Whine/drone THUDDER between 60-70 whilst decelerating *VID*
- Thread starter jamiez
- Start date
From what I can tell, you seem to be in 3rd gear in the latter part of the video at just over 30mph. The frequency of the knocking is about 7Hz, this would correlate with the revolution speed of the wheels. That being the case, I don't think the noise is coming from the propshaft or guibo (flex coupling in the driveshaft). I would look for loose bolts on the half shaft couplings, leaks on the diff output shaft seals (indicating failing bearings), damaged CV joint boots (indicating damaged joints) or perhaps missing anti-rattle clips on the brake calipers (causing the pads to rattle, but braking gently would cause this to go away immediately). I wouldn't rule out wheel bearing problems, but there would normally be a higher frequency rumble, if the noise changes when cornering, this may be the case, I would also check the tightness of the nut on the wheel end of the half shaft in this case.jamiez said:
You may want to duct tape a smart phone or other recording device onto the outside of the car near each wheel to try and pinpoint the closest point to the noise.
The noise in the video doesn't sound like wear in the diff gears or tyre related, in my opinion.
I've previously experienced diff and wheel bearing problems and that sounds wheel-related to me. Is the sound coming from one side or is it central? If it's from one side there's your pointer.jamiez said:
Have you tried swapping your rear wheels over L<->R just to see if that changes anything? Even if your tyres are directional it'll be OK to do this just for a short test on dry roads. Removing the rear wheels to do a swap will also give you a good opportunity to look at the wheels, bolts, tyres, hubs, brakes, suspension, half-shafts and diff etc.
Z4M-2006 said:
I noticed this morning
no damage apart from a slightly scrubbed/ worn bolt entrance now. That will get sorted when I get a wheel refurb done (no scrapes I'm just picky!) That's what a few laps round Malory Park does and that with checking and torquing before!!
Lesson learnt!
Thanks for all advice tho!!