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Author Topic: Need help again. Water in YJ 2.5 oil.  (Read 2904 times)

Offline Twisty

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Need help again. Water in YJ 2.5 oil.
« on: February 03, 2015, 05:26:14 PM »
I'm trying to track down a possible source for water in the engine oil of my mother's 2.5 YJ. 

Quick history-  Parked in 2012 because it needed a new radiator and other various parts.  I picked away at it slowly, and finally got it on the road again this past November/December. 

I checked the oil a week ago and noticed that there was a white smear near the top of the "full" notch.  I immediately changed the oil and filter.  I drained the oil overnight, filled with some 10w30 that I had kicking around and let it idle for 30 mins.  After that I changed the oil again with 10w40 and a new filter.  During neither of the drainage periods did the oil appear to be contaminated with water.  It was not milky colored.  Today I check the oil again and the same white smear appears on the dipstick.  This new oil is less than 10 miles old.

My theory was condensation in the engine because the t-stat wasn't working correctly for a few weeks and the engine would only get to 150*.  I replaced the t-stat too, and it seems to be working better.  But since I'm still seeing evidence of water, I'm a bit more perturbed.

I am concerned about the head gasket, so I ran a compression test and my results were 160-170-170-180.  Not too shabby for a 180k+ engine.   I took the radiator cap off and started the engine.  It didn't come out like a geyser (like I've read it would), but the level slowly rose and stopped at the top of the radiator fill spout.  The spark plugs looked ok; they are a little worn and the gap is pretty big.  I do not have a cat on the Jeep, so the exhaust doesn't smell "normal," but it doesn't smell sweet either....it smells like exhaust.


Should I run it to get it good and hot to try to burn off any condensation?  Should I change the oil again?  What else can I do to diagnose this thing?  It's needed this time of year so I'd like to have it down for as little time as possible.
« Last Edit: February 03, 2015, 05:39:43 PM by Twisty »
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline Posimoto

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #1 on: February 03, 2015, 05:57:51 PM »
Sounds like condensation to me. Make sure the PCV system is working properly and take it out for a long drive. 

Edit, no on the oil change.
« Last Edit: February 03, 2015, 05:59:37 PM by Posimoto »
"That's the trouble with research on the internet, there's no way of verifying its truth" --Ulysses S. Grant

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from/garaged CO)

Offline Twisty

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #2 on: February 03, 2015, 07:43:23 PM »
So I pulled an oil sample.  Not good.  I'm uploading some pics now and I will post them when they are done.
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline Twisty

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #3 on: February 03, 2015, 09:27:40 PM »
I think that this is more than just condensation.   >:(


I do not know what to do next.  How do I determine if it's a block issue or a head gasket issue?
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline Casey L

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #4 on: February 03, 2015, 10:27:45 PM »
I would just run it until it blows up. Possibly put some of that leakseal/head gasket repair additive in the coolant.

If I wanted to keep the YJ, I would buy this.

http://newlondon.craigslist.org/pts/4836654715.html


Offline Corey G.

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #5 on: February 03, 2015, 10:41:31 PM »
Do a leakdown test... air will come out the radiator cap if it's the HG's.

Also check the coolant for signs of oil.
« Last Edit: February 03, 2015, 10:47:08 PM by Corey G. »
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Offline jps4jeep

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #6 on: February 04, 2015, 07:13:55 AM »
Are there coolant jackets from the block to the intake on the 2.5? could have a low pressure leak from the intake into the block?
I'm kinda with Casey, might be cheaper and easier in the long run to just buy a new motor.  Investigate and posible rebuld the old motor as time passes and then try to sell or keep as a spare.
Dad always said "If it has boobs or spark plugs it will be fun AND will cause you problems."

Offline Posimoto

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #7 on: February 04, 2015, 08:00:41 AM »
  After that I changed the oil again with 10w40 and a new filter.  During neither of the drainage periods did the oil appear to be contaminated with water.  It was not milky colored. 

What was done differently, if anything, from then til now?
"That's the trouble with research on the internet, there's no way of verifying its truth" --Ulysses S. Grant

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from/garaged CO)

Offline Ian

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #8 on: February 04, 2015, 09:59:06 AM »
your oil looks like an ice coffee
i am an AMSOIL dealer! pm me for a quote

60 w/ minor bling 4.56, 14b ff rear w/detriot 4.56, atlas 2speed 5.0 4 custom link rear and 3link front, 110" wheelbase, pcs full hydro, fox 2.5's,  and 42" Irok stikies... and no clue

'00 tj (see above)

Offline Twisty

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #9 on: February 04, 2015, 11:17:55 AM »
  After that I changed the oil again with 10w40 and a new filter.  During neither of the drainage periods did the oil appear to be contaminated with water.  It was not milky colored. 

What was done differently, if anything, from then til now?

Monday Jan 26: Drained oil, filled with cheap 10w30 and ran for 30 mins to wash out the insides.  Drained oil, filled with 4 quarts of 10w40 and a new filter.

Thursday Jan 29: Replaced t-stat with a new one from Autozone. 

Tuesday Feb 3: Checked oil again, and took picture above. 


One day I drove to the craft beer store and another I drove to the hardware store (both in the center of my town, about 3 miles away).  Other than a couple trips up the road to check on a neighbor and moving around the driveway for snow blowing it has not seen any road time in a week.  At this point I'm feeling that the amount of water to make the oil look like this, in my feeling, is more than just condensation. 


I do not have a leak down tester, but I can pressurize individual cylinders with the hose on my compression tester. 
« Last Edit: February 04, 2015, 11:19:12 AM by Twisty »
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline Twisty

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #10 on: February 04, 2015, 11:52:47 AM »
I would just run it until it blows up. Possibly put some of that leakseal/head gasket repair additive in the coolant.

If I wanted to keep the YJ, I would buy this.

http://newlondon.craigslist.org/pts/4836654715.html



Def going to keep the YJ.  I just finished a "frame on" resto.  It's got a lot of new parts and drives awesome!  I'm rather attached to it.


Thanks for the link.  I'm going to call him about the engine.
« Last Edit: February 04, 2015, 11:53:09 AM by Twisty »
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline SPYDER

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #11 on: February 04, 2015, 11:56:48 AM »
sounds like a possible blown head gasket
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Offline Posimoto

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #12 on: February 04, 2015, 01:45:02 PM »
I was just wondering what changed from not having antifreeze in the motor to now seeing it. Regardless you have a good leak, use some compressed air it will tell you more then a compression test. Without the gauge you'll have to listen for change with each cylinder. Remember to put the piston at TDC.
"That's the trouble with research on the internet, there's no way of verifying its truth" --Ulysses S. Grant

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from/garaged CO)

Offline Twisty

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #13 on: February 04, 2015, 04:00:53 PM »
Quick update.  I took a sample to Elias and had jeeptech look at it.  He says that the oil does not have water in it.  It seems to be gas.  Oil is too thin and smells like fuel.  He also suspects that the oil smells like exhaust...I need to do a compression test again.
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline Posimoto

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Re: Need help again. Water in YJ 2.5 oil.
« Reply #14 on: February 04, 2015, 04:35:11 PM »
Does the engine typically fire up when you turn the key or does it take some cranking? Was there a recent time when it wouldn't start and you had to crank extensively? Are all cylinders firing?
"That's the trouble with research on the internet, there's no way of verifying its truth" --Ulysses S. Grant

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from/garaged CO)


 



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