Intake off, not sure if I'm any wiser. Only sign of oil is under the crank position sensor. No sign of any leaks above it, all dry to the touch so that spot of oil further up on the backing plate is still a mystery. Might have gotten oil on there when removing but can't remember doing that so am left a bit perplexed.
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Picture is from when I started untightening the screw but I think the slight gap between the sensor metal baseplate was there with the screw fastened as well. Judging by the caked up area on the old engine block I think it's safe to assume that this is one of the leaks. I still have major doubts as to whether this alone would produce enough of a drip to leak as much as it did in the video. Definitely not the greatest design, could really benefit from being held in with two screws, one either side of the opening but what can you do. Not sure how to make it more secure other than using RTV. Not ideal but what else is there? Brand new sensor with a new O-ring and still looks to be leaking...
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Feeling around back on the transmission side of the block, the area around the gallery plug was slightly damp to the touch and has a yellowish discoloration at the end of the opening but not a clear leak. I thoroughly cleaned the plug from the old sealant and seated it all the way in with white high-temp sealant. This is a bit of a tricky spot as originally it sat only slightly recessed from the flat area so would not have been threaded in all the way. Again though, even if it is leaking, I can't see it producing too steady a stream.
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Only other thing I can speculate on is the oil pan being damaged? The bottom side looks a bit scuffed up so the previous owner must have bottomed out on something somewhere along the line. Pretty weird as the car did have the aluminium reinforcement plate installed when I got it so no idea how it could have picked up this sort of damage. Could this have somehow transferred the forces to the top edge and bent it out of shape somewhat? Unlikely but I'm just clutching at straws at this point. Then again, might be the machine shop's doing when having it washed.
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Absolutely no clue at this point. The maximalist approach would be to get the engine out again, clean up the pan from the old engine and seat that on with a new oil pan gasket, new rear main seal housing with the seal pre-installed, new gallery plug with sealant pre-applied, new O-ring on the crank position sensor with a dab of RTV, new flywheel bolts with sealant pre-applied and go again. Basically throwing a bunch more money and effort at it. Not sure what mental state I'd find myself in if the issue were to persist after all that but honestly no idea what other options I have at this point anymore.