Porsche IMS Bearing

Porsche IMS Bearing

The intermediate shaft bearing is one of the most troublesome of all of the Porsche engine problems. The Porsche 911 and Porsche Boxster from 1997 to 2005 have a high failure rate of the intermediate shaft bearing also known as an IMS bearing. The intermediate shaft bearing (IMS bearing) supports the intermediate shaft on the flywheel end of the motor. Porsche designed these motors using a sealed ball bearing that is pressed into the intermediate shaft.

The seals and the lubricant inside the IMS Bearing are intended to last for the life of your engine. However, as the IMS Bearing ages, it has the potential to deteriorate. The grease seals enclosing the unit become compromised, hardening over time and losing their tension. As the seal fails, engine oil is able to enter the bearing housing.

The grease seals may still be intact but the permanent lubricant inside the housing has been dissolved. The compromised grease seal now provides a barrier, preventing the seeped-in engine oil from leaving the chamber. The engine oil that has replaced the original lubricant also carries combustion by-products. These combustion by-products can include traces of fuel and moisture that can also contribute to corrosive wear of the ball bearings and the bearing housing's interior.

As inadequate lubrication, extreme heat, and corrosion continue, mechanical deterioration accelerates. The grease seals continue to wear and continue to allow oil to seep inside the housing. The mechanical deterioration inside the compromised bearing begins to release metal debris that is carried throughout the engine through the ciruculation of the oil. As deterioration continues, the seal on the IMS flange will begin leaking due to increased pressures within the bearing. A visible clue to this stage of the deterioration is oil leaking between the engine and transmission. However without removing the transmission, it is difficult to diagnose an oil leak in this area.

So after years of use within the engine, it would appear that oil and contaminants from the engine seep past the bearing seal, wash out the original lubricant and become trapped inside. This means that the bearing begins to wear prematurely. Its design and construction leads to failure of the bearing, which results in catastrophic engine failure.

The intermediate shaft’s basic function is to drive the four camshafts via timing chains. The bearing that typically fails is at the flywheel end of the crankshaft. Both the double row and single row IMS bearings in the M96 engine are prone to this type of failure.

Tuning and performance is a cornerstone of the Parr business and we offer a wide range of performance parts and servicing for all models of Porsche as well as many other manufacturers.

With an online catalogue we believe that we can supply performance parts for all of your porsche modification needs. If you cannot find what you are looking for on our catalogue please give us a call and we may be able to help with you enquiry.

At Parr we are well aware of the fault of the Porsche intermediate shaft and over 25 years experience has proven invaluable in finding a solution. For more information on the Porsche ims bearing and potential solutions please give our helpful team a call on 01293 537 911.