Porsche Intermediate Shaft Bearing Repair & Upgrade
Porsche engines (M96 engine designation) used in Porsche Boxsters and 911’s have a weak link in the bearing that is used to support the intermediate shaft. The intermediate shaft runs through the engine underneath the crankshaft. It is the pivot point for the timing chains.
The shaft bearing fails due to lack of adequate lubrication. There is no pressurized oil flowing to the bearing; the only oil lubrication to the bearings seeps from the crank case through the seals of the bearing, slowly.
Failure of this bearing usually starts with a screeching and grinding sound, then catastrophic engine failure soon follows. The shaft contacts other rotating engine components and can easily damaged other major engine components beyond repair (block or case, crankshaft, connecting rods, etc.). Watch video on intermediate shaft bearing failure (dual row type) dissected on video from a Porsche Boxster with a 2.5 liter M96 horizontally-opposed six cylinder engine.