I believe I finally found a leak I’ve been chasing. To correct it I’m going to be replacing an expansion plug for the j jet oil galley at the back of the block. Which loctite product do you guys recommend? I believe I used blue loctite on original install. I’m considering one of these 2 retaining compounds. Loctite 641 or 660. Which works the best and has the best guarantee of sealing. I really don’t want to pull this transmission again lol

Well, unfortunately the only leak I have is still coming from behind the adapter plate. This is a new engine I built. I’ve posted about this 2 other times on here. I’ve removed the trans twice and replaced the oring and put rtv on both sides of it. The last time I pulled the trans I also replaced one of the expansion plugs that looked slightly suspicious.I used retaining compound on when installing. I also scraped the block and adapter plate of any paint and cleaned all surfaces. I’m at whits end on this. This will be my 4th time trying to get it sealed up. I’m not sure what else to do at this point. Can I put thread in plugs for the oil galley expansion plugs? I’m not sure if it’s even the plug or cam seal. You can’t clearly tell where it’s coming from each time I’ve pulled it back apart. I’ve never had issues with leaks back there any other time I’ve put together an engine or removed the adapter plate

Anybody have any insight on this? This will be my 3rd and fingers crossed final time trying to seal up the rear adapter plate. New Cummins o-ring the first time, second time new o ring and rtv. The leak slowed some…. Cummins changed the part number and the new o ring seems smaller. I am also attaching pictures of an original next to the new one

Thanks to you guys for join the group. I know at this point it’s still very small. Which is actually surprising to me from the amount of emails and calls I get every month. Anyways. I appreciate you guys coming on the platform and showing up. Don’t forget to post your builds / trucks and what you’re doing. I like to see what guys are up too

Has anyone seen this oil leak before? I think I have a pretty good idea. I’m just hoping that maybe I’m wrong. Lol.