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Oil pressure in crank case

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Old 11-04-2015, 09:16 PM
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Default Oil pressure in crank case

Why does my 91 cherokee 4.0 have alot of pressure in my crank case causing jeep to leak oil... What could be the cause and how can it be fixed
Old 11-04-2015, 11:33 PM
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Make sure the tubes coming out of the valve cover are free of obstructions.

Otherwise, you just may have an aging engine with leaky gaskets.

Or you could have worn rings, scored cylinder walls, or a broken/cracked piston(s).

Last edited by Firestorm500; 11-05-2015 at 09:27 AM.
Old 11-05-2015, 09:24 AM
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A stuck/bad PCV valve can cause pressure to build up. Does it run rough at all? Is there enough pressure to push the dipstick out?
Old 11-05-2015, 09:25 AM
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These don't have PCV valves.
Old 11-05-2015, 09:30 AM
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Yep, should have read the year of his Jeep first. The early 4.0's just had vents right? CCV?
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