test. At the speed where I hear the whining/singing noise, I shifted to neutral. The sound stayed excactly the same.

What does this exclude: diff, tansmission, anything else.

Any other ideas.

Benzmeister 11-21-2005 08:08 AM

Coul be wheel bearing, does is raise of lower with
 
the speed of the car? I have a 99 C280 and the transmission is very quiet.

leonb 11-21-2005 10:16 AM

The pitch does change slightly, but as I said the noise is in a small band - about 65 - 75 km/h. It could also be at higher speeds, but then the road noise will be to much to notice the whine.

Benzmeister 11-21-2005 11:01 AM

Perhaps it is your tranny, could also be the rear end
 
Have you had the fluids checked at the dealer after you got the car. It has hight mileage correct, even thou the tranny is supposed to be sealed for life, most people with these tranny change the fluid at 100K miles some at 50K, also the rear differential could be the source, or the CV joints in the rear, there are a lot of possibilities. check to see if any booth on the rear axle are cracked. Perhaps the grease is gone? Also could be a sticking, now and then caliper. Lots of stuff to go thru. I would take it to an MB shop or dealer quickly especially if it is the tranny.


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