Quote:
Originally Posted by Ancient Mariner
what the hell is that?
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Quote:
Originally Posted by Ancient Mariner
what the hell is that?
Ford 9"Quote:
Originally Posted by Naks
gents, another update on this ongoing saga:
after the new crownwheel + pinion were fitted, the droning noise was still there, so the indie took out the ATB and fitted the original diff, and claimed the noise(s) were gone.
Picked up the landy just after lunch and noticed that between 0-60kmh, there is a high-pitched whine coming from the rear, similar to the jet whine you can hear when a plan is about to land. Above 60kmh, the whine disappear, and once I get up to 80kmh+, there is still a loud droning noise + vibration coming from the rear.
I'm now at a loss regarding this issue (and I'm pretty sure so is my indie), so any recommendations on how to tackle this issue will be much appreciated.
thanks!
can't think of anything other than wheel bearings.
Maybe a hub carrier, or spindle or whatever it's called, could be worn.
The other possibility is that maybe it's the transfer case or something but sounds like it's coming from the rear?
(dunno, just trying to help with various possibilities).
Funny thing about my D1 at the moment is that I've now done well over 2K klms since I first noticed my 'diff drone' noise, and I'm sure it's coming from the rear.
But, it seems to have quietened down a bit compared to how I remember it when I first noticed it a few months back.
There is a remote possibility that I've now gotten used to my noise, as part of a suite of noises that a vehicle will produce(and noting that it's a 300 Tdi D1 .. not the most refined vehicle in terms of NVH!!)
But I'm thinking that maybe the tyres had worn to a specific point and made the noise I noticed, but now have worn past that point and make less noise.
mine sounded like mud tyre droning, but my tyres are Yokohama G012's which have a more road oriented pattern, and are (about) just over 50% tread depth.
They are loud tyres(for what they are), and have been loud from the day I got the car where they were about 5K klms new. Road surface type/condition made a massive difference to how noisy they are.
Yeah, this is why the indie is also stumped - UJs have been checked, prop is perfectly balanced, wheel bearings have been checked, new bearings in the different, etc.
I'm actually considering buying 4 new tyres to rule that out...
Remove the 2 axles the tailshaft lock the diff and go for a drive
AM
So far it seems clear that a specific droning noise is present then ATB centre is fitted, goes away when ATB centre is not fitted. (ignoring other noises for now).Quote:
Originally Posted by Naks
As shared before: Ashcrofts did acknowledge to me that, on occasion, some part of some crown wheel castings can interfere with the ATB housing causing the crown wheel to not sit completely flat.
I just looked up the email I have on this from 2015, here is an excerpt: "...different crown wheel manufacturers use different chamfers on the ID so it doesn't always foul the ATB. [Dave Ashcroft]"
Am thinking that maybe you have struck a couple of crown wheels that maybe do foul the ATB housing, when bolted up the crown wheel doesn't sit perfectly. You get that specific droning noise.
I had the same experience with a droning noise only present with ATB fitted. Was able to actually measure the runout at the crown wheel. Swapped to a different crown wheel (one from my original diff) and no further issue, no droning noises. (must have been lucky this crown wheel didn't foul the ATB housing).
Thanks Neil, but the original diff is back in the vehicle now.
I just drove a 120km round-trip to go see the Ashcroft supplier, and the groaning noise + vibration is still there and getting worse by the km! It is especially loud at 60kmh/2000rpm, disappears a bit until 80-100kmh, at which point it feels like the rear prop will fall out, and then it disappears almost completely once I get up to 120-130kmh.
The Ashcroft supplier seems to think this is a bearing issue as the noise + vibration only appears at specific frequencies.
It sounds wheel bearing or UJ to me - then other bearing in the system.
wheel bearings were replaced last year, and were checked again now, they are fine.Quote:
Originally Posted by garrycol
UJs are also fine, rear prop is 100% balanced.
maybe the pinion bearing?