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Old 11-06-2010, 05:46 PM   #1
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I did a bad, bad thing...

Alrighty, so I got stuck in some muddy water today and was able to get out under my own power eventually. But a decent amount of water got into the crankcase. The engine did not hydro-lock. Ran a quick trail before I noticed anything was amiss...

I drained the oil, added new oil, filter, and some Seafoam to help chase out any remaining moisture, but here's the deal:

My Jeep ('99 4.0L w/ AX-15) now sounds like a diesel. Bad. At idle in the driveway the oil pressure sits at about 15psi. At idle when driving the oil pressure will drop to zero and the check guage light comes on. Driving down the road to test it out and the oil pressure is a max of oh....about 15psi according to the guage. But for the short bit I have driven it, the engine feels like it's running perfectly smooth...just sounds like a diesel. Except there's no Duramax under the hood.

I'm thinking/hoping maybe just the oil pump is fuxored, but I suspect it's quite a bit more than that. Probably lifters and/or bearings. Oil pump I can do. Beyond that and it's going to a shop.

Ideas?


And no more deep water for this TJ.

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Old 11-06-2010, 05:49 PM   #2
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We need pics. Was you girlfriend with you by chance????

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Old 11-06-2010, 05:50 PM   #3
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Lol, nope. hehehe
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Old 11-06-2010, 05:51 PM   #4
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What does the oil look like since you changed it?
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Old 11-06-2010, 05:55 PM   #5
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another dang chadwick
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Old 11-06-2010, 05:55 PM   #6
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Oil is clean. Not foamy, frothy, or like a milk shake but there is deffinately still some muddy water moving around through there. Looks about like another two oil changes would pull the rest of the water out.
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Old 11-06-2010, 05:55 PM   #7
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QUOTE=nick50471;862301]We need pics. Was you girlfriend with you by chance????[/QUOTE]

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Old 11-06-2010, 06:07 PM   #8
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Originally Posted by KeeblerKO View Post
Oil is clean. Not foamy, frothy, or like a milk shake but there is deffinately still some muddy water moving around through there. Looks about like another two oil changes would pull the rest of the water out.
how do you know? if oil isnt milky then there shouldnt be water in there?
your abnormal oil pressure could be due to a faulty gauge or sensor.
and you said it ran smoothly, but sound like a diesel? you need to be specific, is it making noise? what kind of noise?
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Old 11-06-2010, 06:17 PM   #9
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how do you know? if oil isnt milky then there shouldnt be water in there?
your abnormal oil pressure could be due to a faulty gauge or sensor.
and you said it ran smoothly, but sound like a diesel? you need to be specific, is it making noise? what kind of noise?
The oil is clean, but it has dark muddy water mixed in with it. When I first drained it I ran a quart of oil through with the drain plug out. The oil stream was clean with a thin stream of dark muddy water inside of it. Still looks like that, but a whole lot better.

...and the engine sounds like a diesel, mostly under acceleration. Like a really bad lifter. The sound is loudest at the bottom of the engine like it's the crankshaft making the noise.
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Old 11-06-2010, 06:18 PM   #10
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Quote:
Originally Posted by KeeblerKO View Post
Oil is clean. Not foamy, frothy, or like a milk shake but there is deffinately still some muddy water moving around through there. Looks about like another two oil changes would pull the rest of the water out.
Have you tried making sure all your motor electrical connections ?
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Old 11-06-2010, 06:43 PM   #11
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Gonna look into that now. Especially pulling the wire from the sending unit over night to let it air out. I'm about to check the bolts between the exhaust manifold and downpipe to rule out the possiblilty of a really bad exhaust leak and look around for any cracks on the manifold.
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Old 11-06-2010, 07:55 PM   #12
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The oil is clean, but it has dark muddy water mixed in with it. When I first drained it I ran a quart of oil through with the drain plug out. The oil stream was clean with a thin stream of dark muddy water inside of it. Still looks like that, but a whole lot better.

...and the engine sounds like a diesel, mostly under acceleration. Like a really bad lifter. The sound is loudest at the bottom of the engine like it's the crankshaft making the noise.
get a clear cup and collect some oil and let it sit see if it separates. I think its just old oil mixed with new oil.
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Old 11-06-2010, 08:08 PM   #13
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You need to pull off the oil pan and drop a few mains and rods bearing caps and check to see to see if there is any damage, water is never good in a oil system it will strip and damage moving parts. I would say you motor is damaged if you drove it xx miles after getting water in it and will need to be pulled, no oil pressure is bad news and when ever a oil light is on stop the motor fast as each min it runs could cost you extra $$$$ in the repair cost. Just a ideal next time you go off road take a extra filter and oil supply and change it after you think you got water in the motor.
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Old 11-06-2010, 09:57 PM   #14
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Yeah... it's deffinately coming from down low on the engine. Having browsed around the web I'm going to toss out a guess: rod bearing(s)


I guess I'll find out the damages (lol, a pun!) on Monday. Well....there goes that nest-egg I have left over from the Army.

On the plus side, I have had my eye on one of those ATK re-mans for a while. For...if....my engine... ever took a shit. Might just be cheaper to have one dropped in. We shall see.
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Old 11-06-2010, 10:08 PM   #15
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I've seen this before; you likely spun a bearing. Time to head to a professional to drop and mic everything out before proceeding. Trailer it over to the shop - don't drive it. If that's it, a few hundred will make it right again.
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Old 11-06-2010, 11:02 PM   #16
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Put in neutral and crank it up, hold the accelerator to the floor and let the rev limiter take over. You will know where your problem is within a few minutes!

















