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Unread 04-18-2013, 08:10 PM   #16
Foundrydude
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1995 ZJ 
 
Join Date: Jan 2011
Location: Flatsville, IA
Posts: 2,692
Hot oil doesn't run in a stream like water. It flattens out and runs across entire surfaces, and reforms as a drip at the bottom

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Unread 04-18-2013, 11:37 PM   #17
Candymancan
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1998 ZJ 
 
Join Date: Aug 2010
Location: Virginia
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You have a rear main seal leak, which probly 99% of all ZJ's have.. Some can be really bad.. Some can drip maybe 1 or 2 drops every night, some drip maybe 1 drop every few days... My mom's 4.0 is the 1-2 per night dripper, my 5.9 drips maybe 1 every 24 hours...

Its deff nothing to worry about unless its leaking like a faucet and covering the pavement.. If its a slow drip like i mention its not even enough to change the oil level before your next oil change.. In other words ignore it... unless youre anal about it.. That bolt btw is just a bolt that bolts the inspection plate on the transmission.. Meaning that silver metal plate you see between the oil pan and tranny can be removed by unbolting it so you can check out the flex plate
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Unread 04-19-2013, 04:27 PM   #18
JohnC7
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1997 ZJ 
 
Join Date: Jun 2012
Location: Nanaimo, BC - British Columbia
Posts: 278
Quote:
Originally Posted by Candymancan
You have a rear main seal leak, which probly 99% of all ZJ's have.. Some can be really bad.. Some can drip maybe 1 or 2 drops every night, some drip maybe 1 drop every few days... My mom's 4.0 is the 1-2 per night dripper, my 5.9 drips maybe 1 every 24 hours...

Its deff nothing to worry about unless its leaking like a faucet and covering the pavement.. If its a slow drip like i mention its not even enough to change the oil level before your next oil change.. In other words ignore it... unless youre anal about it.. That bolt btw is just a bolt that bolts the inspection plate on the transmission.. Meaning that silver metal plate you see between the oil pan and tranny can be removed by unbolting it so you can check out the flex plate
Thanks candyman for explaining that plate to me. The oil drip isn't bad at all. The oil level isn't going down, so the drip isn't a huge thing for me at the moment and will probably replace the seal when I change the oil.

Yesterday I did take a pressure washer to the inspection plate an also crawl under and clean all the gunk under there to see if I can get a drip line going. I crawled under today and saw no drip line from the upper part where the main seal is. The pooling is mainly from that bolt.

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Unread 04-20-2013, 08:13 AM   #19
shaban
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1996 ZJ 
 
Join Date: May 2012
Location: Yarraville, VIC, AU
Posts: 413
Mine was leaking exactly like that. Turned out it was an oil adapter filter seeping oil, which was then going along the oil sump gasket and somehow leaking through inside the bell housing and ending up on that bolt.

check that yourself - put some extra oil/degreaser to where the oil filter adapter sits, and see where it ends up in a couple hours.

You can also double-check the rear main seal leak by taking the removable dust shield section out of bell housing and looking at the flywheel. If it's oily, you've got a main seal leak. If not, its not.
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Unread 05-01-2013, 04:36 PM   #20
JohnC7
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1997 ZJ 
 
Join Date: Jun 2012
Location: Nanaimo, BC - British Columbia
Posts: 278
Quote:
Originally Posted by shaban View Post
Mine was leaking exactly like that. Turned out it was an oil adapter filter seeping oil, which was then going along the oil sump gasket and somehow leaking through inside the bell housing and ending up on that bolt.

check that yourself - put some extra oil/degreaser to where the oil filter adapter sits, and see where it ends up in a couple hours.

You can also double-check the rear main seal leak by taking the removable dust shield section out of bell housing and looking at the flywheel. If it's oily, you've got a main seal leak. If not, its not.
How do I take off that dust shield?
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Unread 05-01-2013, 09:43 PM   #21
Raimundo
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1993 ZJ 
 
Join Date: Dec 2012
Location: Newark, nj
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Quote:
Originally Posted by JohnC7 View Post
So I finally have the oil drip issue. This actually started happening after doing an oil change. I started using mobil 1 synthetic (been using castrol synthetic for a year now), with mobil 1 filter. Noticed the drain plug had a little leak, it was already tight, leaking a little less now. The oil filter seems to be leaking from where the filter attaches to. Also a drip coming from a bolt that might be from the rear main seal.

I just want some confirmation of whats exactly leaking before I go and replace the rear main seal and o ring for the filter adapter. The dip stick isnt showing bad levels either, borderline safe and over full, so i'm not losing any oil really fast.

Also the jeep has 132,000 KMs

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"O" ring at the filter adapter. Rear crank shat seal. It happened to me. Also, if you can, start using Bosh filter 3406 I think it is.
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Unread 05-02-2013, 12:57 PM   #22
JohnC7
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1997 ZJ 
 
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Location: Nanaimo, BC - British Columbia
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Whats makes the bosch one differant?
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Unread 05-02-2013, 04:26 PM   #23
shaban
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1996 ZJ 
 
Join Date: May 2012
Location: Yarraville, VIC, AU
Posts: 413
To take the bellhousing shield off, undo 3 bolts. Two on bottom and one on the side where the exhaust is.
Not that you're going to see much anyway, but take a look at flex plate. If it's got oil all over it, it's the main seal, if not - something else.

Bosch filter can be screwed on without the oil adapter. So you can take off the oil adapter, remove the roll pin, unscrew the filter fitting from the adapter and put it right into the engine block. And then you can screw on the bosch filter right on without the adapter.

I just fixed mine adapter orings, cost me about 6 bucks on ebay plus some fiddling unscrewing the adapter.
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