Where should I be looking for this leak? - JeepForum.com

 
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post #1 of 12 Old 05-06-2010, 07:20 PM Thread Starter
paxcrunner
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1988 YJ Wrangler 
 
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Where should I be looking for this leak?

Ok, so I changed my oil today and noticed for the first time that there is what looks like a coating of oil across the back half of my YJ, but it doesnt seem to be coming from anywhere? Ideas? Ive included pics

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post #2 of 12 Old 05-06-2010, 07:30 PM
jaycal3
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I am guessing your rear output shaft seal is leaking... the seal in the first picture to the transfer case looks worn and old. Its spinning fluid everywhere off the driveshaft.

Pick up a new one for a few bucks and pop it in - its an easy job.

93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.

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Last edited by jaycal3; 05-06-2010 at 07:32 PM. Reason: added thought
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post #3 of 12 Old 05-06-2010, 07:31 PM
K4KAS
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Oil leak getting blown from driving?
Spilling something in the interior and it coming out of a drain plug? Possibilities are endless really!
Get more pictures focusing on where it possibly starts or where the most abundant of the substance is located.
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post #4 of 12 Old 05-06-2010, 07:33 PM Thread Starter
paxcrunner
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I will take more pictures tomorrow when it is light out. JayCal, that does sound about the area where it is. Whatever it may be its definitely a small leak, I checked the oil level before I changed it, and it didn't need any.
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post #5 of 12 Old 05-06-2010, 07:36 PM
jaycal3
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I dont think its oil - not in the rear... that little seal leaks and spins ATF everywhere. Check your ATF level on the fill plug of the transfer case... if its leaking its a small amount at a time - when you park overnight put a piece of cardboard down under the rear driveshaft and see in the am if you have a spot - it would be reddish in color.

93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.

Do your part for Leukemia research - help find a cure.
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post #6 of 12 Old 05-06-2010, 07:39 PM
cbmadcow
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Quote:
Originally Posted by jaycal3 View Post
I am guessing your rear output shaft seal is leaking... the seal in the first picture to the transfer case looks worn and old. Its spinning fluid everywhere off the driveshaft.

Pick up a new one for a few bucks and pop it in - its an easy job.
I agree about the transfer case. Replace that output seal refill the TC.

Kevin

1993 Jeep Wrangler lifted YJ
Previous Jeep 1998 TJ
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post #7 of 12 Old 05-06-2010, 07:41 PM Thread Starter
paxcrunner
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Ahh, I gotcha. I'll have to do it when the wind dies down here, no way anything is going to stay in one place tonight. It is probably the original seal from 88, so I wouldn't doubt it needing to be replaced.
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post #8 of 12 Old 05-06-2010, 07:50 PM
samsonitesamson
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Looks exactly like my jeep... I have just been to lazy to change out the $5 seal..... Ill get to it one of these days.... or just do a SYE

When thou walkest through the fire, thou shalt not be burned; neither shall the flame kindle upon thee ~ Isaiah 43:2 ~



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it bolted right up, except one bolt but i didn't need it anyway
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post #9 of 12 Old 05-06-2010, 07:55 PM
yjmoose
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On my jeep, after I replaced that seal, it still leaked from there. I found out that the yoke that goes into to the t-case has a metal plug (similar to a freeze plug) that was leaking on mine. I sealed it with some rtv and that completely eliminated the leak. So if after you replace the seal you still have a leak, you might want to check that.
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post #10 of 12 Old 05-06-2010, 07:57 PM Thread Starter
paxcrunner
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Thanks Moose
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post #11 of 12 Old 05-06-2010, 08:02 PM
Burnerman
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My Jeep did that even after I replaced the seal and bushing in the tail. I found out that the slip yoke has a small hole in it between the ears of the yoke. When you pull the D/S to replace the seal check for a tiny hole in the metal cap between the yokes of the slip part of the D/S. It always slung a bit of atf all over and the bottom of my Jeep looked just like your pic. Never enough to drip on the ground. Never had to add any atf to the tcase between yearly oil changes. I considered it rustproofing! my new D/S has no hole and no leaks...
OOPS to late! LOL..

96 ZJ.
05' Grand Cherokee Limited, 2"OME lift
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post #12 of 12 Old 05-06-2010, 08:06 PM Thread Starter
paxcrunner
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I'm going to check the levels tomorrow, then clean out the garage so I can get to work. Gravel is hard on the back
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