Metallic click-clack noise - NSR
Discussion
Late 2015 Evora 400 (manual)
Anyone had anything manifest itself as a metallic sound going over bumps or on-off brakes when the car is cold?
I've something going on that I can't pin down. The car's been to a local specialist who's checked the wishbones for cracks (none found under UV light), checked for loose 'things' (none found) and I've even had someone take the rear disc off to check the handbrake shoes haven't delaminated (was that either).
I've been reliably informed that 'nothing is going to fall off' and while the car drives fine, going over cobbles here in Edinburgh sounds like a bucket of bolts.
I'm getting the car into a different garage and the instruction will be to focus on that rear quarter and have another look.
I found an aluminium vacuum tank had come off it's mount and hoped that was it, but alas not. Could this be bushes of some sort? Or a brake pad moving? Any suggestions gratefully received.
Anyone had anything manifest itself as a metallic sound going over bumps or on-off brakes when the car is cold?
I've something going on that I can't pin down. The car's been to a local specialist who's checked the wishbones for cracks (none found under UV light), checked for loose 'things' (none found) and I've even had someone take the rear disc off to check the handbrake shoes haven't delaminated (was that either).
I've been reliably informed that 'nothing is going to fall off' and while the car drives fine, going over cobbles here in Edinburgh sounds like a bucket of bolts.
I'm getting the car into a different garage and the instruction will be to focus on that rear quarter and have another look.
I found an aluminium vacuum tank had come off it's mount and hoped that was it, but alas not. Could this be bushes of some sort? Or a brake pad moving? Any suggestions gratefully received.
Sounds like pad rattle
The brake pads moving in their slot and clacking up against the abutment surfaces
Worth checking that the anti-rattle clips are present and correct, maybe give them a tweak to tension them a bit more but otherwise could just be a lower end of tolerance set of pads or an upper tolerance caliper
The brake pads moving in their slot and clacking up against the abutment surfaces
Worth checking that the anti-rattle clips are present and correct, maybe give them a tweak to tension them a bit more but otherwise could just be a lower end of tolerance set of pads or an upper tolerance caliper
Edited by The Wookie on Tuesday 3rd December 12:26
No you would get a clack when you touch the brakes but pad rattle stops as soon as you've got more than a few bar of brake pressure
Going over cobbles in an Evora I daresay you're in for a long journey of tracking down a rattle, could be anything. Might not even be suspension, could even be part of the body or something loose in the rear quarter area knocking against the chassis, there's a fair amount of gubbins in there.
ARB drop links are notorious on them and a relatively simple fix so somewhere to start. If it's wheel speed related then I'd be looking at driveshaft but other than that good luck!
Going over cobbles in an Evora I daresay you're in for a long journey of tracking down a rattle, could be anything. Might not even be suspension, could even be part of the body or something loose in the rear quarter area knocking against the chassis, there's a fair amount of gubbins in there.
ARB drop links are notorious on them and a relatively simple fix so somewhere to start. If it's wheel speed related then I'd be looking at driveshaft but other than that good luck!
The Wookie said:
No you would get a clack when you touch the brakes but pad rattle stops as soon as you've got more than a few bar of brake pressure
Ok, I'll try greater pressure in case I wasn't putting enough into it.The Wookie said:
Going over cobbles in an Evora I daresay you're in for a long journey of tracking down a rattle, could be anything. Might not even be suspension, could even be part of the body or something loose in the rear quarter area knocking against the chassis, there's a fair amount of gubbins in there.
Something is moving when it shouldn't be. I'm tempted to get it back on a jack, remove the wheel and go poking things again. The area i can't get at / see is the front nearside of the engine. Hope it's not there. Reason I think suspension is in that last bit before completely stationary when the body settles back there's a sort of release of tension 'crack'. Almost like a bush on a shock settling maybe. That would also tie in with the cobbles side. I'm over thinking it i know.The Wookie said:
ARB drop links are notorious on them and a relatively simple fix so somewhere to start. If it's wheel speed related then I'd be looking at driveshaft but other than that good luck!
What's the test for this? Just grab them and give them a shake to see if things move? I've also heard the ARB D-bushes can be an issue. True or false?You might be over thinking it 
It’s essentially a tub with a fibreglass body snotted to it, the odd creak when the chassis is in torsion isn’t out of the question as long as it’s not too loud!
The bushes tend to be a bit more clonkey when they go, I think they’re usually a bit more obvious if you can get a pry bar on them to apply some side load
It’s essentially a tub with a fibreglass body snotted to it, the odd creak when the chassis is in torsion isn’t out of the question as long as it’s not too loud!
Dr_Rick said:
What's the test for this? Just grab them and give them a shake to see if things move? I've also heard the ARB D-bushes can be an issue. True or false?
I think they’re quite hard to spot as it takes very little play for them to rattle noticeably. Would be my first port of call although it’s usually the fronts that go. My S went through them every 15-20k, I can’t imagine cobbled roads will give them an easy lifeThe bushes tend to be a bit more clonkey when they go, I think they’re usually a bit more obvious if you can get a pry bar on them to apply some side load
I had similar. Loose wheel bolt. The wheel had been refurbished and the paint in the bolt hole a bit too thick. Tightening the bolt compressed the paint which spread slightly over time and effectively loosened the bolt.
Duagnosed by an ex f1 mechanic as no one else could work it out.
Duagnosed by an ex f1 mechanic as no one else could work it out.
blueg33 said:
I had similar. Loose wheel bolt. The wheel had been refurbished and the paint in the bolt hole a bit too thick. Tightening the bolt compressed the paint which spread slightly over time and effectively loosened the bolt.
Duagnosed by an ex f1 mechanic as no one else could work it out.
This is definitely a metallic ‘contact’ / ‘impact’ noise, not a rotational slip / snap noise.Duagnosed by an ex f1 mechanic as no one else could work it out.
I’ve had the wheel off, and separately so have the local specialist and the local brakes places. It’s been fitted fine, but will get the wheel nut pin out later.
BertBert said:
I've had success with those shaker plates that mot and suspension places have in the past. Tracked down an otherwise impossible to find suspension rattle on one in the past.
ETA obviously have to find a place that has one!
Good shout. The local Farmers Autocare to me (that has done MOTs in the past for me) has such a set up. Had them look at the brake shoes in case that was an issue.ETA obviously have to find a place that has one!
Just have to ask nicely I suppose.
Problem solved. It was that top arm bush.
Took it to a local garage I've used before ( RD Motorsport), and Rob took on an unknown task of replacing the bush. He's exceptionally familiar with BMW, but not Lotus, even though the principles are the same.
Old push came out with a bit of persuasion and the use of some adapted metalwork:
Seems the inner nylon part had failed. New push purchased:
Upper arm cleaned for pulling the new bush into place:
New bush installed and 'magic carpet' resumes:
Took it to a local garage I've used before ( RD Motorsport), and Rob took on an unknown task of replacing the bush. He's exceptionally familiar with BMW, but not Lotus, even though the principles are the same.
Old push came out with a bit of persuasion and the use of some adapted metalwork:
Seems the inner nylon part had failed. New push purchased:
Upper arm cleaned for pulling the new bush into place:
New bush installed and 'magic carpet' resumes:
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