Question about 1987 Jeep Cherokee

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Oil leaks 87 jeep cherokee pioneer. not sure where the leak is coming from now. just changed out the valve cover gasket. still leaks. looks like from the front of the oil pan. can i change out the rear main seal from inside the oil pan without dropping the trainy

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  • waylon68 Mar 05, 2009

    Is there a way to tell if its the oil pan gasket versus the rear main seal. other than just dropping the pan and changing it.(which probably couldnt hurt). what are your feelings on some of the additives that are supposed to stop leaks. can they harm the engine.

    thanks for your help. just bought this jeep for $800 and trying to fix it up for my daughter.


  • waylon68 Mar 05, 2009

    Thanks. I think i will try the gasket 1st and some addidtive and see what happens. it leaks at the front of the trainy drain pan.

  • Anonymous Mar 24, 2014

    How much is this job cost. can I do it myself? does the tranny get dropped or engine taken out or just oil pan dropped

  • Anonymous Mar 24, 2014

    how much does it cost. Can I do of myself. Does the tranny get dropped. Or engine pulled or just oil pan dropped.

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Clean off the area where you suspect the leak is then run and check. The only way to change rear main seal (and have it actually work) is by removing crankshaft. I have seen this attempted at least a hundred times and never seen one yet that didn't leak. Some of the new oils for "older engines" have a seal softener in them tha usually will help but don't expect results for months...it took years for seals to harden & wear.

Posted on Mar 05, 2009

  • Richard Scordino Mar 05, 2009

    Generally rear main seal leak will drip from inside the bellhousing, pan will drip from outside. Over the years, I've personally tried a good number of additives, with results ranging from one that caused the lifters to pump up so high they blew the internal plunger retainers right out of them, to ones that had so much "cleaning" agent in them that just about every piece of carbon and gunk got loosened up and completely plugged up the oil pump screen. About the only product that I've found to be relatively reliable is that made by Lucas. Used in conjunction with any of the "high mile" engine oils, it does work, but if you have a large leak, it probably won't help. As I noted before, it took a long time for the seals to harden & wear...nothing will reverse that overnight.Also, make sure your crancase ventilation system is working properly. If plugged, engine internal pressure can drive oil past seals.

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