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PCV Valve; can a clogged one Really blow a seal?
Topic Started: Jan 24 2013, 03:29 PM (3,322 Views)
rmcelwee
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snowfish
Jan 24 2013, 05:36 PM
But it wasn't the PCV's fault, eh? The hose itself was full of crud.

This didn't happen when the temperature was below freezing, was it? :hmm

Looks like a bunch of moisture mixed with a little oil. :news The cool whip collapses and freezes. Then next start up, major pressure build and adios seal. :die
My only point was that you could not depend on the vent hose to be your backup.

No, it was not below freezing. It was in January but we don't get that cold here. Most of my neighbors have their outside hoses running tonight because it is supposed to get down to a bone chilling 30 degrees tonight. They are calling for a high of 80 in a couple of days!
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snowfish
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Basic GearHead

Quote:
 
not depend on the vent hose to be your backup.

I agree. ^o) The vent hose is actually the main vent. The PCV is more of the backup, so to speak. And not a very good one at that. :shake

Our crankcase ventilation system is a blend of CCV (constant crankcase ventilation. Like the 4.0 Jeeps) and PCV (positive crankcase ventilation)

The "Constant Vent" part is the tube portion that attaches directly from the valve cover to the air cleaner housing.

The "Positive Vent" part is the "Y" leg connected to the intake with the pcv.

With the PCV being a one way valve, with a very small orifice, anything other than vapor is sure to cause problems. :banghead Then it's just the "constant" part doing the venting. The hose, and air cleaner vents fill up with schmuts and the potential for crankcase pressure exists. :die

Cleaning the Y-Tube, Air Cleaner passages, and PCV (or just replace it) needs to be a larger part of our preventative maintenance schedule. :gamerz Including me. :'(
Quote:
 
30 degrees tonight. They are calling for a high of 80 in a couple of days

A recipe for condensation build up! :smackface Major schmuts factory! :die That reminds me…… :hmm .I need to take the long way home, tonight, to burn off some contaminants. :drivin :thumb
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Shinrin
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Here's the trick with the pcv.

Neglected, the pcv becomes blocked up. Over time this blockage starts filling up the Ytube. Once the Ytube is blocked, there you go, nowhere to vent.
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Tinker1980
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When I got my metro the PCV valve was broken off, just the tube hanging from the air cleaner and valve cover... filled the air cleaner up. The broken piece inside the bottom of the y-tube was clogged solid as well.

I replaced the cam and crank seals when the water pump was off, but they weren't popped out. Hopefully they haven't popped out since then. :scared
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Pilot-Terry
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Geo Glenn
Jan 24 2013, 05:41 PM


Also, the unmolested engines that I have seen do not have the camshaft seal pushed all the way in against the machined surface. A little attention to detail goes a long way.

Man - DID I PUSH THIS IN TOO FAR ? :-/

BEFORE INSTALLING CAM SEAL - AND AFTER SOLVENT CLEANING OF AREA

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AFTER INSTALLING CAM SEAL - NOTE: rtv black - very thin layer used on the outside surface

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Edited by Pilot-Terry, Apr 28 2014, 01:27 PM.
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Memphis metro


Yes, you pushed it too far. It should be flush with the outter housing. If you have no issues, do not worry about it.
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snowfish
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Basic GearHead

Quote:
 
If you have no issues, do not worry about it

Really Doc? :smackface Isn't the oil drain going to be blocked? :news

Posted Image

http://geometroforum.com/topic/5053891/1/

Why wait until we have a problem. :'( Seals are cheap. :deal Pull it out and make it flush. :thumb
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Memphis metro


Pressure will likely push it off just enough and unblock it and allow oil to flow. If the car runs with it like it then there is nothing to worry about. Oil is getting back across the other side thru the journal or some way. As long as it does not leak, I would not worry about it. If the cam cap mod was done that I do then no worries anyway. Plenty of gap for oil flow.
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Pilot-Terry
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Thanks BR, Snowfish,
A couple hundred miles - no leaks - but yep, they're cheap - next time in there or the first sign of a leak I'll replace it.
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Memphis metro


No reason really for a new seal. If it comes out, just make sure the relief groove is not blocked with rtv and do not install it so deep but only flush with the outter housing. Reuse that seal. The seal itself is not bad.
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Pilot-Terry
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Big Rhino
Apr 28 2014, 02:59 PM
No reason really for a new seal. If it comes out, just make sure the relief groove is not blocked with rtv and do not install it so deep but only flush with the outter housing. Reuse that seal. The seal itself is not bad.
10-4, thanks
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yummybacon


Big Rhino
Jan 24 2013, 04:18 PM
The two that blew out on me on two differant engines had new pcv valves and the relief ports were not restricted with rtv. :smackface Where does that leave us?




.
I had a cam seal that would not stay put,the problem was the cam cap bolts were stretched,I bought all thread and cut it down to size and used new nuts.It seems to have worked.
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davegran
Old Fart w/Wrenches

snowfish
Jan 25 2013, 11:36 AM
Quote:
 
not depend on the vent hose to be your backup.
.... The hose, and air cleaner vents fill up with schmuts schmutz and the potential for crankcase pressure exists. :die
....
A recipe for condensation build up! :smackface Major schmuts schmutz factory! :die That reminds me…… :hmm .I need to take the long way home, tonight, to burn off some contaminants. :drivin :thumb
FTFY, heymish.... :type
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charlesdefilippis
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geo shmobber
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How do i clean the pcv safely, i have a 94 with "upgraded emissions" the screws are SUPERR TIGHT, any secret ways to unscrew it, or can i clean it while shes still on the manifold
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idmetro
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The screws on all of them I have touched were super tight. I do not think you would get a good cleaning job if left in the manifold. I don't even fight it anymore, I get a pair of vise-grips and latch onto them, break them loose and then replace them with allen head screws. Good Luck!
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