srmitchell
NAXJA Forum User
- Location
- Mckinleyville (Humboldt) CA
My jeep has 146,000 miles. 01, 4.0L, aw4.
It leaks oil.
I've thought it was the rear main seal, and not the pan, or oil filter adapter. Im running Mobil 1 10w30
I pressure washed today, and sure enough, it seems to be leaking from the rear main seal only, and enough to cover the tranny in oil.
Here's the question.
Who do I believe? I took it to two shops today. One was a jeep specialist. One was not. I want to do the work my self, but I need to know what they wanted to do.
The jeep specialist said- It's the main seal, and because I'm using Mobil 1, it's leaking out. He says Mobil 1 is such good oil, that it leaks out through the big tolerances our motors have. He says, switch to a castrol 20w30, and it may slow the leak a bit. He says it works better for the older technology. He quoted me 486 to do the whole replacement. He also freaked me out saying, if it's leaking, you might have a scored crank bearing. He says the rear mail seal is rare to go out.
The non-jeep shop said- It's leaking, but the mobil isn't the problem. The positive crank pressure pushes on the seal, stopping any type of oil you use. They quoted me $860 to do the whole job. They said that they have to pull the tranny. I lol'd and said, "no, it's a two piece seal, and you can pull the last bearing cap." The guy said, "Don't just pull one bearing cap. You'll stress the other caps, and you will have to re set the tolerances, using plasti-gauge, and you'll be pulling the bottom of the motor apart." Is this true? I see so many of us doing this in the driveway, but they want to pull out the tranny, and re build the crank!
Let me know what you think. I will be doing the work myself, but I just need to know if pulling the last cap is the "ok" method. And is mobil 1 to blame? Thanks!
-Sean
It leaks oil.
I've thought it was the rear main seal, and not the pan, or oil filter adapter. Im running Mobil 1 10w30
I pressure washed today, and sure enough, it seems to be leaking from the rear main seal only, and enough to cover the tranny in oil.
Here's the question.
Who do I believe? I took it to two shops today. One was a jeep specialist. One was not. I want to do the work my self, but I need to know what they wanted to do.
The jeep specialist said- It's the main seal, and because I'm using Mobil 1, it's leaking out. He says Mobil 1 is such good oil, that it leaks out through the big tolerances our motors have. He says, switch to a castrol 20w30, and it may slow the leak a bit. He says it works better for the older technology. He quoted me 486 to do the whole replacement. He also freaked me out saying, if it's leaking, you might have a scored crank bearing. He says the rear mail seal is rare to go out.
The non-jeep shop said- It's leaking, but the mobil isn't the problem. The positive crank pressure pushes on the seal, stopping any type of oil you use. They quoted me $860 to do the whole job. They said that they have to pull the tranny. I lol'd and said, "no, it's a two piece seal, and you can pull the last bearing cap." The guy said, "Don't just pull one bearing cap. You'll stress the other caps, and you will have to re set the tolerances, using plasti-gauge, and you'll be pulling the bottom of the motor apart." Is this true? I see so many of us doing this in the driveway, but they want to pull out the tranny, and re build the crank!
Let me know what you think. I will be doing the work myself, but I just need to know if pulling the last cap is the "ok" method. And is mobil 1 to blame? Thanks!
-Sean