The IMS bearing is a small, yet crucial, ball bearing situated within the Porsche engine. Its primary function is to support the intermediate shaft, which, in turn, drives the camshafts. While the concept seems straightforward, the challenge lies in the design, particularly in certain Porsche models produced between 1997 and 2008.
The concern stems from the use of a sealed, single-row ball bearing in some of these engines. This design choice, in combination with the engine’s rear placement, exposes the bearing to high levels of heat and potential oil starvation. Over time, this can lead to premature wear and, in unfortunate cases, catastrophic failure.
The consequence of IMS bearing failure is severe engine damage, with repair costs often exceeding the value of the car. Recognising the potential risk, many Porsche enthusiasts opt for proactive IMS bearing upgrades or replacements as part of preventive maintenance.
