1982 W123 240TD rear knocking
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Joined: Feb 2020
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240TD W123
1982 W123 240TD rear knocking
The car has done 75K miles. The diff mount, sway bar mounts, control rods are new. The SLS system is perfect and just overhauled with new spheres. The subframe mounts are new.
When I go over small bumps or just minor road irregularities there is a loud thump from the rear. It is not consistent so some bumps make it happen and some don't. It makes no difference what speed I do or what weight is carried.
I cannot find anything loose under the car and riding inside when it happens seems to indicate it comes mainly from the centre by the diff.
ANY ideas what this can be? I seem to have been working on this replacing parts for years!
thanks
When I go over small bumps or just minor road irregularities there is a loud thump from the rear. It is not consistent so some bumps make it happen and some don't. It makes no difference what speed I do or what weight is carried.
I cannot find anything loose under the car and riding inside when it happens seems to indicate it comes mainly from the centre by the diff.
ANY ideas what this can be? I seem to have been working on this replacing parts for years!
thanks
Last edited by sceh; Feb 9, 2020 at 02:58 PM. Reason: spelling
Junior Member
Joined: Apr 2019
Posts: 25
Likes: 4
1982 240 D,1985 300D
The car has done 75K miles. The diff mount, sway bar mounts, control rods are new. The SLS system is perfect and just overhauled with new spheres. The subframe mounts are new.
When I go over small bumps or just minor road irregularities there is a loud thump from the rear. It is not consistent so some bumps make it happen and some don't. It makes no difference what speed I do or what weight is carried.
I cannot find anything loose under the car and riding inside when it happens seems to indicate it comes mainly from the centre by the diff.
ANY ideas what this can be? I seem to have been working on this replacing parts for years!
thanks
When I go over small bumps or just minor road irregularities there is a loud thump from the rear. It is not consistent so some bumps make it happen and some don't. It makes no difference what speed I do or what weight is carried.
I cannot find anything loose under the car and riding inside when it happens seems to indicate it comes mainly from the centre by the diff.
ANY ideas what this can be? I seem to have been working on this replacing parts for years!
thanks
Junior Member
Joined: Apr 2019
Posts: 25
Likes: 4
1982 240 D,1985 300D
The car has done 75K miles. The diff mount, sway bar mounts, control rods are new. The SLS system is perfect and just overhauled with new spheres. The subframe mounts are new.
When I go over small bumps or just minor road irregularities there is a loud thump from the rear. It is not consistent so some bumps make it happen and some don't. It makes no difference what speed I do or what weight is carried.
I cannot find anything loose under the car and riding inside when it happens seems to indicate it comes mainly from the centre by the diff.
ANY ideas what this can be? I seem to have been working on this replacing parts for years!
thanks
When I go over small bumps or just minor road irregularities there is a loud thump from the rear. It is not consistent so some bumps make it happen and some don't. It makes no difference what speed I do or what weight is carried.
I cannot find anything loose under the car and riding inside when it happens seems to indicate it comes mainly from the centre by the diff.
ANY ideas what this can be? I seem to have been working on this replacing parts for years!
thanks
