Thrust bearing failure

[928 Bro]

928 Super Clamp


Got this link on 928 facebook group about this clamp. Just want to know which models are this affecting old, mid or newer, or are all the 928 Auto having this problem. This is the first I hear of it and was hoping for input. Thanks

[tmpusfugit]

There are people who will contend TBF on occurs on automatics after 1985 or so. However, from a mechanical perspective, it CAN occur on any year under some circumstances. Cars that develop higher horse power are more at risk. Cars that are driven very hard are more at risk. Cars that have had the drive shaft connector improperly torqued are at higher risk. Cars that have never had the flex plate checked for having moved are more at risk. From your information, if you are speaking as to your '80 model it is less at risk than many cars. That said, the flex plate/driveshaft connector should be checked for movement, now. Some suggest making this an annual check..... it is an easy check, but it does require putting the car in the air, removing the bell housing cover, possibly removing the starter, loosening the drive shaft connector, and checking/measuring the amount of fore and aft play in the engine crank, and then reversing the process. 15 minutes to a half hour if you have the tools.....your average "Porsche mechanic" won't have a clue so DIY or a nearby 928 enthusiast is recommended.

[928 Bro]

Thanks for the info. I was wondering if this fell more into the higher power engines, the great advice on the prevented check up was most helpful. thank you

[Linderpat]

if you search thru the work shop manuals, you will not that a clip was used on the end of the spline of the drive shaft at the engine side until 85, then it was dropped. Without the spline, the shaft migrates inward and causes the bearing the wear. I do not know why Porsche would have stopped calling for this clip. Anyway, while tmpusfugit is correct, the common risk on our cars is with the 85 and onward automatics.