Genuine part in second picture, would not buy or recommend. Now the adapter was sealed to the block properly so I didnt have to remove it, but where all three pieces meet there was a leak. If I have to pull the trans and buy the specialty tools to replace the rear main seal, I won't be a happy camper. Not worth it, came apart and had major oil leak 10 months after install. Is this a feasible cause? How do you check the PCV system? Just blow some air through the hoses to make sure they aren't clogged? Cummins 24v Rear Main Seal Fix: Learn how to stop an oil leak in a 5.9 Cummins 24v Cummins 5.9 24v Rear Main Seal Leak Replacement. Anyone?Īnother thought I had was that it could be a PCV issue causing abnormal crank case pressure to push oil past the seal. My main question is how does a rear main seal that hasn't been leaking for 80K miles all of a sudden start pissing this much oil out in a 500-600 mile trip? I would certainly think it would be an incremental leak and not just an all or nothing sort of deal. Thinking it might be injectors "making" oil, I had them checked at the local stealershit. Use the MAHLE 67857 Rear Main Engine Crankshaft Seal to replace the old leaking rear main seal in your 1989-2007 Dodge 5.9L Cummins. It seems to be the rear main seal as its leaking from the bell housing and is dark. I checked the oil level and it was still at the full mark which had me a bit confused based on the oil that had been dripping out. Exhaust manifold leak (low turbo boost) Buy 12 Valve Cummins Exhaust. Sure enough, the first drips were coming out of the weep hole in the bottom of the trans bellhousing. I cleaned things up underneath and put some UV dye in the oil. When I got back home, I noticed a good sploch of oil under the truck. I never had this issue before and then just last week went on a 500-600 mile trip with the truck. I seem to have developed a leak in my rear main seal.
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