Porsche IMS Bearing Replacement

IMS "Intermediate Shaft Bearing"

Porsche IMS Parts

The purpose of the intermediate shaft is to drive the camshafts indirectly off the crankshaft. By using an intermediate shaft, the speed of the chains are reduced, which is better for chain life. This basic design was used throughout the entire lifespan of the aircooled six-cylinder Metzger engine used through 1998. The inclusion of an intermediate shaft which drives the camshafts indirectly off the crankshaft has been a mainstay of the horizontally-opposed flat 6 engine utilized by Porsche.

One thing is for sure. Once you have experienced an IMS bearing failure, there is no turning back. A complete engine dis-assembly is required to replace the intermediate shaft and in most cases, complete rebuild or engine replacement is your only option.

"So, its essential to perform replacement at the early stages of wear"

Auto Parts

Affected Models (1997-2008 model years)

  • Boxster (2000-2005 are most problematic)
  • Cayman
  • 911 (996 version most problematic)
  • All M96/M97 Engines are prone to IMS Failures


  • Rattle when starting the engine or when accelerating
  • Metal Shavings/debris found in oil or oil filter housing

Highly Recommended

  • Oil filter adapter and spin-on filter for better filtering
  • Rear Main Seal
  • Oil Service

At Real Autohaus, we invested on tooling to perform IMS retrofit service correctly. Have the peace and mind that your beloved Porsche will be taken care of and put you and your Porsche Back on the Road! Call us for more information, to get your Porsche IMS bearing replaced and for pricing.


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