Having gone through the whole exercise of having to replace the centre bearing, the following is my perspective.
The simple, but extremely expensive solution is to buy the new propshaft from VW/Porsche.
There is no 'magic' about the VW propshaft.
It is a fine piece of equipment, ensuring a smooth drive (using CVs in stead of U-joints), but it has a fatal flaw (which VW won't admit to).
- A propshaft is a propshaft. There is nothing special about the Touareg's propshaft application. It connects the back of the transfer case to the front of the rear differential. Since both transfer case and differential are mounted on rubber mountings and the rear suspension is independant, it is in fact a very simple configuration (compared to eg a propshaft for a live rear axle).
- VWs choice to have the propshaft designed as a "non-serviceable" item is regretted and stupid. If they just introduced a joint in the propshaft at the position of the centre carrier bearing, and sold the centre bearing as a separate item, it would have saved many owners a lot of money.
- Many vehicles use similar configurations, but the propshaft can be dissembled for repairs.
- There is nothing special about the centre carrier bearing, except that it is a bad design, prone to failure. Most propshafts have centre carrier bearings, but usually of better quality than the VW one !
- The centre carrier bearing can be replaced by the few replacement parts available (eg Rock Auto, Febest, Akkusan of Turkey).
- The dodgy bit is the fact that the centre CV joint needs to be split by mechanically forcing a metal flange open, and re-sealed by having to beat the join closed again!
- Once reconditioned, the propshaft can be balanced by a competent workshop, like any similar prop shaft.
- The cheapest solution is to remove the bearing component from the centre carrier assembly. There is a BMW replacement part available which can be fitted to the VW cage. I have not been able to find the part no, but it is a rubber-mounted bearing with a (total) outer diameter of 90mm and a ID (shaft) diameter of 30mm. This solution can't cost more than a few hundred dollar.
- Another solution is to build a centre carrier bearing up from another vehicle's / generic part.
The critical items are:
* The shaft diameter is 30mm.
* The height of the centre of the shaft above the small VW cross-member is 72 mm.
* The overall diameter of the assembly should be such that it fits in the 'tunnel' in the body.
PS My solution was as follows:
- I opted to have a new bearing built up, because I could not find a local supplier for the 3rd party part.
- In the process of splitting and re-assembling the shaft, the centre CV got damaged (workshop claims innocence).
- I had the centre CV replaced with a U-joint.
- By a stroke of luck I then found an Akkusan bearing and had that fitted.
- At least I now have a prop shaft which any workshop can service/repair.