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Upgraded Rear Main Seal hack


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Anyone else tried this?

"The GT3 Motorsport seal (not a Porsche standard part) is the same bore size as the 996/997 seal but has two protective flanges at the rear. If fitted in reverse the inner flange forces itself to flip backwards and touch the outer flange which is already forced onto the crank with a spring. This prevents any oil from possibly leaking even if the bore is out of tolerance."

 

 

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Porsche came out with a PTFE replacement RMS about  six or seven years back that has now replace the original seal design for the 986/996/997 cars.  The PTFE seal has proven itself to be a bullet proof replacement for the original Viton seal, although it must be installed at a different depth from the crank flange face, requiring a special tool.  The GT motorsport seal apparently was designed to deal with larger tolerances and became a popular, if expensive, replacement until the PTFE seal hit the market (the PTFE seal retails for less than $20).  The only applications (on the street) now for the GT3 seal is on the early engine cases that test out of round for the standard seal and therefore need the beefier GT seal.

 

We literally have hundreds of the PTFE seals on the street (and track), and have never seen or heard of one leaking.

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