The great V8 engine of your 928 can go completely kaput if you don't address this problem. It is called the flexplate problem.
The flexplate problem causes the crankshaft to be pushed forward so the axial crankshaft bearings will wear out quickly and eventually the crankshaft and lower block are written off. The crankshaft bores through the engine block, so to speak. It is a matter of only 3 to 5 mm but with that it is done.
There have been many designs and very nice products for this. We focused on pure functionality and came to the conclusion that all other designs make 1 mistake. One makes a clamp of two halves on a shaft consisting of three segments. The compression force on the three segments is then never equal on the three segments. A simple vector force calculation shows that. Also, Porsche's original clamp was designed with a single bolt and two segments.
The clamp we designed has also remained relatively small so that the weight remains small. This keeps the centripetal forces pulling the clamp apart smaller.
This new clamp is made of 3 circular parts that fit perfectly around the original flexplate clutch sleeve. We use 3x M8 very strong 12.9 socket head bolts to tighten the clamp to 60Nm. With this new clamp, the problem disappears completely. It holds the driveshaft as the Porsche engineers intended.
Below is a photo of the average 928 automatic, before and after releasing the original clamp. You can see (with difficulty) that the visible part of the splines gets shorter. In other words, the clamp has shifted slightly as the bolt is released.
Thus, in our opinion, we managed to achieve the best solution for the lowest price. Installation is quite easy, you can wait for it with us. For models up to 86 it can be done in about 2 hours. For later models the exhaust has to be disassembled first.
Suitable for all models 928
Porsche 928, 928S, 928S4, GT, GTS
Reference number:
92242125500, 92211604103
Tags:
Flexplate problem, porsche 928 engine problem, wear, torque tube
