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Unread 05-06-2013, 06:54 AM   #1
xxxxxxxxranger_1999
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1998 ZJ 
 
Join Date: Mar 2011
Location: Forest City, NC
Posts: 515
coolant leak from oil pan, help?

Okay here's the ordeal. If i leave my jeep for a few days without driving, say 2 or 3 days, i will start to have coolant leaking down the oil pan from what looks like the bottom of the crankshaft pulley.

I cant actually tell where its coming from, i can only see in a limited space. Its not a horrible drip, but a small puddle every few days of not driving.

I replaced my waterpump and t stat before Christmas. I used RTV on the seals as well. im not ruling those out, but i cant see the bottom of the waterpump to actually tell or not.

Someone mentioned a freeze plug? but i would like more input if possible.

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Unread 05-06-2013, 07:22 AM   #2
Uniblurb
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Location: Central, Ohio
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When you installed the new water pump did you clean all the gasket/dirt off of the bottom mating surface super good where the oil/grime accumulates above the timing chain cover? Did you install a new water pump inlet tube as can be seen in the below link or just use the old one? Sometimes the old ones are hard to seal correctly and can leak. Also make sure your hoses are tight.

http://shop.advanceautoparts.com/web...ater+pump+tube

While you can't see exactly where the bottom of the pump meets the block look to see if the coolant may be coming out of the weep hole which would indicate a faulty pump.

Most likely wouldn't be a freeze out plug since they're on the sides of the block. And since the T-stat is in full view on the front of the 4.0 you should be able to see if it's leaking. Good luck.
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-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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Unread 05-06-2013, 07:25 AM   #3
xxxxxxxxranger_1999
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1998 ZJ 
 
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thank you, yes i did clean the opening well, chisled the old gasket off and used acetone on a rag and cleaned the whole area well. unfortunately i had to use the old hose inlet tube, as the were out of stock for new one. I guess ill just pull the fan off and take a closer look.
Thank you..

although i find it odd it doesnt leak after i drive it. Its just after 2 days or more of sitting.
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Unread 05-06-2013, 08:00 AM   #4
Uniblurb
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YW and if you can remove the fan clean everything off with spray brake cleaner then you may be able to see where the coolant is coming from after sitting. They also sell a UV marker you can use or eventually the coolant should leave a trail/residue where it's leaking.

I've also had to use the old inlet tube on new/rebuilt pumps before and supposedly on some there's an o-ring down in the port which needs replaced. But after putting gasket sealer on the threads it seems like they don't always bottom out but haven't had them leak after doing this. And I do use gasket sealer (Ultra Black) rather than regular RTV on any coolant mating surfaces even with a water pump gasket.
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96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)

-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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Unread 05-06-2013, 11:53 AM   #5
dellis
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1998 ZJ 
 
Join Date: Feb 2013
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I had a small leak that looked like it was beading off the oil pan at the front, and I assumed it was the water pump ... replaced the water pump, but the leak continued.

It turned out to be the top radiator hose had a small pin-hole. I discovered it by moving it around while the car was hot.
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Unread 05-06-2013, 11:56 AM   #6
PolkaPower
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How about the coolant bypass hose?
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Unread 05-06-2013, 01:27 PM   #7
xxxxxxxxranger_1999
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Ok thanks. Ill check more thoroughly
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Unread 05-07-2013, 05:31 AM   #8
shaban
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1996 ZJ 
 
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Mine's doing that, but it sort of weeps from thermostat housing gasket, then drips on the pump and all the way down to the sump.
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