944 Driveline Information - Page 2
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944S2 and early 968 Split Torque Tube Problems
We have found that 944S2 and early 968 "split" torque tubes have problems with keeping the front bearing unit in place. This is due to the split widening and letting the front bearing unit spin around with the drive shaft. It then gets caught at an odd angle to the drive shaft and comes apart. This will cause a vibration to be felt while driving and could possibly damage the drive shaft. The split also allows more debris and water to migrate into the torque tube which also hastens the damage to the bearings within it.
Below is a picture showing the split which is located on the bottom of the torque tube as it sits in the car. It extends from the front of the torque tube to the shifter mounting point. This split is usually covered by silver duct tape from the factory.
The picture below shows a customer's 944S2 torque tube that came in for a rebuild. The picture was taken through the split and shows the front bearing insert had delaminated from the metal substrate which is still in the bearing. The thin rubber is on the drive shaft.
The next picture shows this same bearing unit out of the torque tube where the delamination of the bearing insert can be more easily seen.
The delamination of the front bearing insert caused some damage to the drive shaft seen in the pictures below. The coating Porsche put on the 944S2 and 968 drive shafts for extra protection due to the split design has been worn off which allowed rust to start migrating under this coating.