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Old 03-29-2016, 01:07 PM
Thread Starter
Join Date: Mar 2016
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Oil leak

Hoping someone can help me out! 1999 4.0 Sport 309,000mi. Husband is wanting me to get rid of the old girl...no way! I do know enough to talk the talk, assisted in repairs but never on my own. I have developed minor oil leak or maybe leaks, does not smell like trans/rear end. Problem is I am at a stand off with hubby, he figures if he doesn't fix I will sell her. Seems as tough the leak is coming from somewhere on top end, so much blow back I don't know where to begin to look. Also, seems I'm getting loss of power on steep uphill climbs. Any suggestions on where to look?

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Old 03-29-2016, 01:10 PM   #2
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I would clean engine first maybe at a car wash ,once clean it might be easier to see where it is coming from good luck

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Old 03-29-2016, 03:48 PM   #3
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Most likely either rear main seal or valve cover is leaking or as it was in my case both.
1999 TJ Sport, 4.0 Auto, 3-1/4" RC lift, 33" BFG AT, D44 rear D30 front 373 gears, Bilstein shocks, JKS frt trackbar, JKS frt disconnects, Bestop tire carrier.
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Old 04-03-2016, 06:54 AM   #4
Join Date: Apr 2016
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The 3 most common places are:
1. The rear main seal is the most common leak. (takes 2 - 4 hours to fix)
2. the front main seal - less common (takes 2 - 3 hours to fix)
3. rocker cover - fairly common, but really easy to fix(30 - 60 minutes)
All Parts are really cheap.
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Old 04-04-2016, 09:00 AM   #5
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mine has a rear main seal leak (small) and oil pan gasket leak. check in those areas im sure
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Old 04-04-2016, 09:17 AM   #6
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You can post pics here but rear main seal seems to be the most common leak on TJs but could be likely be something a simple as a valve cover leak. Those bolts tend to loosen over time and will cause leaks and can be lessen or eliminated by simply tightening the bolts. Just needs to be snug because valve cover bolts only calls for about 50 in/lbs of torque.

Your husband has to understand most vehicles will develop leaks once it's aged. I've seen them on vehicles with 1/4 of your mileage and definitely not a reason to sell it if mechanically sound and paid off.
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Old 04-05-2016, 07:31 PM
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Join Date: Mar 2016
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Realized I was a bit vague in my question. Attached a pic(I think- took forever to attach) Rear main was replaced at about 250,000 The majority of oil is under what I believe is the master cylinder, but it appears there is no leak from the hose itself. A bit of oil on the valve covers but could be blow by Anyone know a decent mechanic in Fort Collins, CO? Someone that won't try to BS a female!
Thanks for the help guys!
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