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Unread 07-08-2007, 04:56 PM   #1
mattmosman
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Jeep Engine Burning Oil?

I have a 79 CJ7 with an AMC 360 motor in it. The problem I am having is it seems like I am having to fill it up with two quarts of oil every week when the oil pressure gauge barely reads and the oil dipstick barely shows a trace of oil . I didn't know if this was normal for this type of engine or not or if I should be looking at something else? It has it's usual leaks but nothing that should drain the thing in two weeks. I take it out to play every weekend but it isn't like I am excessively hard on it. Any suggestions on where to start or is this just normal for the engine type?

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Unread 07-08-2007, 05:47 PM   #2
bdmonist
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2 quarts a week is a lot of oil. You're either leaking it or burning it, either way you need to find the problem and try to get it fixed.

Before I replaced my 360, I was leaking about 1.5 quart a month, and had some pretty good leaks, and it smoked like hell too.
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Unread 07-08-2007, 07:32 PM   #3
kavephish
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Quote:
Originally Posted by bdmonist
2 quarts a week is a lot of oil. You're either leaking it or burning it, either way you need to find the problem and try to get it fixed.

Before I replaced my 360, I was leaking about 1.5 quart a month, and had some pretty good leaks, and it smoked like hell too.
X2....there has to be some evidence of where it is going........
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Unread 07-08-2007, 08:13 PM   #4
Trapshooter
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I have to agree with kavephish. The question is if the leak is static or dynamic.

What does the ground look like where you park? Is the engine leaking sitting in the driveway or only when its running?


If you are not seeing any blue smoke, take a look at the back of your rig. If you see oilly spots on the back you have a leak.

Good luck......
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Unread 07-08-2007, 09:18 PM   #5
JarWithLid
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Wow, two quarts / week? Well, if you're burning oil that fast, you're going to see blue smoke and smell something delicious. If you're leaking that fast, it should be easy to find. Get under your jeep and wipe down everything with a rag. Drive it around for a day or two and look to see where the leaking oil is populating, trace that back to the source.

Dude, two quarts a week is a lot.
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Unread 07-08-2007, 09:25 PM   #6
mattmosman
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defintely does not smoke at all. Also.....about 2 quarts every two weeks; not every week like mentioned before. I leave it parked in the garage on the cement floor and there are a few little drips as you would expect from a Jeep but nothing that would explain going through 2 quarts. I have crawled under it and looked all over and cannot really see anything out of the ordinary. Would it be possible (as mentioned) it is only leaking when driving...if so where would be a good place to start looking?
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Unread 07-08-2007, 10:06 PM   #7
JarWithLid
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Get under your jeep and wipe down everything with a rag.

So it's clean. So no oil is anywhere.

Drive it around for a day or two and look to see where the leaking oil is populating, trace that back to the source.

You're going to have to get dirty and rock a flashlight.
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Unread 07-09-2007, 03:37 AM   #8
Fropleyqk
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My 304 was leaking from the oil pan. Thin g is that itd only leak under pressure so at idle there was nothing. It was dripping from the front half moon so there was almost no sign of a leak. Can be tricky sometimes. Theres also that flourescent dye you can put in the oil to help find the leak. Any auto parts store should have it.
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Unread 07-09-2007, 07:39 AM   #9
diamatron
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Can Timing effect burning oil at all. I am messing around with my timing lately trying to get my 304 to start easier. And it seems the more I retard the timing the more Oil i tend to burn.
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Unread 07-09-2007, 08:42 AM   #10
twmattox
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Clean the engine with some degreaser at the local car wash. You should then be better able to find leaks. IIRC there is a dye you can add to your engine oil that will make it glow under a black light...
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Unread 07-09-2007, 10:44 AM   #11
JarWithLid
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Quote:
Originally Posted by diamatron
Can Timing effect burning oil at all. I am messing around with my timing lately trying to get my 304 to start easier. And it seems the more I retard the timing the more Oil i tend to burn.
Not really. Burning oil means you are leaking oil into the combustion chamber(s) and it is igniting with your fuel. Timing adjusts at what point of your piston stroke the spark plug sparks, igniting gas.
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Unread 07-09-2007, 03:01 PM   #12
jakemary
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rear main seal is my guess. there fun i did the one on my 77 cj-7 304
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Unread 07-09-2007, 05:18 PM   #13
chromegrille
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what oil are you using, muti-grade ?
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Unread 07-10-2007, 10:16 AM   #14
mattmosman
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shell 5w-30
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Unread 07-10-2007, 02:44 PM   #15
evil-ant
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no smoke?, I guess your lucky, even when I get oil leaking out of a oil fill cap, it tends to somehow find it's way down on to the exhaust or something hot and burn, if it's leaking under load and not idle, you should degrease the entire engine and do a drive with it, if nothing shows, go and get a bilge diper, they sell them at many auto and marine part stores, it is designed to soak up oil in the bilge of the boat. zip-tie it under the engine and go for a ride. If it leaked then it will catch it and show from where. If that doesn't do it, let it cool and open the radiator cap, oily?, bad head gasket possibly
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