Quote:
Originally Posted by Tannaton
I personally don't see how one could definitively isolate a bearing noise to the AOC or diff since they are essentially a single assembly. Also Volvo don't "open up" either, they will just replace with new. There is a bearing in the Haldex unit at the front to support the input shaft and flange.
hence an experienced specialist is the way to go...
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I agree and in order to assist in the diagnosis I bought a second hand "known good" AOC coupling with a matching part no. which had done 107000 mile and asked the Volvo dealer to try fitting that first. This showed that the noise was still apparent even with the new Haldex fitted, this then prompted them to get the Diff off and checked by a specialist and subsequent diff bearings replaced.
There are loads of specialist gearbox and diff refurb companies out there that usually do a swap +cash (£300 - £500) for your old one. Google is your friend!
The company that Tannaton gave the link do the Haldex's as well (I didn't find anybody at the time, but I was in a blind panic at having to fork out £5.5k on a car that was only worth £3.5k).
I think, but don't quote me on this one, Landrover and Volvo at the time were owned by Ford (Premier Automotive Group - PAG) so shared a lot of common parts. The AOC coupling/Haldex was one of them and the picture of the Gen3 version on their website looks identical to what was in my 56 Plate if that helps.
If you do replace it get a new pump and filter as well.
There is a guy on Ebay "xc90heaven" (Simon) in Warrington who I bought my second-hand Haldex from. He breaks one XC90 at a time in his garage and sells the good bits on-line, maybe see if he is a cheaper option for bits. You won't get a guarantee like you will from a refurber though.
I hope this helps a bit. You problem may well be different to mine but I'm just passing on my experiences.
Cheers
Martin