We have seen so many different failures for the M96 engine's. These are the engine in the 996 and 986. The failures have been related to loss of oil pressure causing the main bearings and/or rod bearings to fail, cylinder's scoring resulting in lots of oil consumption and loss of power, broken timing chains, bad head gaskets, and the list goes on.
Most of these failures result in a complete engine rebuild. The last failure we have seen was the strangest one yet. Let me give you a background story first.
This particular car needed a clutch replacement. So the trans, clutch, and flywheel were removed. At that point they figured now is a good time to change the IMS bearing (smart thinking as it is a ton of labor savings). So the engine was attempted to be rotated to top dead center for removal of the IMS bearing. I say attempted to be rotated because at that time the engine would not make a complete revolution.