JHZR2
Staff member
Just bought a 93 Mercedes 300D 2.5 Turbo for my collection. It needs a few things but is a fun little scoot around car. Always wanted one, had been looking and this one just worked out.
Runs and drives really nice, needs minor window regulator and one door lock.
But on the highway, it’s perfectly smooth until I get to 60 mph. Then there’s a rumble someplace in the rear. Not like an unbalanced or bad tire. And doesn’t really vibrate the car. Certainly not the steering wheel.
Underneath all looks good from my inspection. Literally brand new so no I haven’t had it up on a lift and spent hours underneath. The basic checks all checked out…
But it’s weird that like 1 mph difference brings it on like a light switch. Most imbalance issues seem to gradually increase in intensity. Not this.
I’ve never had to diagnose a center support bearing. That’s my initial thought. I think it is kid dependent. At least somewhat.
Wheel bearings have never been so rumbly, though I guess I shouldn’t exclude that. Wouldn’t I feel a bad front bearing through the wheel? It’s been years since I’ve had a bad one.
Thanks!
Runs and drives really nice, needs minor window regulator and one door lock.
But on the highway, it’s perfectly smooth until I get to 60 mph. Then there’s a rumble someplace in the rear. Not like an unbalanced or bad tire. And doesn’t really vibrate the car. Certainly not the steering wheel.
Underneath all looks good from my inspection. Literally brand new so no I haven’t had it up on a lift and spent hours underneath. The basic checks all checked out…
But it’s weird that like 1 mph difference brings it on like a light switch. Most imbalance issues seem to gradually increase in intensity. Not this.
I’ve never had to diagnose a center support bearing. That’s my initial thought. I think it is kid dependent. At least somewhat.
Wheel bearings have never been so rumbly, though I guess I shouldn’t exclude that. Wouldn’t I feel a bad front bearing through the wheel? It’s been years since I’ve had a bad one.
Thanks!