If oil isn’t dripping from beneath your Jeep TJ’s inline-six, it’s because it’s either brand new or the rear main seal has actually been changed within the critical 40,000 miles. That’s just a fact of four-liter life. A leaking rear main seal (RMS) is virtually as common among TJs as a leaking valve covering gasket. Both space annoyances that leave the undercarriage a mess, and oily spots wherever the Jeep is parked.




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Oil seeping from around the back of the valve cover and also running under the behind of the engine block deserve to be easily stopped by either re-torqueing the valve covering bolts or removing and replacing the old gasket through a brand-new one. A leaking RMS, which commonly rears that is ugly head with leaking oil originating from in between the transmission and the engine, is a little an ext time consuming.


Fixing the leaking seal entails dropping the exhaust, oil pan, key bearing support bar, and rear main bearing, and then instead of the two-piece seal. It’s among those work that shops we job-related with typically charge at the very least a couple of hundred bucks. The good news is the doing the RMS repair yourself is relatively easy, and the expense can be less than $50 because that the seal and also sealants. The 6 quarts the oil and a new oil filter of course will add to that.


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It have the right to be excellent in a pair hours—providing the exhaust down-pipe bolts come out without break off. (Lube them well with penetrating oil the night before.) A an easy metric socket set, along with a good torque wrench and also a round-nosed punch, are the just tools required. You will require tubes of anaerobic (seals in the absence of air) sealant and also RTV sealant, though.


To discover how, follow follow me as Dunks performance (in Springfield, Oregon) techs replace the RMS top top a customer’s 2006 LJ. The 4.0L had just turned 57,000 miles and it had actually been seeping oil for six months. The owner of this TJ unlimited was having actually a new 4-inch suspension installed, which detailed the perfect chance to address the oil leak due to the fact that the prior axle assembly and also exhaust would already be conveniently out of the way, permitting easy accessibility to the oil pan.


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