Another chuffing noise
Discussion
Except this one doesn't "chuff", but it's chuffing annoying.
This one is like a whirring noise that starts at about 20mph and whirs according to road speed.
Knocking it out of gear so the engine is idle doesn't change the noise (except it gets slower again).
If I put my hand on the parcel shelf I can feel a related vibration, but equally I can feel it a bit through the steering wheel.
I have tried the following - replaced both front wheel bearings (they seemed fine anyway). Jacked up the rear of the car and then supported the hubs to stress the driveshafts. Then stuck it in 5th on fast idle (=30mph) and listened underneath. Couldn't really hear anything definite.
I have checked fluid levels in diff and gearbox - all OK.
The car went through the MoT with the noise and I got no advisories about noisy wheel bearings, besides the rears seem OK when rotated by hand.
Apart from the noise it drives fine, the noise doesn't vary around corners etc.
Any ideas?
I am thinking of rigging up a clip-on microphone so I can listen to various parts while driving.
This one is like a whirring noise that starts at about 20mph and whirs according to road speed.
Knocking it out of gear so the engine is idle doesn't change the noise (except it gets slower again).
If I put my hand on the parcel shelf I can feel a related vibration, but equally I can feel it a bit through the steering wheel.
I have tried the following - replaced both front wheel bearings (they seemed fine anyway). Jacked up the rear of the car and then supported the hubs to stress the driveshafts. Then stuck it in 5th on fast idle (=30mph) and listened underneath. Couldn't really hear anything definite.
I have checked fluid levels in diff and gearbox - all OK.
The car went through the MoT with the noise and I got no advisories about noisy wheel bearings, besides the rears seem OK when rotated by hand.
Apart from the noise it drives fine, the noise doesn't vary around corners etc.
Any ideas?
I am thinking of rigging up a clip-on microphone so I can listen to various parts while driving.
adam quantrill said:
Hmm I think I'll try inflating them another 10psi, do a quick run, and see if it alters, in that case. Cheap, quick, and worth a try.
Hi,Although my 'chuffing' noise hasn't completely gone, it was the tyre change that reduced it. If the increase in pressure doesn't identify the source, and you can't feel anything wrong with the tyres , how about trying your spare on all 4 corners in turn to see if that makes a difference?Ian
Similar idea but sounds stupid - swap the tyres around.
Your not supposed to swop sides with tyres, as they *do* wear in line with which way they rotate, and they can cause drift/pull/noise issues over time.
(but it's a PITA to swop them all around...)
I had weird squeal noises and a pull to one side (not in wedge) and spent money having the alignment done, was exactly the same. Swopped tyres front to rear
on each side after suggestion from mechanic who did the job ("I know it sounds weird, but....), and the problem magically disappeared....
So if you can't find anything else.....it's possible....
Your not supposed to swop sides with tyres, as they *do* wear in line with which way they rotate, and they can cause drift/pull/noise issues over time.
(but it's a PITA to swop them all around...)
I had weird squeal noises and a pull to one side (not in wedge) and spent money having the alignment done, was exactly the same. Swopped tyres front to rear
on each side after suggestion from mechanic who did the job ("I know it sounds weird, but....), and the problem magically disappeared....
So if you can't find anything else.....it's possible....
Bear in mind that the car went through the MoT with this noise so the bearings must be OK. Brakes and UJ's too.
Today I stuck in 25psi all round and the noise seemed to get less, so maybe it's tyres, I'll try reducing and see if it comes back stronger.
The odd think is that the tyres are well used and the noise has only just appeared, so I have been reluctant to blame them, but maybe it's the tyres, more investigation needed.
Today I stuck in 25psi all round and the noise seemed to get less, so maybe it's tyres, I'll try reducing and see if it comes back stronger.
The odd think is that the tyres are well used and the noise has only just appeared, so I have been reluctant to blame them, but maybe it's the tyres, more investigation needed.
Just changed the diff oil, which was a bit low, by about half a litre, and quite black+silver.
Also noticed the filler plug had some score marks on it, maybe due to being tightened into the hole too much.
As it's a tapered thread I bunged on 3 turns of PTFE take to make it seal with less screwing in.
Anyhow all back together and a test drive and the noise persists.....
Maybe a tyre/wheel swap next...
Also noticed the filler plug had some score marks on it, maybe due to being tightened into the hole too much.
As it's a tapered thread I bunged on 3 turns of PTFE take to make it seal with less screwing in.
Anyhow all back together and a test drive and the noise persists.....
Maybe a tyre/wheel swap next...
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