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Old 10-31-2016, 11:51 AM
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New YJ oil leak

Hello! I'm a new guy and a college kid from Michigan. I recently traded my XJ for a YJ. It has the 2.5.. oops. It doesmt leak a ton of oil volume wise, but it sprays all over the engine bay and somehow even down by the frame. Any ideas on what to start looking at?

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Old 10-31-2016, 12:58 PM   #2
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Check you PVC valve on the valve cover to see if it is completely seated in.

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Old 10-31-2016, 01:02 PM   #3
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Sorry PCV valve.
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Old 10-31-2016, 09:41 PM   #4
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If oil is being "sprayed" then it is probably a leak near a moving part. The only thing I can think of would be the serpentine belt. If you have oil leaking out around the belt, it'll be slung everywhere. I have that issue with a coolant leak now. I would suggest degreasing the engine and finding where the leak is.

Also are you sure that it is oil? It could be coolant as I stated above. I wouldn't think that oil would "spray" that much under normal oil pressure. I have high oil pressure and it didn't even spray that much when my oil pressure gauge wasn't tight enough.
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Old 10-31-2016, 09:57 PM
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No, Im not entirely sure. It seems to be brown and greasy and oil like though. It is all over the engine bay and even under it and as far as the battery.
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Old 10-31-2016, 10:03 PM   #6
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Go to the auto parts store and get ultraviolet coolant dye. It's less than $1 an ounce. Put a bottle in through the radiator cap. You can use a UV light to see what is coolant and what is not. Don't get the stuff for AC. It is more expensive and meant to be injected into AC lines, not cooling systems.
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Old 10-31-2016, 10:11 PM   #7
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FJC 4926. $3.50 for a box of 6 bottles, 1 oz each.
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Old 11-01-2016, 12:17 AM   #8
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There are a couple places that are common.

One would be the oil pressure sender. They crack and spray all over.

The next would be the crankcase vent system being clogged and blowby forcing oil everywhere. Related to this, would be a leaking oil cap gasket, valve cover gasket, and/or vent grommets on the valve cover.
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Old 11-01-2016, 11:03 AM   #9
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Quote:
Originally Posted by MudMagnetYJ View Post
I wouldn't think that oil would "spray" that much under normal oil pressure. I have high oil pressure and it didn't even spray that much when my oil pressure gauge wasn't tight enough.
You reminded me of a funny story. Stupid kid wanted to confirm he had oil going all over where it needed to go. He removes the valve covers from his motor ( V8 ) and fires it up while standing next to fender. Oil went all over the place .... but the circumstance was different being that both valve covers were off. But it did spray the oil out over the engine compartment.


I was that stupid kid and it was a long time ago, like back in 1975.
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Old 11-01-2016, 02:01 PM
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How would I know if the crankcase vent was clogged? How would I go about fixing it?
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Old 11-01-2016, 05:48 PM   #11
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Take it off and shake it. It should rattle. If it's metal, you can soak it in a solvent for a while and then shake it until it rattles. Make sure you don't have cracked grommets or hoses.

MudMagnetYJ has a few Factory Service Manuals as links in his signature. Find one that shows your Jeep and make sure your vacuum system is plumbed correctly.

You might start by spraying a couple cans of engine cleaner around under your hood and then blasting the crud off at the quarter car wash. Be sure to cover your distributor and carb intake. Use common sense when spraying high pressure water around your electrical items and connections.

Good Luck, L.M.

Good Luck, L.M.
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Old 11-05-2016, 11:47 AM
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Here are some pics. The tranny and front pumpkin are covered in some sort of green brown oily slime.
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Old 11-05-2016, 11:48 AM
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The slime
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Old 11-05-2016, 11:49 AM
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Engine bay
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Old 11-06-2016, 10:49 AM   #15
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Quote:
Originally Posted by Luckymac View Post

You might start by spraying a couple cans of engine cleaner around under your hood and then blasting the crud off at the quarter car wash. Be sure to cover your distributor and carb intake. Use common sense when spraying high pressure water around your electrical items and connections.

STEP ONE is clearly spelled out above.

Clean/Degrease .......... then run and OBSERVE.

Look for where leaks may be.

As to the slime pic ...... no way of telling what it is by looking at a pic.

Oh and wipe that slime off your finger!

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Old 11-09-2016, 12:15 AM
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Broke down, took it to a mechanic. It's indeed ring blowby.

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