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Old 02-02-2013, 03:47 PM   #1
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New oil leak

Can any body tell me about this oil leak that's coming from between these to parts. It's a 98 tj

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Old 02-02-2013, 04:10 PM   #2
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It might a rear main seal.

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Old 02-02-2013, 04:13 PM   #3
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It might be a rear main seal:-)
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Old 02-02-2013, 04:21 PM   #4
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It's leaking at the top in between
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Old 02-02-2013, 04:22 PM   #5
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It that a big job to replace the rear main seal?
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Old 02-02-2013, 04:24 PM   #6
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It's just marking its territory. Rear seal. Mines been like that for 2 yrs now
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Old 02-02-2013, 04:33 PM   #7
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It's just marking its territory. Rear seal. Mines been like that for 2 yrs now
So it's not a big deal? I am getting a vibration when I accelerate in low rpms. Is that from that rear main seal?
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Old 02-02-2013, 04:35 PM   #8
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So it's not a big deal? I am getting a vibration when I accelerate in low rpms. Is that from that rear main seal?
I know these are probably dumb questions but I just don't know and it's my only transportation
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Old 02-02-2013, 04:44 PM   #9
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it also could be your valve cover gasket
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Old 02-02-2013, 04:48 PM   #10
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So it's not a big deal? I am getting a vibration when I accelerate in low rpms. Is that from that rear main seal?
Thanks
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Old 02-02-2013, 05:14 PM   #11
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First, determine whether it is oil or transmission fluid. I had a leak there and assumed it was a rear main seal until I noticed its actually tranny fluid. Mine slowly leaks tranny fluid after its sat for a week.
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Old 02-02-2013, 07:39 PM   #12
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First, determine whether it is oil or transmission fluid. I had a leak there and assumed it was a rear main seal until I noticed its actually tranny fluid. Mine slowly leaks tranny fluid after its sat for a week.
It is oil and it seems to be coming off the left side
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Old 02-02-2013, 07:46 PM   #13
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Could be the rear main, but when the rear of the valve cover gasket leaks on the 4.0, it quite often runs down and drips there, exactly like a leaking rear main would appear. I've seen it more than a few times, my own Jeep included. And no, it won't cause a vibration.
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Old 02-02-2013, 07:50 PM   #14
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Well what could cause the vibration. It's when I swap from first to second and immediately a vibration occurred and the As I press the fuel it goes away
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Old 02-02-2013, 07:54 PM   #15
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The problem with diagnosing problems over the 'net, is that quite often wild ass guesses are thrown around, because a lot of times that's all people can do without seeing the Jeep in person. A lot of time and money can be wasted on wild ass guesses.
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Old 02-02-2013, 08:01 PM   #16
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Originally Posted by sdptrey View Post
it also could be your valve cover gasket
↑This
I just had to tighten the valve cover on mine again....
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Old 04-18-2014, 02:56 AM   #17
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yes determine that its a motor oil leak verses an atf leak. if so the best is to replace the valve cover gasket and then replace the engine pan gasket and rear main seal at the same time as well.
on the vibration most likely u joints on driveshaft and axles worn. do yourself a favor replace all the joints and do the front gear oil at the same time.
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Old 04-18-2014, 04:48 AM   #18
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Type "RMS" or "Rear Main Seal" or "Strange Oil Leak" or "What's This Leak under my TJ" or "Just Bought TJ and Have a Question" or "Why are there Oil Spots on my Driveway" then take two days off from work and read all of the posts on this over the years. After seeing what a PITA it is to fix, do like most of us and then say F&%k it, and ignore the problem!
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Old 04-18-2014, 06:09 AM   #19
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The problem with diagnosing problems over the 'net, is that quite often wild ass guesses are thrown around, because a lot of times that's all people can do without seeing the Jeep in person. A lot of time and money can be wasted on wild ass guesses.
Yep. So not sure how old your TJ is but it could be the harmonic balancer. With the engine running, take a look at it and see if the ring is wobbling. With the engine off, inspect the rubber between the ring and the base and looks for bad cracks, the ring being loose or evidence of slippage. They can slip and still not be loose. If you rev the engine some sitting still and have the same effect at a give rpm or sometimes during a change in rpm, up or down, could be a good indicator also. Good luck with it.
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Old 04-18-2014, 09:00 AM   #20
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That does not look like the rear main seal and whatever it is, it isn't bad. There isn't even a partial drop hanging from the bell housing. If you want to figure it out for sure, go to NAPA and get an $8 bottle of UV dye to add to your oil. Use a UV light after a few days of driving to see where the leak originates. I think you can rule out the rear main seal though. On how hard is it? On the 4.0L it is pretty easy. On the 4 cylinder motor the the transmission and flywheel need to be removed. But based on the picture, I think you can rule out the the rear main seal.
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Old 04-18-2014, 09:59 AM   #21
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So it's not a big deal? I am getting a vibration when I accelerate in low rpms. Is that from that rear main seal?
.

Those vibes are valve tappet damage, shift down, not a big deal unless you make it do it a lot. If so be prepared to wipe out your valve train.
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Old 04-18-2014, 11:26 AM   #22
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.

Those vibes are valve tappet damage, shift down, not a big deal unless you make it do it a lot. If so be prepared to wipe out your valve train.
What????
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Old 04-18-2014, 11:38 AM   #23
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I've always thought that vibrations were more often caused by an ineffective TC drop. or possibly issues with your U-joints cause by extra stress due to an ineffective TC drop. Did you add a TC drop with your lift? If yes, then you have a couple of options. SYE (slip yoke eliminator) which is a bit of a can of worms...though it's the best option. The other bit of advice I received was to just add some washers onto the TC drop bolts to lower it a bit more and ease some of the strain on your u-joints, I'm actually doing this to my jeep this weekend so we'll see if it relieves my vibration issues. Be sure you check your u-joints for play too while you are under there.

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