A45 AMG diff problem?
Discussion
Hi guys,
I took delivery of my 64plate A45 AMG on Saturday. (51k miles)
Yesterday morning I noticed a clunk noise at the rear when turning while doing just over manouvering speed.
I called the dealer, who said this was normal on a 4WD.
It seemed a little worse today so I called into the MB dealer, who again said it was normal, but agreed to go for a test drive with me.
He heard the noise, this time quite quiet, and agreed it was normal, but a little further down the road, it did it a lot louder, which he was concerned by, so took a mechanic out in it. He told me it appears the diff might have gone, and to check with the garage regarding warranty. He said it was still fine to drive though.
Anyway, I took it home and needed to use it a few hours later.
This time it was way worse. Horrible grinding noise and more or less constant so I turned back and when I pulled on the drive, there was a huge patch of oil which appears to have come from the rear centre of the car.
I'm no mechanic by the way.
So, my question is, does anyone know what this could be, is it the diff?
Any help is appreciated.
I took delivery of my 64plate A45 AMG on Saturday. (51k miles)
Yesterday morning I noticed a clunk noise at the rear when turning while doing just over manouvering speed.
I called the dealer, who said this was normal on a 4WD.
It seemed a little worse today so I called into the MB dealer, who again said it was normal, but agreed to go for a test drive with me.
He heard the noise, this time quite quiet, and agreed it was normal, but a little further down the road, it did it a lot louder, which he was concerned by, so took a mechanic out in it. He told me it appears the diff might have gone, and to check with the garage regarding warranty. He said it was still fine to drive though.
Anyway, I took it home and needed to use it a few hours later.
This time it was way worse. Horrible grinding noise and more or less constant so I turned back and when I pulled on the drive, there was a huge patch of oil which appears to have come from the rear centre of the car.
I'm no mechanic by the way.
So, my question is, does anyone know what this could be, is it the diff?
Any help is appreciated.
Josho said:
Terrible advice to keep driving it.
If it goes it can potentially lock both rear wheels up solidly.
If it goes it can potentially lock both rear wheels up solidly.
And if it's dumped all its oil on your drive, that's probably not that unlikely. It will get very hot very quickly if driven (or indeed towed). If it failed that soon after you got the car they should fix it for free; they'd struggle to argue the fault wasn't there when you bought it or that the car is "fit for purpose" with a knackered differential.
Edited by kambites on Tuesday 26th September 08:14
kambites said:
Josho said:
Terrible advice to keep driving it.
If it goes it can potentially lock both rear wheels up solidly.
If it goes it can potentially lock both rear wheels up solidly.
And if it's dumped all its oil on your drive, that's probably not that unlikely. It will get very hot very quickly if driven (or indeed towed). If it failed that soon after you got the car they should fix it for free; they'd struggle to argue the fault wasn't there when you bought it or that the car is "fit for purpose" with a knackered differential.
Ahbefive said:
But where would the rear diff have gone?
My S60R has a Haldex awd system which I should imagine is similar, 125k miles on and has never had to have a diff. 50k miles is pretty poor.
I'm guessing your S60R hasn't been beaten everywhere and launched at every available opportunity.My S60R has a Haldex awd system which I should imagine is similar, 125k miles on and has never had to have a diff. 50k miles is pretty poor.
JB! said:
I'm guessing your S60R hasn't been beaten everywhere and launched at every available opportunity.
True, it doesn't get launched with the old "let go of the clutch" method but it has had a couple of track sessions and some quite hard driving at times as well a as making similar power and torque to an a45.Maybe this a45 has had launch control engaged at every set of traffic lights for 59k miles or has a poorly made diff. Doesn't sound like a keeper.
Ahbefive said:
Maybe this a45 has had launch control engaged at every set of traffic lights for 59k miles or has a poorly made diff. Doesn't sound like a keeper.
Without knowing the history of the car, that sounds a bit unfair.Apart from anything, you dont need launch control to burn off pretty much everything else at the lights anyway if thats your bag, and to be honest its more hassle than its worth to try to engage it, relative to the time it might actually save you.
Could be a straightforward failure. Its a lot of power to be putting down the road.
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