seal on transferchase

[tombje]

I have a AWD 91 and i had a leak in the oilseal on my transferchase for 1 mounth ago. i replaced the seal, but to day the the seal is broken again. Is there some one who can tell me what the problem is.
I have innstaled the seal correct ,and the driveshaft is ok. HELP!!!!!

[johnny-77]

Common posbilitys one the seal design was changed and normal wear is causing tention on one small area, its becoming more of an issue with parts comming out of china manufactures are trying to make the seals more universal. Number two is the yolk is worn and under speed or load is shifting. number three look at the vent tube its could be pluged. Number four a out of ballence shaft can cause seal failer. This ones Ive ran into that were not always easy to find.
Hope this helps!!