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Old December 15th, 2006, 09:17 PM   #1
phittie1100
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Default Motor trouble - Jeep 4.0

Blasted back to Flint from Metro Airport tonight at 75+, don't remember the engine feeling like it was any more tired than usual. Parked it, had a sandwich, went back out to get my bags and found a puddle underneath, maybe 1/2 quart of oil or so. Traced it back to the airbox - looks like oil blew back through the breather tube, soaked the filter and the rest either ran to the bottom of the airbox or out underneath the airbox cover. I got oil everywhere. 140k on the motor, has a chronic diesel-like knock and low oil pressure since I bought it at 118k, but doesn't blow smoke. Or at least it didn't.

Is there an easy fix for this, or is it time to start collecting parts to build a stroker?
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Old December 15th, 2006, 09:22 PM   #2
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Heh, do a search in Jeep Forums for blow-by or the diesel sound. There are many write ups about this. Some people will say that it is time to rebuild the engine, or some will say to change the CCV on top of the valve cover. I have had a little blow-by in my air filter and just got the CCV parts to see if this will work. Though, I haven't had the amount of blow-by you are talking about.

I also have the diesel engine sound, but hold a steady 30-40 psi at idle and 60 psi when running. For the time being, I'm planning on just living with the sound.
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Old December 15th, 2006, 10:25 PM   #3
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The diesel sound is normal, pretty much every 4.0 I've seen with a lot of miles on it does that. It's just a jeep thing.
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Old December 16th, 2006, 09:29 PM   #4
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That much oil sounds like you've got a lot of pressure inside the engine where its not supposed to be....are you or are you not burning oil now? I'd do what your going to do, make sure the simple stuff is working and not broke or plugged etc...if not, I'd guess at rings, but thats only a guess!

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Old December 16th, 2006, 10:34 PM   #5
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Quote:
Originally Posted by letitloose06 View Post
The diesel sound is normal, pretty much every 4.0 I've seen with a lot of miles on it does that. It's just a jeep thing.
It's not really "normal" but yes....many 4.0's do it. The cause is piston slap. The fix is redesigned pistons with teflon coated skirts.

There was a TSB out for that.

Oil in the filter...yea, lots of info on the net about that. I posted a while back about doing a top of the piston cleaning with motor flush to free up the rings. I'll see if I can find that.
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Old December 16th, 2006, 10:37 PM   #6
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Found it...

http://www.greatlakes4x4.com/showthr...lush#post93508
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Old December 17th, 2006, 12:46 PM   #7
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Thanks for the tip, Tim. I did some poking around on jeepforum.com and found someone with similar trouble. I replaced the whole CCV system - vacuum lines, PCV valve, everything except the breather tube that runs between the air box and the front opening on the valve cover. Total cost was a surprising $21 at Victor George (and yes I forgot to ask about the club/GL4x4 discount) plus a new air filter from Advance. Cleaned everything up, installed new parts (although it seems like air was moving through all of the old pieces and parts) and flogged it for a while, and no new oil on the filter. I have to travel a couple of days this week for work, we'll see if my $21 ten minute fix does it.
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Old December 17th, 2006, 08:57 PM   #8
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Tim is all that crap going to clog up my cat after I give the motor an enema? I reread it again this evening and I thinkI may go ahead and do it even though the cheap easy fix seems to be working.
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Old December 19th, 2006, 07:45 PM   #9
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Most times that you find oil in the airbox it's not ring blowby. It is usually a problem with the CCV.
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Old December 20th, 2006, 05:16 AM   #10
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ccv replacement parts seem to have fixed it so far.
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Old December 20th, 2006, 10:28 AM   #11
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Quote:
Originally Posted by letitloose06 View Post
The diesel sound is normal, pretty much every 4.0 I've seen with a lot of miles on it does that. It's just a jeep thing.
I think I understand, but I just want to make it clear in my head......

When you say "the diesel sound," do you mean the sounds of valves/tappets knocking or the dieseling effect as I turn off my motor?

I have 85K on my TJ (L6) and have that "ticking sound" especially when I'm in too low of a gear trying to accelerate.

it seems unlikely to have "Piston slap" at 80K.....although, I don't know how the previous owner drove and maintained it.

Thanks!
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Old December 20th, 2006, 09:15 PM   #12
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My noise comes from down low, probably piston slap. At idle, sounds like a Ford Powerstroke, only lacking a few hundred ft/lbs of torque.
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