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| PCV Valve; can a clogged one Really blow a seal? | |
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| Tweet Topic Started: Jan 24 2013, 03:29 PM (3,322 Views) | |
| rmcelwee | Jan 25 2013, 03:23 AM Post #16 |
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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 | Jan 25 2013, 11:36 AM Post #17 |
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Basic GearHead
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I agree. 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. 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. 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. Cleaning the Y-Tube, Air Cleaner passages, and PCV (or just replace it) needs to be a larger part of our preventative maintenance schedule. Including me.
A recipe for condensation build up! Major schmuts factory! That reminds me…… .I need to take the long way home, tonight, to burn off some contaminants. |
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| Shinrin | Jan 25 2013, 02:11 PM Post #18 |
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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 | Jan 25 2013, 02:38 PM Post #19 |
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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.
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| Pilot-Terry | Apr 28 2014, 01:26 PM Post #20 |
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Advanced Member
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Man - DID I PUSH THIS IN TOO FAR ? BEFORE INSTALLING CAM SEAL - AND AFTER SOLVENT CLEANING OF AREA ![]() AFTER INSTALLING CAM SEAL - NOTE: rtv black - very thin layer used on the outside surface ![]() ![]() ![]() Edited by Pilot-Terry, Apr 28 2014, 01:27 PM.
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| Memphis metro | Apr 28 2014, 01:28 PM Post #21 |
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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 | Apr 28 2014, 02:20 PM Post #22 |
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Basic GearHead
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Really Doc? Isn't the oil drain going to be blocked? ![]() http://geometroforum.com/topic/5053891/1/ Why wait until we have a problem. Seals are cheap. Pull it out and make it flush.
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| Memphis metro | Apr 28 2014, 02:39 PM Post #23 |
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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 | Apr 28 2014, 02:56 PM Post #24 |
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Advanced Member
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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 | Apr 28 2014, 02:59 PM Post #25 |
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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 | Apr 28 2014, 10:59 PM Post #26 |
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Advanced Member
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10-4, thanks |
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| yummybacon | May 2 2014, 10:44 PM Post #27 |
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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 | May 3 2014, 06:35 AM Post #28 |
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Old Fart w/Wrenches
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FTFY, heymish....
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| charlesdefilippis | May 20 2014, 02:46 PM Post #29 |
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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 | May 20 2014, 02:54 PM Post #30 |
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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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Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.

The cool whip collapses and freezes. Then next start up, major pressure build and adios seal.



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.
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.
Including me.
Major schmuts factory!



![]](http://z3.ifrm.com/static/1/pip_r.png)





Pull it out and make it flush.

7:58 PM Jul 10