986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Name that Leak

hoyabob2003 · 09-09-2016, 08:32 PM

Well, it was definitely the input shaft seal leaking. Gbox was equally puzzled by this but helpful and responsive over the phone.

They requested that I confirm it was for sure not crankcase oil and that my pilot bearing was not seized or missing.

I pulled the clutch and flywheel - both nearly brand new and in good working order. The RMS and IMS were both dry. I did install a new pilot bearing just to eliminate that as a possibility.

I pulled the main shaft seal of the transmission to find that it was definitely leaking. Interestingly, it was not an OEM part. Comparing the 2 seals side by side, the OEM Porsche part was clearly more robust and had more surface sealing area. I would have expected that a high end company like GBox would have used OEM seals, and perhaps seal failure is really the root cause here.

Then again, only time will tell...

Here's a picture of the 2 seals side by side (The non-OEM seal is damaged due to removal)

09-09-2016, 08:32 PM	#9
hoyabob2003 Registered User Join Date: May 2016 Location: Minneapolis Posts: 35	Well, it was definitely the input shaft seal leaking. Gbox was equally puzzled by this but helpful and responsive over the phone. They requested that I confirm it was for sure not crankcase oil and that my pilot bearing was not seized or missing. I pulled the clutch and flywheel - both nearly brand new and in good working order. The RMS and IMS were both dry. I did install a new pilot bearing just to eliminate that as a possibility. I pulled the main shaft seal of the transmission to find that it was definitely leaking. Interestingly, it was not an OEM part. Comparing the 2 seals side by side, the OEM Porsche part was clearly more robust and had more surface sealing area. I would have expected that a high end company like GBox would have used OEM seals, and perhaps seal failure is really the root cause here. Then again, only time will tell... Here's a picture of the 2 seals side by side (The non-OEM seal is damaged due to removal)