New RMS leaking days after the swap

Hi guys, hopefully this is not a repost. I wasn't able to find any similar threads. In any case, I swapped the clutch on my 2000 tacoma 3.4 about 8 days ago. I went to a DIY garage to rent a bay, tools and help. While in there I did the rear main seal as well although it was not leaking. I had a mechanic help pull and tap in the new seal, he checked the crank for grooves and got a second mechanic to double check the placement. I bolted everything back up and all was well for about a week. This morning I noticed a decent oil mark on my driveway, but no visible drips. With the motor running I can see about a drip every 10 seconds coming from the bottom of the bellhousing of pretty clean looking oil. I check the PCV valve afraid the excess pressure had blown the new seal, but all seems well. Any ideas what could have gone wrong? It is possible that I did not notice the leak for 8 days, but it seems unlikely. I'm hoping to avoid pulling the tranny again but I'm suspecting no other options.

 

Won't be the first nor last time something like this happens. My son used to have a 1990 5.0 mustang. We were getting ready to take a trip to the coast and he wanted to drive it down so he could "cruise" I suppose. RMS was leaking so we put it up on jack stands, pulled the transmission and flywheel (manual tranny) and replaced the RMS. He cranked it up next morning and it was leaking a small stream. Removed tranny again, noticed that it appeared that the RMS was not solidly contacting the journal all the way around. Got another one from NAPA and did it again. Same result. Went to Ford, payed 4x as much, but the problem was fixed. Sometimes you just get burned on parts. And yes, we did occasionally get bad parts from Ford as well, so dealership parts are not always the answer. Most of the time they are the question, and "NO" is the answer, but sometimes...

You probably have to pull it again. I'd suggest a CAREFUL look, even with a micrometer, to make sure it fits correctly. PITA to replace a $20 part.

 

Thanks for the reply. A PITA for sure. I'm just keeping my fingers crossed that I haven't gotten enough oil on the friction plate to justify another $120 for a new one. I think I will let a professional take care of it this time, my budget doesn't really allow for it. but I'm pretty uninterested in pulling everything again. The kicker is that I used an OEM seal and only did it as a preventative measure so that I would not have to drop the trans again. Sigh