This 2004 Porsche Boxster S is in for IMS bearing replacement.


The IMS is the Achilles heel of 996 and 997 911s (excluding Turbo models) as well as all 986 and 987 Boxsters. IMS stands for intermediate shaft. This geared shaft basically converts crankshaft motion to camshaft motion on either side of the engine.

The IMS bearing supports the intermediate shaft and if it fails it can throw your cam timing which will cause extensive engine damage. This failure can happen at any mileage, with no warning. Your best option if you own a Porsche from the affected years would be to have the IMS bearing upgraded to avoid an engine rebuild or replacement.

While we’re in there, we often recommend a clutch replacement as well (if it’s at or below 50% or starting to fray) since the labor is nearly the same.

Written by Kasey Scahall