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Unread 08-29-2014, 02:34 PM   #1
thefunkbassist
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Need help regarding oil leak in 1991 Jeep Wrangler

Hello, today I took the jeep out on the road for the first time and I noticed that there is an oil leak near the passenger side. I noticed it was dripping from the leaf spring on the passenger's side and that it there was oil on the base of the battery as well and the surrounding areas as well. There was one hose that had a good amount of oil on it and it is circled in red. What can the oil leak be from? This jeep is just headaches on top of headaches. help is much appreciated.


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Unread 08-29-2014, 02:41 PM   #2
mike134
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check the valve cover gasket first. put on some laboratory safety goggles and have a colleague step on the gas pedal to rev the RPMs. watch for shooting out oil.

You can also loosen all of the bolts on the valve cover and then retighten them in the correct sequence to the correct spec, this may help if they have rattled loose over the years. If this doesn't work, you'll need to replace the gasket if it is leaking (about a 1-2 hour job).

Keep chasing down the problems and then attack all of the basic maintenance issues and change all fluids, you'l have a reliable YJ in no time!

best of luck!
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Unread 08-29-2014, 02:46 PM   #3
Drednot
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You sure its oil?
That is a heater hose and about the only thing that would be leaking in that area would be coolant. Its fairly common to leak from the bottom of where that hose goes into the fire wall.
From the looks of it,(mesh sock, spring clamps) its the original hose from 1991. Time to change them out and clean off the drippings. NAPA carries those hoses with the "s" curves in them.
I just changed out mine last weekend. Mine were OE (original equipment) also.
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Unread 08-29-2014, 02:52 PM   #4
thefunkbassist
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Well the valve cover is nice and dry so I doubt the leak is coming from there and I am sure it is oil because of the color and smell. I also noted that there was a little pool of oil by the base of the dipstick. Is that a possible location? I also noticed that there was some blow by after seeing mist come out of the dipstick tube. I added Engine repair by Bar's to correct that. I have yet to clean the pcv valve.
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Unread 08-29-2014, 03:22 PM   #5
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Quote:
Originally Posted by thefunkbassist View Post
Well the valve cover is nice and dry so I doubt the leak is coming from there and I am sure it is oil because of the color and smell. I also noted that there was a little pool of oil by the base of the dipstick. Is that a possible location? I also noticed that there was some blow by after seeing mist come out of the dipstick tube. I added Engine repair by Bar's to correct that. I have yet to clean the pcv valve.
Snake oil FTW!

The oil is coming from ..

a. Your dipstick base
b. Your distributor base (it has a seal in there)
c. Aliens
  1. Check for all 3
  2. effect a physical repair
  3. ???
  4. Enjoy
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Unread 08-29-2014, 03:34 PM   #6
mike134
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you see mist comming out of your dispstick tube? And it is not oil?
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Unread 08-29-2014, 03:43 PM   #7
Luuca
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Snake oil FTW!

The oil is coming from ..

a. Your dipstick base
b. Your distributor base (it has a seal in there)
c. Aliens
  1. Check for all 3
  2. effect a physical repair
  3. ???
  4. Enjoy
Adding one more location to check...
c. Your oil pressure sensor - on the block behind your alternator
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Unread 08-29-2014, 03:48 PM   #8
mike134
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Also, just for fun, give your oil filter a slight crank in the clockwise direction to make sure it is sealed up, but I doubt that's the problem.

There are only so many places it can be comming from... Its in your battery tray and really high up on that coolant hose and I see RTV splooging out of your valve cover all over the place which tells me that it wasn't a real gasket.
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Unread 08-29-2014, 04:02 PM   #9
Reno72
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My guess is oil pressure sending unit. It will leak when the motors running and the wind while driving will spray it all over but the biggest puddle will be on the passenger side.
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Unread 08-29-2014, 04:26 PM   #10
140mower
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Quote:
My guess is oil pressure sending unit. It will leak when the motors running and the wind while driving will spray it all over but the biggest puddle will be on the passenger side.
^^^^^^^ This is my guess as well...... It doesn't take a lot of oil to make a big mess either...
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Unread 08-29-2014, 07:22 PM   #11
thefunkbassist
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where is the oil pressure sending unit and how does it look like? and might overfilling the engine with oil have caused this problem?
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Unread 08-29-2014, 07:44 PM   #12
Luuca
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Quote:
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Adding one more location to check...
c. Your oil pressure sensor - on the block behind your alternator
Quote:
Originally Posted by thefunkbassist View Post
where is the oil pressure sending unit and how does it look like? and might overfilling the engine with oil have caused this problem?
looks like a brass or aluminum cylinder with a wire on top
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Unread 08-29-2014, 08:00 PM   #13
thefunkbassist
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Alrighty, for the oil pressure sending unit, how would you remove it? do I need to drain the new oil I put in? any special tools required? difficulty?
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Unread 08-29-2014, 08:17 PM   #14
boostedsvo
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I haven't messed with the sending unit on a jeep yet, but on my mustang it's a breeze to replace. All that's needed is a set a wrenches; just find the one that fits on the base and take it out like a bolt. Just do it when it's cool so you don't burn your hand on the block and no need to drain the oil. Maybe put a little bit of teflon thread sealant/wrap on the new one for good measure.
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Unread 08-29-2014, 08:30 PM   #15
Luuca
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Originally Posted by thefunkbassist View Post
Alrighty, for the oil pressure sending unit, how would you remove it? do I need to drain the new oil I put in? any special tools required? difficulty?
First tool you'll need is a Jeep Service Manual, not a Chiltons, but an actual FSM

http://www.thejeep.com/orgman.html
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