RMS
Rear Main Seal (RMS)
What rear main seal should I use on my Porsche Boxster, Cayman, or 911 engine
When replacing your IMS bearing, the rear main seal should always be replaced with a Genuine Porsche PTFE rear main seal (RMS). Porsche redesigned the rear main seal for the 97-08 Porsche Boxster, Cayman, and 911 engine several times to address the leak prone design of the original seal. Under no circumstances should any product claiming to add a rear main seal "bearing" or any seal other than a Genuine Porsche seal be used. A leaky rear main seal is not caused by the weight of the dual mass flywheel, but rather from mis-machining of the engine block/case from the factory or if the engine has not been previously fitted with the updated Genuine Porsche PTFE rear main seal. The most current version is a PTFE rear main seal (RMS), part number 0PB-105-249.
How do I replace the rear main seal in my Porsche Boxster, Cayman, or 911 engine?
If the RMS is leaking, the RMS go-no-go tool should be used before fitting a new seal to ensure the leak is not as a result of a defective crankcase. Installation of the rear main seal should be carried out with the Porsche 9699 & 9699/2 RMS tool. Care should be taken to make sure not to touch the new rear main seal during handling and installation.