Porsche has long been revered for its precision engineering and performance, but one issue that has plagued some of its models is the Porsche Intermediate Shaft (IMS) bearing. This small but crucial component can cause significant engine damage if it fails. If you own a Porsche Boxster or 911 996 model with a serviceable IMS bearing, it’s essential to know whether it has been replaced or if it requires replacement again.

In this blog, we’ll guide you through the signs to look for to determine the status of your Porsche IMS bearing:

• What is the IMS bearing and what Porsche models can it be changed on?
• How can I tell if the IMS bearing as already been replaced?
• If the IMS bearing was already retrofitted, if and when do I need to replace it again?

What is the Porsche IMS Bearing and what models can it be changed on?

The IMS bearing is a critical part of the engine in Porsche Boxster, Cayman, and 911 models from 1997-2008, particularly those with the M96 and M97 engines. It supports the intermediate shaft, which drives the camshafts and, in turn, controls the engine’s timing. If the Porsche IMS bearing fails, it can lead to catastrophic engine damage and costly repairs. However, the intermediate shaft bearing can only be reliably changed on 97-05 Porsche Boxster and 99-05 Porsche 911 996 models with the serviceable dual row or single row intermediate shaft bearing.

1997 through 1999 model year Porsche Boxster and 911 996 models were fitted with a dual row Porsche IMS Bearing.

2000 and 2001 model year Porsche Boxster and 911 996 models could have been fitted with either a dual row or single row Porsche intermediate shaft bearing, so as shown below, you have to visually identify which bearing you engine has:

2002 through 2005 model year Porsche Boxster and 911 996 models were fitted with a single row Porsche IMS bearing

2006 through 2008 model year Porsche Boxster, Cayman, and 911 997 models were fitted with the larger, non-serviceable Porsche intermediate shaft bearing.

Some early Porsche 911 997 models and Porsche Boxster 987 models will have the serviceable single row IMS bearing, however model year 2006 through 2008 Porsche Boxster, Cayman, and 911 models will have the non-serviceable intermediate shaft bearing. Learn more about solutions for 06-08 Porsche Boxster, Cayman, and 911 models with the non-serviceable IMS bearing.

How do I know if my Porsche IMS bearing has been changed?

The IMS bearing is a critical part of the engine in Porsche Boxster, Cayman, and The first and most straightforward way to find out if your Porsche’s IMS bearing has been replaced is to check your maintenance records. A reputable Porsche service center or independent Porsche specialist should have a record of any IMS bearing replacement. If it has been replaced, you will see a service entry detailing the work done, including the date and mileage.

Many shops in the past would “reseal” the IMS bearing flange, leaving owners with the false impression that their IMS bearing had been previously replaced. Often owners are mistaken that their bearing has been replaced when in fact only the IMS flange, seal, and center nut may have been replaced when the original bearing was not. Also keep in mind that there was no commercially available Porsche IMS bearing replacement offered prior to 2008.

If you’re a DIY enthusiast or have a basic knowledge of your car’s engine, you can perform a visual inspection. The Porsche IMS bearing is located behind the flywheel, which requires removing the transmission or engine to access. Look for signs of a new IMS bearing, such as fresh gaskets, seals, or markings on the bearing flange that might indicate the engine has been fitted with an aftermarket Porsche IMS bearing replacement.

All IMS Retrofit, IMS Solution, and RND RS Roller IMS kits come with serial number stickers that should placed on the vehicle at the time the installation was completed. Assuming the installation was registered with LN Engineering, you can search the IMS database to see if your car has a registered IMS Retrofit for IMS Soltion installation.

If I have already changed my Porsche’s IMS Bearing, do I need to replace it again?

Unlike the factory Porsche IMS Bearing that had no service interval, replacement IMS roller and ball bearings have (or should have) service intervals for replacement based on time and mileage.

The only exception to this is the IMS Solution that is the only permanent solution to IMS bearing failures. The IMS Solution is designed for the lifetime of the engine and does not require any further servicing.

Some Porsche owners have reported that inspecting the magnetic plug during an oil change can offer clues about the condition of the IMS bearing. If you see metal shavings or debris on the magnetic plug, it could indicate IMS bearing wear or failure, even if the bearing was previously replaced. The vehicle should not be operated until you have time to schedule replacement of the Porsche IMS bearing. Under no circumstances should you drive your Porsche until the intermediate shaft bearing has been changed, so plan on having your Boxster or 911 towed to a shop familiar with these models and experienced with IMS bearing replacement.

LN Engineering’s Single Row Pro, Classic Dual Row IMS Retrofit, and RND RS Roller IMS Retrofit bearings have a 6 year or 75,000 mile service interval (whichever comes first). Exceeding the recommended service intervals for any replacement IMS bearing is not recommended.

The good news is that LN Engineering offers up to a $300 mail in rebate for current IMS Retrofit users or those upgrading from a competitor’s intermediate shaft bearing replacement.

The condition of your Porsche’s IMS bearing is critical to the longevity and performance of your vehicle. Regular maintenance and awareness of the signs mentioned above can help you determine whether your IMS bearing has been replaced or if it needs replacement. If you suspect any issues with your IMS bearing, it’s always best to consult with a Porsche specialist or an experienced mechanic who can perform a thorough inspection and recommend the necessary steps to keep your Porsche running smoothly and reliably. Remember that timely maintenance and proactive measures can save you from costly engine repairs in the long run.

Not sure if your IMS bearing has been changed or when you need to replace your Porsche’s intermediate shaft bearing? Get more info about the Porsche IMS bearing problem and solutions offered by LN Engineering.

Contact our team to help avoid Porsche IMS Bearing Failures today!