You can't remove the oil pan with the engine in the car. Don't even try it or you'll end up with a LOT more leaks! Been there...
The good news is you CAN remove the timing chain cover with the engine in place. You'll have to remove the harmonic balancer and, I believe, water pump to do it. When you do all that replace the gaskets (even if new) and use RTV.
As Tom said there's a thick rubber seal there that's not part of the side oil pan gaskets.
Last edited by gbauer; 12/29/16 03:12 PM.