do 996 911 automatics have the IMS bearing problem?

Asked by Jun 29, 2016 at 10:26 AM about the 2003 Porsche 911 Carrera Convertible

Question type: Maintenance & Repair

4 Answers

2,085

All 996 and 997's built between 1998-2009, regardless of transmission, have about a 5% chance of an IMS bearing failure unless it has been retrofitted with one of the aftermarket upgraded bearings.

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155

The most common deficiency with the M96 engine and its revisions through 2008 is the failure of the ball-bearing found in the intermediate shaft. The intermediate shaft found in the M96 and later M97 engine was revised three times. The earliest design incorporated a dual-row ball-bearing used through model year 1999 and in some 2000 and 2001 models. Starting in model year 2000, Porsche began phasing out the dual row bearing and went to a smaller single row, with significantly less load capacity. From model year 2002 -2006, all engines used this smaller, lower capacity bearing. In all cases these are sealed bearings and can fail causing significant damage. An aftermarket bearing can cost about $3k to have installed, but will eliminate this problem. Since a failure will require a new engine, the $3k is a good investment. If you have a manual trans, have it done when you replace your clutch, if you have the auto-trip trans, have it done when you have your trans serviced at 80k miles.

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15

It should be noted that the 996 Turbos do not have the IMS issues, due to a different engine.

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2,085

Correct, Turbo and GT3 models are based on the Metzger engine which does not suffer from the IMS problem.

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