Powerhouse Posted January 14, 2009 Report Posted January 14, 2009 I replaced the valve cover/push rod cover gaskets las night...due to a leak I've had for a while. All worked out nicely. Parts from NAPA...under $10. I tested for leaks...nothing...very clean and nice. Parked my car at work this morning. Looked under the car at the cement....OIL, OIL OIL and more OIL! NOT form the valve cover gaskets...but out of the dipstick hole. I recently put a PCV thing on my car...and yesterday I put a new oil breather cap...it's full of a foam type filter and sealed all around except for an inlet tube on the side. I blew through it and it seems pretty hard to blow through. But why would that make oil come out the dipstick hole? I'm so dang drained by this stupid car...but that's part of the fun...right...right???? Hahaha.... <img src="http://img.auctiva.com/imgdata/5/6/5/7/9/2/webimg/139764177_o.jpg"html> Quote
BobT-47P15 Posted January 14, 2009 Report Posted January 14, 2009 Must be too much pressure from some part of that pcv installation. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 i'm guessing it's the oil breather cap...its full of foam...hard to get air through. How would that make pressure to blow oil out the dipstick hole? Really puzzling me... Quote
p10plymouth Posted January 14, 2009 Report Posted January 14, 2009 Did you have this type of leak before you replaced the valve cover gaskets? Did you when replace the gaskets try to scoop out some of the slug? if you did you might have the tube port oping plugged with sludge.. Which will build a lot of pressure as you have... I would take the rear valve cover off the one next to the firewall.. and make sure it is open and sludge free.. Good-Luck ..DANiel Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 YEP..I cleaned out all that sludge...it was so much fun... which hole is the tube port oping ...is it a rectangular hole about an inch long? I didn't have any leaks except for the ones out the valve cover gaskets... With the new foam filled oil breather cap on I observed some bubbling coming through between the dipstick cover and the dipstick when I accelerate the engine rpms. With the cap off....NO bubbling.... Quote
Merle Coggins Posted January 14, 2009 Report Posted January 14, 2009 It sounds like your PCV system isn't evacuating the crankcase gasses and you're building up too much crankcase pressure. By leaving your fill cap/breather off you are allowing for the pressure to escape. With the cap in place the pressure is trying to escape through the dipstick tube. I suggest rechecking your PCV system again, or replacing the original draft tube again to test things. Merle Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 yeah... that's got to be it....what could be wrong in the pcv system...maybe the pcv valve is not working correctly. Can the pcv valve be clarified for me.... it opens when....it closes when? I'm too confused! Quote
greg g Posted January 14, 2009 Report Posted January 14, 2009 is your valve installed backwards. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 could be...I installed it so when you suck on the pcv it closes...so when the vacuum from the intake sucks on the pcv it closes...is that wrong???? Quote
Niel Hoback Posted January 14, 2009 Report Posted January 14, 2009 IMHO, You have more of a ring blow-by problem than a pcv problem. No crankcase should have that much pressure in it. That may have been the cause of your tappet cover leaks in the first place, along with all the odor you experienced. If you plug the breather pipe with a dense filter and don't have a pcv valve with enough capacity to pull all that blow-by out, you're gonna have some serious presure build up in the crankcase. Again, IMHO. Quote
greg g Posted January 14, 2009 Report Posted January 14, 2009 So if you suck on it and it closes, why would it open when the vacuum replaces the sucker???? I believe you want it open at "Normal Vacuum" Idle or cruise. Quote
billwillard Posted January 14, 2009 Report Posted January 14, 2009 vac pulls it open and gasses out of engine. You have it backwards. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 DOH!.... It seems like I always get the 50/50 questions on the wrong 50.... SO... engine off= wide open pcv valve idle= mostly closed pcv valve more throttle= opens pcv more +more flow full throttle= NO vacuum + no flow unless it is sucked through the filler tube back into the air cleaner of the carb. CORRECT? Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 vac pulls it open and gasses out of engine. You have it backwards. but...if the pcv should be almost closed at idle (high suction) why would it be backwards the way I have it? I have it so when you suck on the end that goes to the intake it closes. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 according to this... http://en.wikipedia.org/wiki/PCV_valve An internal restrictor (generally a cone or ball) is held in "normal" (engine off, zero vacuum) position with a light spring, exposing the full size of the PCV opening to the intake manifold. With the engine running, the tapered end of the cone is drawn towards the opening in the PCV valve, restricting the opening proportionate to the level of engine vacuum vs. spring tension. At idle, the intake manifold vacuum is near maximum. It is at this time the least amount of blow by is actually occurring, so the PCV valve provides the largest amount of (but not complete) restriction. As engine load increases, vacuum on the valve decreases proportionally and blow by increases proportionally. Sensing a lower level of vacuum, the spring returns the cone to the "open" position to allow more air flow. At full throttle, there is nearly zero vacuum. At this point the PCV valve is nearly useless, and most combustion gases escape via the "breather tube" where they are then drawn in to the engine's intake manifold anyway. [edit] I have it right.... Quote
greg g Posted January 14, 2009 Report Posted January 14, 2009 If its correct oil should not be comig out the dipstick assumong the correct amount of oil in the crankcase. Guess I will stay with the road draft tube it works as designed. Quote
moparjack44 Posted January 14, 2009 Report Posted January 14, 2009 Change it and see what happens. If I remember correctly, it's just a matter of unplugging the PCV valve and turning it around. Takes only a couple of minutes. Jack Quote
BobT-47P15 Posted January 14, 2009 Report Posted January 14, 2009 That would definitely be the simplest...easiest test. Then.....go from there. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 yeah...I guess that's worth a try. I just disconected the hose after the pcv ..I sucked in from the intake side..just like intake is supposed to...pcv's in the right direction...sucks closed....drops open without suction. Gee... that tasted great too...in 72 degree weather it was even more pleasant. I could just remember how much fun it was doing crap like this in 20 degree weather about this time of year. Quote
Don Coatney Posted January 14, 2009 Report Posted January 14, 2009 As Neil pointed out a PCV system will not fix an engine with too much blow-by. Fix the blow-by problem first. With no PCV system in place you should be able to remove the oil fill cap and see nothing. If you place the palm of your hand covering the oil fill tube you should not feel any pulsating. If you feel pulsating your engine is not healthy and in need of a rebuild. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 no pulsating or anything...I hel my hand over it and nothing.... when I run the engine at idle...no oil pours out. Even after I parked it this morning....I turned the engine on again to see if it would leak again. Nothing. Oil dipstick read as 3/4 full Quote
Don Coatney Posted January 14, 2009 Report Posted January 14, 2009 no pulsating or anything...I hel my hand over it and nothing.... You did this in less than 2 minutes? Time between my posting and your response.... Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 nope...I did it about ten minutes ago..on lunch break... Quote
cwcars88 Posted January 14, 2009 Report Posted January 14, 2009 I agree with Niel, to much pressure. As I see this no matter which way you have the valve, right or wrong, if you don't have a non restricted air flow coming in you will build pressure. If the valve is opened by pressure it might push the valve open but if the valve is opened by vacuum, that you don't have it will build pressure. Try sucking on a bottle and see how much air you move, that what you have if the air can not get in a closed chamber. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 AH...I think i might understand what you're saying... The suction from the intake in combination with the very restrictive oil filler cap is causing high pressure. Which makes the oil escape from the nearest hole. Why wouldn't the air come in that hole instead of force oil out? Wierd. Quote
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