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Unread 06-11-2006, 11:53 PM   #1
MayorMcCheese
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Oil consumption problem... where to start??

So it seems that I have a slight oil consumption problem.

I seem to be averaging about 1 qt. loss per week or so. About 3 weeks ago it was in at the garage and I had them replace the valve cover and gasket because the valve cover was cracked and it appeared to be leaking oil. Fast forward to last week and I notice that the oil pressure has dropped and that my "diesel ticking" had gotten a little louder, checked the oil and sure it enough it was 3 qts. low!!! And I'm not dripping on the driveway anywhere.

So for now it has some 20w-50 in it and my normal ticking is a lot quieter and the engine seems to be running better then ever. I would think that my obvious first step is to check the valve cover gasket out and see that it was replaced correctly, but after that what is next?

If I was burning almost a quart every week, then wouldn't the exhaust be pretty black?

Sorry for the long post, but I wanted to give as much info as possible to get a good lead on where to start.

TIA

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-Evan (YJ noob)

1990 YJ 2.5L
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Unread 06-12-2006, 12:26 AM   #2
mp3coupe
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Is the ground underneath the jeep dry now? If yes then your burning it.
How many miles are on it?
Pull the plugs and see if they're black.

What oil on a plug looks like
http://www.classictruckshop.com/club...park/plugs.htm

edit
A quart a week!!! How many miles are you doing a week? Are you pulling high R's?
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Unread 06-12-2006, 12:35 AM   #3
MayorMcCheese
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Quote:
Originally Posted by mp3coupe
Is the ground underneath the jeep dry now? If yes then your burning it.
How many miles are on it?
Pull the plugs and see if they're black.

What oil on a plug looks like
http://www.classictruckshop.com/club...park/plugs.htm

edit
A quart a week!!! How many miles are you doing a week? Are you pulling high R's?
I probably do an average of about 350-400 miles per week as an estimate, maybe a little less some weeks.

There is definately some oily spots here and there around the engine bay and underneath, but I can't really tell what is new and what is old.

I'm thinking my first step may be to clean everything up really good to see what spots form after that.
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Unread 06-12-2006, 03:29 PM   #4
MayorMcCheese
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Any other suggestions about how to attack this problem?

It is possible to have an oil leak that does not drip on the ground correct?
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Unread 06-12-2006, 04:39 PM   #5
flame0086
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If you're exhaust is blue, then your engine is burning the oil. I just recently had oil leaking from the rear main seal, but I didn't notice it until I had my jeep on the drive way instead of the gravel. It was only a couple of drops, but knowing my jeep it was enough for me to get under there and see if it was something big. A few minutes later I put 3 quarts of oil in it and call up the shop that put in this new engine.
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Unread 06-12-2006, 06:18 PM   #6
MayorMcCheese
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Quote:
Originally Posted by flame0086
If you're exhaust is blue, then your engine is burning the oil. I just recently had oil leaking from the rear main seal, but I didn't notice it until I had my jeep on the drive way instead of the gravel. It was only a couple of drops, but knowing my jeep it was enough for me to get under there and see if it was something big. A few minutes later I put 3 quarts of oil in it and call up the shop that put in this new engine.
I'm going to start watching closely, but I remember when my Jetta used to burn oil and my exhaust from the Jeep looks nothing like that.
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Unread 06-13-2006, 08:17 AM   #7
vdubstreets
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take engine degreaser, clean your whole motor block and everything, then periodicly check where you see oil build up. im in the same area as you im looking for a leak and i think i found it. to the left of the distributor is where a 'mechancial fuel pump' would be so im going to replace the gasket. its about a quart every month or 2.
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Unread 06-13-2006, 08:30 AM   #8
I.O.A.MUD
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IOm having the same problem with my 1990 2.5...90000 mi. Ive cleane the motor up and can find no noticeable leaks. The exhaust is clear. The pan has a few wet spots but not near enough to account for the oil used. I tooo did a change with 20/50..this has helped some. My neat step is a compression check. any other Ideas?
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Unread 06-13-2006, 10:33 AM   #9
MayorMcCheese
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Quote:
Originally Posted by vdubstreets
take engine degreaser, clean your whole motor block and everything, then periodicly check where you see oil build up. im in the same area as you im looking for a leak and i think i found it. to the left of the distributor is where a 'mechancial fuel pump' would be so im going to replace the gasket. its about a quart every month or 2.
It's funny that you say that because one of the places that I noticed is a little oily is in that same location.
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Unread 06-13-2006, 11:02 AM   #10
vdubstreets
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Quote:
Originally Posted by MayorMcCheese
It's funny that you say that because one of the places that I noticed is a little oily is in that same location.
if you want i can show you a diagram and give you a part number for hte gasket, it was only a couple bucks offline.
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Unread 06-13-2006, 12:45 PM   #11
MayorMcCheese
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Actually I went out today and did some investigating and I think I found the source of the leak...

Of all things it appears it was a loose oil filter. It was loose enough that I hand tightened it about 1/2 turn and then got probably a full turn out of it with an oil filter wrench.

I fill her up with oil again to the "FULL" mark on the dipstick and I'm going to check it again in a couple days. I'll post back then.

BTW: I was not the one who installed the oil filter. Just so you don't all think I'm a moron.
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1990 YJ 2.5L
Stock everything... for now.
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Unread 06-16-2006, 01:29 PM   #12
MayorMcCheese
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Quote:
Originally Posted by MayorMcCheese
Actually I went out today and did some investigating and I think I found the source of the leak...

Of all things it appears it was a loose oil filter. It was loose enough that I hand tightened it about 1/2 turn and then got probably a full turn out of it with an oil filter wrench.

I fill her up with oil again to the "FULL" mark on the dipstick and I'm going to check it again in a couple days. I'll post back then.

BTW: I was not the one who installed the oil filter. Just so you don't all think I'm a moron.
UPDATE: Sadly, it looks as though that was not the problem since I have leaked probably a 1/8 qt. since Tuesday for about 80 miles of driving.

Oh well, next week it goes back to the garage I guess to try and figure out this leak.
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Stock everything... for now.
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Unread 10-23-2013, 10:35 PM   #13
Swampeast2
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I think mine is leaking at the valve stem seals, but how can I be sure? I've got an 1987 YJ with a 1990 2.5 L. Is it better money to just rebuild the head?
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