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Bad oil leak on 4.0 please help!

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Old Feb 5, 2019 | 11:11 AM
  #16  
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Note that those 2 elbows are NOT the same part - one of them has a much smaller hole than the other. Make sure that the right one is at the right location.

I'm actually about to do the valve cover myself (with the fel-pro pictured) and bought all new elbows and grommets for the valve cover - The current VCG leaks a bit, maybe 1/2 a quart/3k miles.
It was leaking worse before I realized that a few of my valve cover bolts towards the rear of the engine were super loose. I snugged them down just enough to not be able to turn them by hand (not having the torque specs in front of me and knowing I'd be changing the gasket soon) and it helped "slow the flow" until I can get a chance to do the gasket.

Edit -- If you're buying one of the Fel-pro gaskets pictured, make sure the part number is correct for your vehicle. The box for the one I got for my 95 appeared to only go up to 95... now this could be bunk, I haven't double checked anything myself, but I feel it should be mentioned.

It goes without saying, so I'll say it anyway -- don't run the engine with only 3 quarts of oil in it! It takes 6, so keep it in the 5-6 range to avoid excessive engine wear.

Last edited by PatHenry; Feb 5, 2019 at 11:15 AM.
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Old Feb 5, 2019 | 12:44 PM
  #17  
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Originally Posted by gat
It is very easy to remove the two screws on the distributor cap and look for oil under it. There should be none. Asking as you are there make sure that the rotor and cap don't have much wear on their contacts. There is no need to pull any of the spark plugs' wires for this. At most just pull the middle wire to the coil.
i literally just replaced the cap, rotor, and plugs last week on my day off work
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Old Feb 5, 2019 | 12:47 PM
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Originally Posted by gw204
The 4.0 doesn't have a PCV. The CCV elbows on top the valve cover and just that...elbows. The forward one that routes to the airbox isn't metered, but I believe the rear one that goes to the intake is. Clean the oil off, inspect the stock CCV parts (check that the elbows and lines aren't blocked), put them back on if good and see if it still leaks.

If you put a non-stock pcv valve on there that's probably caused the problem.
the pcv i bought said it was for a 4.0 chrysler/jeep/dodge il find my reciept and check part numbers
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Old Feb 5, 2019 | 12:52 PM
  #19  
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Originally Posted by Desertsandxj96
the pcv i bought said it was for a 4.0 chrysler/jeep/dodge il find my reciept and check part numbers
There are 2 elbows. Did the old one that came off match the new one that went on? It's a pretty big difference, one is basically a hollow tube, the other has a very small hole at the base, so provided it looked pretty much the same, you should be good. (In other words, it's very obvious which one matches and which does not.)
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Old Feb 5, 2019 | 01:00 PM
  #20  
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Looks like the back (rear of engine to intake manifole) one is the "with orafice" (aka, the little hole) and the front one (to the air filter box) is the plain old tube.
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Old Feb 5, 2019 | 02:32 PM
  #21  
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I put a breather on the front, stock pcv or ccv on the back, both needed new grommets on the valve cover as well
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Old Feb 5, 2019 | 02:45 PM
  #22  
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Hahahaha - nice!
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Old Feb 5, 2019 | 02:47 PM
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This is what O'Reilly's computer system said the pcv was...

Does this look like the right one?
there is a little amount of oil on the back part of the valve cover behind this little bastard
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Old Feb 5, 2019 | 03:40 PM
  #24  
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Had the ol lady crawl under it with her eyes, she said it was coming from the oil filter i put on last week when i changed the oil, checked the gasket it looked fine but had some seepage, now back to O'reallys to get a wix filter and pcv tube since it broke coming off, and some gaskets... valve cover wasnt leaking thank God since its the more expensive one
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Old Feb 5, 2019 | 04:14 PM
  #25  
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Originally Posted by Desertsandxj96
she said it was coming from the oil filter i put on last week when i changed the oi
Make sure you get the correct part number filter.

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Old Feb 5, 2019 | 04:29 PM
  #26  
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Originally Posted by Desertsandxj96
Had the ol lady crawl under it with her eyes, she said it was coming from the oil filter i put on last week when i changed the oil, checked the gasket it looked fine but had some seepage, now back to O'reallys to get a wix filter and pcv tube since it broke coming off, and some gaskets... valve cover wasnt leaking thank God since its the more expensive one
If a new WIX filter (my 95 runs awesome on WIX) doesn't cure the issue, it could be the adapter o-rings. Super common issue on these older trucks. A new set of o-rings is pretty cheap, the trouble is getting the old part off - it's a T-55 torx bolt IIRC and you have to destroy a socket to get just the bit - then it's a tight spot. Someone suggested a serpentine belt tool worked well. I used a craftsman "max access" (spelling not correct) and a cheater to loosen it (with the torx bit out of a cheapo socket).

It is obviously right at the point on the engine that would appear to be the filter leaking - especially to those less familiar with the engine.

Do the filter first - can't go wrong with WIX - and go from there.
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Old Feb 5, 2019 | 04:33 PM
  #27  
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Originally Posted by PatHenry
it could be the adapter o-rings. Super common issue on these older trucks.
This. When I had an oil leak it was these O-rings. One of them snapped in half when I took it all apart to replace them. Unfortunately for me I have an LPG evaporator right above the adapter which made mine even more of a
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Old Feb 5, 2019 | 05:28 PM
  #28  
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Just got the adaptor o-ring and gasket set... wish me luck!
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Old Feb 5, 2019 | 05:30 PM
  #29  
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Old Feb 5, 2019 | 05:59 PM
  #30  
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Good luck bro!

Boxburn --- ugggg... that thing was a pain enough without extra stuff in the way. How did you get it - underneath with a lot of swearing and beer breaks?
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