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Old 11-19-2013, 07:03 PM   #1
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Blown seal??

Not sure what happened tonight... Driving home I noticed my oil pressure was higher than normal, then noticed a little smoke behind the jeep. As I drove the smoke got thicker, then tapered off after 15 mins and by the time I got home the oil pressure was beyond low, like non-existent. It looks like something blew underneath, lots of oil all over everything, it looks like it dripped onto the exhaust piping and that's what burned it. Also an oily film on the back of the jeep so I think it's safe to rule out that oil was getting into the cylinders.

Checked the oil when I got home, none on the dipstick.

I have a 4.2 w/ about 100k on the motor.

Any ideas?

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Old 11-19-2013, 07:24 PM   #2
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Rear main seal???

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Old 11-19-2013, 07:54 PM   #3
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Check the oil pan gasket too. I'm not sure what would go all of the sudden like that, or maybe something in the road punctured your oil pan, I'd crawl under there and start inspecting.
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Old 11-19-2013, 08:50 PM   #4
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Possible oil sending unit
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Old 11-19-2013, 08:54 PM   #5
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It's just ice cream....







Oh, wait. This isn't about that, is it?

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Old 11-20-2013, 02:03 PM   #6
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So what was it????
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Old 11-20-2013, 02:32 PM   #7
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Yep my guess would be the oil pressure sending unit let go. If it isn't that then check the oil filter seams and the gasket.
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Old 11-20-2013, 09:03 PM   #8
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Sorry fellas I'm going to get to it tomorrow, I'll let you know what I find.

How complex is it to replace the oil sending unit? I've already watched vids on doing the rear seal so might as well knock that out and the oil pan gasket while I'm down there. But like I said I'll see what I find and what needs to be done
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Old 11-20-2013, 10:30 PM   #9
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Just checked really quick, oil filter area is clean. Exhaust is covered in burned oil a few inches right of center and a few inches behind rear main seal area. Drained the oil, less than a quart came out. I'm perplexed that I can't find a hole big enough to drain 5 quarts of oil in 15 minutes...

I'm going to clean everything up tomorrow and fill with oil again and run it for a bit to see if I can locate the leak. Does anyone advise against doing that?

Thanks for the help
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Old 11-21-2013, 08:49 PM   #10
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Welp think I'm onto something...

Previous owner said they just replaced the starter. Looks like they didn't attach that bracket back on, so I'm guessing there's a break in those lines somewhere...

Good news is I probably don't have to drop the pan or replace the rear seal

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Old 11-21-2013, 09:06 PM   #11
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Annnd bingo.



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Is there a temporary fix to this before I get it fixed for good? Weather is supposed to be s****y tomorrow so I might need the jeep

Thanks for the input too guys, I was digging around the oil sender for clues and tracked it down, I would have never thought to look around there.
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Old 11-21-2013, 10:02 PM   #12
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You got plumbing solder and flux???

How about some magic in a bottle there is a ton of it in the shelf at the parts house or walmart. I just can't recall the name.
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Old 11-21-2013, 10:05 PM   #13
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Going with JB weld and a hoseclamp


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Old 11-21-2013, 10:40 PM   #14
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That's it
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Old 11-22-2013, 10:38 AM   #15
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Alright, patched the hole up. Filled with oil and changed the filter. Started it up.... found the real problem.

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Is that the oil sender? When I started it up the oil flowed right out.
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Old 11-22-2013, 11:24 AM   #16
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Looks like it. Oils sender is on the passenger side of engine just below and in front of dizzy.
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Old 11-22-2013, 12:42 PM   #17
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Yup, that would also explain the weird oil pressure before all the oil came out....
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Old 11-23-2013, 12:40 AM   #18
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So it looks like tomorrow AM I'm going to buy the oil sender and a deep socket to unscrew the old one and screw in the new one.

Does any oil come out once the old one is unscrewed?
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Old 11-23-2013, 12:53 AM   #19
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Nope. All the oil is down in the oil pan assuming you haven't run it in the previous half hour or so. Really easy job. Take you two minutes.

Do yourself a favor and buy a whole set of deep sockets. You will surely need another size if you keep wrenching.
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Old 11-24-2013, 09:35 PM   #20
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Thumbs up

Picked up new oil sender at Autozone, only $9. They wanted $39 at O'Reilly

I did have to buy a a socket for $8 too.

Drove down the street and back, oil pressure is good, no leaks... PROBLEM SOLVED!

For $45 I replaced the oil sender, got a deep socket I'll never use again, changed the oil, replaced the oil filter, and had a beer.

All in all a pretty good operation.

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