What would cause this?
Presure plate:

Pressure plate side of disc:

Flywheel:

Flywheel side of disc:
Listen to Jeremy, If he isn't spot on then he is on the right track. Better to fix it now than chance it with a new clutch and ruin it.
I would pull the pilot bearing out, clean the hole in the back of the crank VERY well with brake cleaner and a rag. Check and make sure that plug isn't loose or cocked sideways for some reason. If it is loose or crooked then it will need to be pulled out and replaced (which isn't fun). If it is tight and straight take some RTV and seal around the plug. Then when reinstalling your flywheel bolts add some loctit to the threads to seal them up.
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I would pull the pilot bearing out, clean the hole in the back of the crank VERY well with brake cleaner and a rag. Check and make sure that plug isn't loose or cocked sideways for some reason. If it is loose or crooked then it will need to be pulled out and replaced (which isn't fun). If it is tight and straight take some RTV and seal around the plug. Then when reinstalling your flywheel bolts add some loctit to the threads to seal them up.
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The fluid could have been from a failed slave cylinder too. Its really hard to say for sure where it came from tho without a current leak.
The fluid could have been from a failed slave cylinder too. Its really hard to say for sure where it came from tho without a current leak.






My only deduction is that the car had a previous rear main seal leak. They replaced the seal but didn't replace the oil soaked disk. I'd say put a generous amount thread locker on the flywheel bolts, new pilot bearing, new clutch and bolt it all back up.
My only deduction is that the car had a previous rear main seal leak. They replaced the seal but didn't replace the oil soaked disk. I'd say put a generous amount thread locker on the flywheel bolts, new pilot bearing, new clutch and bolt it all back up.
You're welcome. That's what I'm here for. It doesn't look like an original LS1 seal to me. I'd put a new one in while it's apart. The reason oil leaked out of the bolt holes is because they are drilled all the way through the crank and open into the crank case. The bolts don't go down all the way to the end of the threads so there was some oil sitting in the threads. When you pulled the bolts out the oil leaked out.

