The great V8 engine of your 928 can be completely broken if you do not tackle this problem. This is called the Flexplate problem.
The flexplate problem ensures that the crankshaft is pushed forward, so that the axial crankshaft bearings will wear quickly and eventually the crankshaft and the lower block are written off. The crankshaft drills itself through the engine block. It is a matter of only 3 to 5 mm, but it happened.
Many designs and very beautiful products have already been made for this. We have focused on the pure functionality and came to the conclusion that all other designs make 1 mistake. One makes a clamp of two halves on an axis that consists of three segments. The pressure on the three segments is then never the same on the three segments. A simple vector power calculation shows that. The original clamp from Porsche is also designed with a single bolt and two segments.
The clamp that we have designed has also remained relatively small so that the weight remains small. This keeps the centripetal forces that pull the clamp smaller.
This new clamp is made of 3 pie parts that fit perfectly because of the original flexplate coupling sleeve. We use 3x M8 very strong 12.9 Allen bolts to tighten the clamp to 60nm. With this new clamp the problem disappears completely. It holds the drive shaft as the Porsche engineers intended.
Below a photo of the average 928 automatic, before and after unloading the original clamp. It can be seen (with difficulty) that the visible part of the splines becomes shorter. The clamp is therefore slightly shifted by unloading the bolt.
In our opinion, for example, we have managed to realize the best solution for the lowest price. Assembly is fairly simple, you can wait for it. With models up to 86 it is possible in about 2 hours. With later models, the exhaust must first be dismantled.
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
