Neither were bad enough to drip on the ground when parked overnight, but there was enough to make things turn oily on the surrounding areas. Before I started the work I knew I had an oil leak out of my front main seal on the crankshaft seal and I thought same for the rear. Recently I did some extensive engine work to my 20 with the 5.9L Cummins engine.Recently I did some extensive engine work to my 20 with the 5.9L Cummins engine. Neither were bad enough to drip on the ground when parked overnight, but there was enough to make things turn oily on the surrounding areas.īefore I started the work I knew I had an oil leak out of my front main seal on the crankshaft seal and I thought same for the rear. I hate dirty engines and grease covered parts. Keep em clean.įYI: My post is not a 100% how to, but a little reference and maybe some help to someone with similar issues. I will start with the rear main seal because it was more straight forward. I had my transmission and flex plate out of the vehicle already, so it was a no brainer to replace this seal. Now when I first started on my truck I 'thought' I had a rear seal leak. Well after further understanding the Cummins adapter plate and the seal, I don't really think I did.

However I had already purchased a Cummins OEM seal before the project started so it was going in lol. The new seal kit from the dealer was 100$ (give or take a bit). It comes with the new seal and the installation tool. That tool is a must have to properly complete this task. Not sure if auto parts store XY or Z sells one with the tool but it makes the install per the book if you will. 2003 DODGE RAM 2500 5.9 CUMMINS REAR MAIN SEAL INSTALL Removal: You need a little screw in slide hammer. I got one for like 15$ at the local cheapo depot tool shop. 2003 DODGE RAM 2500 5.9 CUMMINS REAR MAIN SEAL INSTALL.

5.9 cummins rear main seal