Low speed noise

[amolak]

Hi,
When my car de-accelarates to about 5-20 miles per hour I can hear a deep noise coming from under the car. (Like an aircraft)
The car moves with no problems and on accelation there is no problem.
Is it a differential problem?

Pls help
Amo
1998 S280 W140 UK

 

[Brian WH]

Hi,
When my car de-accelarates to about 5-20 miles per hour I can hear a deep noise coming from under the car. (Like an aircraft)
The car moves with no problems and on accelation there is no problem.
Is it a differential problem?

Pls help
Amo
1998 S280 W140 UK

Is it an Exhaust sound of a split exhaust pipe??

Does it sound when stationary and engine is revved up??

 

[amolak]

Definatly not the exhaust. More of a deep grinding noise.
No noise when stationary.
thanks

 

[jaymanek]

Yeh sounds like either gearbox or diff, id put my money on the diff... When was the diff oil checked??

Jay

 

[rosssavage]

Hey peeps, newbie here

Amo, one quick check you can do.. As the car rolls to a stop knock it into neutral, if the noise continues, it's either the input bearing to the diff that has gone or the propshaft centre bearing - if the noise stops when rolling in neutral, it is probably coming from the gearbox.

It may also be worth check-tightening the propshaft to diff input coupling bolts as a friend of mine had one come loose on his 190E Cossie, which made a grinding noise for a bit as the loose bolt hit the surounding structure, until it inevitabely broke, making a bit of a mess.

Hope that helps,
ross

 

[amolak]

Ok thanks I'l try that, I'd be amazed if it was the g/box as MB replaced it at 82k and the car has only done 106k.
The Diff has a oil leak, but my mechanic said it was small and there was still oil in there.