No they leak if you line up the seams /halves with the halves of the block and main bearing cap. That was my first and last time I made that mistake only once. the 2 seams can NOT line up on the engine block and the main bearing caps. That is a NO NO.
I agree with you 100%, not arguing, probably should have worded it better on my part. What I meant for the others, just in case anyone didn't get it, there is a wiper edge on the seal
![2-PIECE_REAR_MAIN_SEAL_ORIENTATION copy.jpg 2-PIECE_REAR_MAIN_SEAL_ORIENTATION copy.jpg](https://www.steelsoldiers.com/data/attachments/425/425864-5018dee07ebb1119a75d2dd468805e48.jpg)
, if they're not aligned the same way then it will create a big leak. The seal will fit in either way, you just gotta remember not to flip it around the wrong way. It's easy to do if your rushing around and especially if you are working under the truck and trying to get ot done quick. Take your time and make sure the wiper edges are aligned or you're gonna be doing it again.
What CUCVRUS is saying is true. When I 1st started wrenching, I would place the seal flush with the main cap and dab a little RTV on each end, it helps, but still has the potential to leak, so you rotate the seal about 1/4 way into the cap so the ends are not flush with the cap ends like so...
I grabbed this online, didn;t have a main seal and cap just laying around.