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Jeep Wrangler YJ
YJ General Discussion
Oil Leak and Oil Pressure
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<blockquote data-quote="Gilaguy23" data-source="post: 430921" data-attributes="member: 19498"><p>There is no "PCV" valve actually. Although Im talking about my 4 cyl in my 91 and I think the 4.0's are the same. So, Its a open passage in a brass fitting that screws into the valve cover. That small plastic line making its way to the intake is the line the vacuum comes from. I for one often clean out the passage with a small wire or drill bit that something like 3/32" The orifice is pretty small and you dont want to drill it out bigger, just clear it out. I also blow out that plastic line from the VC to the intake with my air compressor as it gets clogged up with junk. Prior to doing this I would get oil weeping from the oil fil cap and probably the V cover before I changed the gasket. </p><p> Far as oil loss goes consider your adding 1/2 qu or so to fill it back up to full. Thats a lot of oil to leak every few days but only you know how bad that leak is but Id think you'd have pretty big puddles under the thing every time its parked from the oil dripping off the trans and back of the engine. The gauge.....Cant say mine is any different. Used to work correctly then went to pegged to reading right then not its pegged when ever the key is on or its running at any rpm. One of these days I'll track down the bad ground or just install a after market oil and volt gauge. </p><p> The compression, well yes, thats not great. Generally its a case of percent of difference between all of the holes. In your case its just #6 thats out wack. Hard to say why its low on compression but it is the rear where it is hotter and perhaps in its other life just neglected on oil changes etc. With regard to Flyers question, no, a bad PCV valve would not cause oil to sit in the head and cause cavitation of the oil pump. </p><p> Oh and that auto trans....I used to be a Id NEVER own a auto dude, but anymore Id take an auto over a stick in a 4x4. You can set up an auto to be pretty indestructible anymore. Better for 2 foot driving in the rocks and easier on the drive train with its fluid cushioning.</p></blockquote><p></p>
[QUOTE="Gilaguy23, post: 430921, member: 19498"] There is no "PCV" valve actually. Although Im talking about my 4 cyl in my 91 and I think the 4.0's are the same. So, Its a open passage in a brass fitting that screws into the valve cover. That small plastic line making its way to the intake is the line the vacuum comes from. I for one often clean out the passage with a small wire or drill bit that something like 3/32" The orifice is pretty small and you dont want to drill it out bigger, just clear it out. I also blow out that plastic line from the VC to the intake with my air compressor as it gets clogged up with junk. Prior to doing this I would get oil weeping from the oil fil cap and probably the V cover before I changed the gasket. Far as oil loss goes consider your adding 1/2 qu or so to fill it back up to full. Thats a lot of oil to leak every few days but only you know how bad that leak is but Id think you'd have pretty big puddles under the thing every time its parked from the oil dripping off the trans and back of the engine. The gauge.....Cant say mine is any different. Used to work correctly then went to pegged to reading right then not its pegged when ever the key is on or its running at any rpm. One of these days I'll track down the bad ground or just install a after market oil and volt gauge. The compression, well yes, thats not great. Generally its a case of percent of difference between all of the holes. In your case its just #6 thats out wack. Hard to say why its low on compression but it is the rear where it is hotter and perhaps in its other life just neglected on oil changes etc. With regard to Flyers question, no, a bad PCV valve would not cause oil to sit in the head and cause cavitation of the oil pump. Oh and that auto trans....I used to be a Id NEVER own a auto dude, but anymore Id take an auto over a stick in a 4x4. You can set up an auto to be pretty indestructible anymore. Better for 2 foot driving in the rocks and easier on the drive train with its fluid cushioning. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Oil Leak and Oil Pressure
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