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Unread 07-29-2010, 05:31 PM   #1
thunderstar99
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1990 YJ Wrangler 
 
Join Date: Apr 2010
Location: Ft Campbell, KY
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Major Oil Leak

I was hoping someone here could help me out. I have a major oil leak on thre lower passenger side of the engine block. I wish I knew how to put a pic on here but will try to decribe it the best I can. There is a pipe(?) coming out and then it y's there is a black piece that sticks straight up toward the hood that has a single wire. The other side of the Y has another piece coming out and has two wires connected to it that is where my leak is located. I looked in the haynes manual and could find nothing. Stopped by Advance Auto Parts and they said that it was the oil pressure sensor. What they g=had looked like the piece sticking straight up to the hood. Any help would be greatly appreciated. I really need to get this fixed before I go to Afghanistan so the wife doesnt have to worry about it. Again thank you for your help
P.S. almost forgot 1990 4.2L I6

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Unread 07-29-2010, 08:45 PM   #2
laybackman
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Quote:
Originally Posted by thunderstar99 View Post
I was hoping someone here could help me out. I have a major oil leak on thre lower passenger side of the engine block. I wish I knew how to put a pic on here but will try to decribe it the best I can. There is a pipe(?) coming out and then it y's there is a black piece that sticks straight up toward the hood that has a single wire. The other side of the Y has another piece coming out and has two wires connected to it that is where my leak is located. I looked in the haynes manual and could find nothing. Stopped by Advance Auto Parts and they said that it was the oil pressure sensor. What they g=had looked like the piece sticking straight up to the hood. Any help would be greatly appreciated. I really need to get this fixed before I go to Afghanistan so the wife doesnt have to worry about it. Again thank you for your help
P.S. almost forgot 1990 4.2L I6
The one that is pointed up is the oil pressure sending unit. The one that points sideways is the oil pressure switch.

The OEM # I find for the OPSU is 5300 5218.
The OEM # I have for the OPS is J575 8695.

Good luck and keep safe!
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Unread 07-29-2010, 09:07 PM   #3
4LarXedo4
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Top right diagram sounds like what your describing, ^ like stated above sending unit and switch. Advance auto should have both I got both mine from there pretty cheap.
oilpsi.gif  
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Unread 07-29-2010, 09:48 PM   #4
thunderstar99
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Thank you for the reply. I am still figuring my jeep out and trying to learn as I go. I am really appreciative of all the help I have gotten on this forum. William
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Unread 07-30-2010, 07:30 AM   #5
laybackman
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You are welcomed! Forums work so well because many of us have some knowledge about some things to use or share.....but our significant others usually don't think we know crap about anything!
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Unread 08-30-2011, 01:28 PM   #6
Peanuts89yj
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i swear mine is leaking fro wher distributor mounts to motor. i it bubble there at cold start and drip spot is right below....was told it was sending unit or switch but diagram from above says otherwise. leak comes from above oil filter ..filter is new and leak was ther b4 oil change and with old filter. gy at valvoline told me to put a handfull of sawdust into the engine to "gum up" the leaks....sound like not a good idea. any thoughts on my leak? HELP! PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
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Unread 08-30-2011, 01:30 PM   #7
Andywear
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sawdust FTW
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Unread 08-30-2011, 01:48 PM   #8
Old4X
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Quote:
Originally Posted by Peanuts89yj View Post
i swear mine is leaking fro wher distributor mounts to motor. i it bubble there at cold start and drip spot is right below....was told it was sending unit or switch but diagram from above says otherwise. leak comes from above oil filter ..filter is new and leak was ther b4 oil change and with old filter. gy at valvoline told me to put a handfull of sawdust into the engine to "gum up" the leaks....sound like not a good idea. any thoughts on my leak? HELP! PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Therer is a gasket on the distributor flange. It could be broken or missing.

Check your PCV system. If it is working properly and you have the proper amount of vacuum (engine properly tuned), you should not be leaking there.
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Unread 08-30-2011, 08:28 PM   #9
bioman
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Check the distrib seal and if you still have the problem check the pcv. You may be pressuring your crank case a bit. But I think the distrib seal from what I hear.
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Unread 09-06-2011, 12:51 PM   #10
Peanuts89yj
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I also think I should mention that I dont think the vaccuum lines for the 4wd r hooked up. And the hose that comes off the air intake on the top of the head closest to the radiator, that fits loosely, looks like silicone dried and it cracked. Guy I bought from did the MPI kit w/ 4.2 block 4,0 HO head etc. never swapped tac to correct voltage so i have no tac. And honestly i have never needed to put it in 4wd. where I go in N.H. is dry and rocky, no real steep stuff.. And i am assuming if i had a spun bearing not letting oil pass it would pour out rear main seal at crank, not at dist seal. Working on my harley seems way easier...lol
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