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Originally Posted by NickCats
RMS (Rear Main Seal) wear exhibits itself as an oil drip. Attributed to the design of the crankshaft and its supporting structure as well as poorly designed seals. Porsche has provided at least 3 generations of parts and fix procedures. Said to be more common in stick shift models than in Tiptronic-equipped cars. About $1000 to repair. Repair consists of measuring the crankshaft hole and, if it is within specs, just replacing the seal with a new seal. If it is outside specs (crankshaft wobbles in the hole), then the suggested repair is engine replacement. You shouldn't pay for this yourself, it is a design flaw. Insist nicely but firmly your dealer contact Porsche.
Some cars have experienced multiple RMS problems. Porsche has replaced some of the engines in such cars and in cars where their measurement tool says replacement is the only option. Even out of warranty, they will sometimes buy the engine if you pay the labor.
( from Mike Focke )
The intermediate shaft is supported by a bearing on the rear of the engine. This shaft drive things, like the cams via chains. The bearing was a double bearing then Porsche switch to a single bearing. When the bearing fails it damages the engine. I think this change was made in 2001.
Don't know of any way to prevent it since it is a design issue.
You hear a noise like marbles in a can then the engine stops. A nut on the end of the shaft shears off which leave a hole in the back of the engine for oil to pour out. It is too late for you to do anything.
That is the way I understand it.
( from Tool Pants )
prok / rick - I disagree. While I do think the IMS is indeed rare, I would say the RMS is quite common…
Nick
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Yup, gots me a new RMS at 18,000 miles in my 02 S.
Keeping my fingers crossed for the IMS; however, I understand that it usually happens on vehicles with less than 20,000 or so miles (I just passed 24,000 so hopefully I'm in the clear)?