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Old 06-28-2013, 12:56 PM   #1
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Oil Leak and High Pressure after Change

So Monday I bought a 1991 Wrangler. Everything seemed ot be working fine and it didn't actively drip oil but there was oil on top of the valve cover. The oil pressure gauge was always around 40 but it did fluctuate a bit. I checked the oil and it was a little low so I decided to go ahead and change it. I drained it and used 6 quarts of 10w30 and a mobile one filter. After the oil change it seemingly runs better and has less noise but the oil pressure gauge stays pegged at the max and now there is more oil on the valve cover and it seems to be leaking oil from the rear main seal and or the valve cover. I'm debating if I should just go ahead and replace the rms, valve cover gasket, and the oil pan gasket. I've read the pressure gauges are notoriously inaccurate and fail but mine appeared to work before I did the oil change.

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Old 06-28-2013, 01:19 PM   #2
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Check the oil level may be pushing a little. Remember when chasing an oil leak you are going to have two things that make oil move in the engine bay. First gravity so an upper leak will show as drips down lower. Two is the air flow in the engine bay it may not be where it is dripping from you may have to look foreward.

The valve cover and PCV/CCV and oil cap are notorious for leaking so start with the small easy stuff before you head under for a RMS that is still good.

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Old 06-28-2013, 01:25 PM   #3
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Check the oil level may be pushing a little. Remember when chasing an oil leak you are going to have two things that make oil move in the engine bay. First gravity so an upper leak will show as drips down lower. Two is the air flow in the engine bay it may not be where it is dripping from you may have to look foreward.

The valve cover and PCV/CCV and oil cap are notorious for leaking so start with the small easy stuff before you head under for a RMS that is still good.
I checked the level and its right where it should be. Tomorrow I plan to use a bicycle innertube and seal the oil cap. I'm assuming its a RMS simply because most of the oil is south of the transmission on the transmission and oil pan. When I get a chance tomorrow I'll clean it off and see if I can pinpoint the leak. I'll check the PCV/CCV also, didn't think to do that.
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Old 06-28-2013, 01:34 PM   #4
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I checked the level and its right where it should be. Tomorrow I plan to use a bicycle innertube and seal the oil cap. I'm assuming its a RMS simply because most of the oil is south of the transmission on the transmission and oil pan. When I get a chance tomorrow I'll clean it off and see if I can pinpoint the leak. I'll check the PCV/CCV also, didn't think to do that.
What kind of 10w/30 did you use? Synthetic on conventional?
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Old 06-28-2013, 03:40 PM   #5
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I am guessing you used synthetic. That is why they say not to switch. It is exactly what will happen to a high mileage motor always run on conventional that you switch to synthetic. Synthetic will seep places oil never seeped before.
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Old 06-28-2013, 04:14 PM   #6
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So Monday I bought a 1991 Wrangler. Everything seemed ot be working fine and it didn't actively drip oil but there was oil on top of the valve cover. The oil pressure gauge was always around 40 but it did fluctuate a bit. I checked the oil and it was a little low so I decided to go ahead and change it. I drained it and used 6 quarts of 10w30 and a mobile one filter. After the oil change it seemingly runs better and has less noise but the oil pressure gauge stays pegged at the max and now there is more oil on the valve cover and it seems to be leaking oil from the rear main seal and or the valve cover. I'm debating if I should just go ahead and replace the rms, valve cover gasket, and the oil pan gasket. I've read the pressure gauges are notoriously inaccurate and fail but mine appeared to work before I did the oil change.
Have you checked the pressure sending unit? Very common to damage the sensor when changing the filter and could cause these symptoms.
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Old 06-28-2013, 11:51 PM   #7
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What kind of 10w/30 did you use? Synthetic on conventional?
I used valvoline conventional.

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Have you checked the pressure sending unit? Very common to damage the sensor when changing the filter and could cause these symptoms.
I haven't checked that, I was less worried about the sensor/gauge then the fact its leaking alot more now. Part of me wonders if there wasn't enough oil for it to leak that much before. I'm assuming the sensor/gauge is faulty because it's pegged even if the motor is off but the ignition is on.
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Old 06-29-2013, 12:34 AM   #8
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I used valvoline conventional.

I haven't checked that, I was less worried about the sensor/gauge then the fact its leaking alot more now. Part of me wonders if there wasn't enough oil for it to leak that much before. I'm assuming the sensor/gauge is faulty because it's pegged even if the motor is off but the ignition is on.
They can get cracked to and you have a lot of oil pressure at that switch! It's worth looking at because its $8 part and if that's the fix, COOL!
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Old 06-29-2013, 04:08 AM   #9
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If your pressure is pegged then you have a problem with the sensor. could have popped off from increased pressure/cracked. or anything like that. even if the pressure was really that high there would probably be some fluctuation, but they read full pressure if disconnected or broken.
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Old 06-29-2013, 09:30 AM   #10
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I'll check the sensor as soon as it stops raining here.
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Old 06-29-2013, 12:39 PM   #11
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I got the sensor working again, it wasn't fully plugged in. I also went and used an innertube which sealed up the filler cap very well. Some of the bolts on the back of the valve cover were pretty loose so I tightened them all up. I cleaned up around the back so if it still leaks I should be able to better see where it is coming from.
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Old 06-29-2013, 02:22 PM   #12
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Nice let us know how it goes
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Old 06-30-2013, 04:37 PM   #13
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I'm thinking the cap and tightening the valve cover fixed it. I haven't seen any more oil dripping yet.

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