You have rod/ main bearing damage and most probably crankshaft damage- at the least. A reman motor is probably the cheapest way to go, and no time like the present to go to a stroker, or build one.
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Old 11-07-2010, 11:13 AM   #17
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Might get off easy...

I pulled into the yard this morning to wash the mud off before the tow to the shop tomorrow and the knock is a whole lot quieter--deffinately still there, though. Oil pressure reading was nice and good on the guage.

Engine doesn't sound like a Duramax anymore. Just sounds like a lifter starting to go bad.
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Old 11-07-2010, 01:15 PM   #18
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Low oil pressure and bad crank bearings go hand in hand.
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Old 11-07-2010, 02:34 PM   #19
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I can't help with your problem, but I was wondering why we didn't run across you yesterday.... I guess that explains it. Where did you find enough water at Interlake to suck any up?
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Old 11-07-2010, 05:15 PM   #20
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At this point change the oil again - and the filter.
Dive 100 miles, then oil and filter again.

It'll probably be OK.
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Old 11-07-2010, 05:23 PM   #21
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Every 4.0 i have owned or herd sounds like a diesel. But anyway i have herd of people putting ATF in there oil for a very short amount of time( like under 100 miles) ans it cleans the inside of the motor.Then they flush it out and put in new oil and filter.
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Old 11-07-2010, 05:31 PM   #22
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I can't help with your problem, but I was wondering why we didn't run across you yesterday.... I guess that explains it. Where did you find enough water at Interlake to suck any up?
Not the 64 entrance but the other one... CR 1200 I think it is. Anyhow there was a big mud puddle over there. Went through the regular puddle several times and then I eyeballed the two tracks through the bog looking part of it. I was testing out the new 4.56s and Lock Rights so I gave it a shot.

...made it half way and had to rock back and forth for a while to get freed up and back out.

Been through water that deep before (about 3 feet deep) and gotten stuck in stuff like that before without any problems like this. But no more Chadwicks for me.


I'll give the oil and filter another shot, rrich.
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Old 11-07-2010, 06:30 PM   #23
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Here's a quick video I just shot for the actual sound. For reference the camera is on the ground below the pitman arm.

You can kind of hear the rattle at start-up, but it's easier to hear in person. The two louder instances of the "marbles" is at 1500 RPM. At idle the rattle is there, but pretty quiet. Past 1500 and it seems to get quiet or is covered up by the engine. Engine temp does not affect the sound.

The engine still sounds just a touch rough (magnified by the audio and exhaust in the video), but is idling and feels to be running normally.


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Old 11-07-2010, 07:05 PM   #24
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Unfortunetly water is heavier than oil so the oil pump would have picked it right up. I just put an oil pump in mine and replaced the rod bearings as well. If you follow the oil flow diagram in the manual you know that the main bearings get oil first and then send it to the rod bearings. Sounds like you are right it is probably the rod bearings but the crankshaft may be damaged as well. You won't know that till you drop the pan good luck with it
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Old 11-07-2010, 10:39 PM   #25
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That clip doesn't sound good at all. Good luck with that.
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Old 11-07-2010, 11:00 PM   #26
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That clip doesn't sound good at all. Good luck with that.
X2^, oh and one more thing Mortalis, IF that is a real picture of you, will you marry me?
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Old 11-07-2010, 11:09 PM   #27
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X2^, oh and one more thing Mortalis, IF that is a real picture of you, will you marry me?
Here you go: Google Image Result for http://www.wallpaperbase.com/wallpapers/celebs/stacykeibler/stacy_keibler_43.jpg
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Old 11-08-2010, 01:22 AM   #28
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exactamundo

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Every 4.0 i have owned or herd sounds like a diesel. But anyway i have herd of people putting ATF in there oil for a very short amount of time( like under 100 miles) ans it cleans the inside of the motor.Then they flush it out and put in new oil and filter.

Ditto on the ATF. I have done this. (albeit modified)

I bought my first XJ which had been sitting behind a barn undriven for like 3 years. It had 90k on it. Jumped it and drove it ~35 miles home. Lifters chattering the whole way.

Got it home, dropped the oil plug and out came muddy kitty litter. I'm not joking. My old man took one look at it and said, "boy, you got ripped off." (I was 18.) He thought it had NEVER had an oil change in its life. So he tells me to try the ATF fix. I ran ATF and a new filter for about 300 light miles, drained it, replaced the filter, ran 5W30 for about 1000 miles, then another oil change. After that, no more diesel sound.

And oh, BTW, I ended up getting another 100k on that thing and never changed another thing on it except oil every 3-4, a water pump at around 130k and plugs/wires maybe 1 more time before I gave it to my little sister. (she wrecked it....sigh.)
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Old 11-08-2010, 11:38 AM   #29
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Just ordered an ATK engine...

It'll take about 7-10 days to get here from TX, and a local shop is intalling it (they're a certified Jasper engine installer). Only $750 labor, $289 for the parts kit. As long as I get the core charge back I'm looking at a total of $3100-ish.

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Old 11-08-2010, 11:46 AM   #30
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Very nice, but your still dodging the marriage question....
And according to wikipedia, this chick is a pro wrestler....

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